Infrared Differential Detectors: A New Paradigm Beyond the Limits of BLIP
Infrared Differential Detectors: A New Paradigm Beyond the Limits of BLIP
Infrared Differential Detectors: A New Paradigm Beyond the Limits of BLIP
Infrared Differential Detectors: A New Paradigm Beyond the Limits of BLIP
Infrared Differential Detectors: A New Paradigm Beyond the Limits of BLIP
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WANG Cheng, LI Meng-yuan, LI Chun-ling
2025,46(5):1-10
Abstract:
Monocular depth estimation plays a very important role in many applications such as 3D reconstruction, target tracking, and scene understanding. Since monocular cameras have the characteristics of low cost, widespread equipment, and convenient image acquisition, obtaining depth information from monocular images has become a hot research topic. First, the common deep learning models used for monocular depth estimation are summarized, mainly including convolutional neural network (CNN), recurrent neural network (RNN), and generative adversarial network (GAN). Then, the deep learning methods for monocular depth estimation are summarized from the perspective of training methods, and the development trend of monocular depth estimation is summarized.
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Li Zhen, Wang Dan, Jiang Meng-jia, Guan Chong-shang, Xing Wei-rong, She Wei-lin, Niu Jia-jia
2025,46(5):11-16
Abstract:
Due to the growing demand for large-scale silicon-based HgCdTe materials for large-scale HgCdTe infrared focal plane detectors, the surface macroscopic defect density of 6-in short-wave silicon-based HgCdTe materials based on molecular beam epitaxy (MBE) is studied. The surface defects of the materials are analyzed using scanning electron microscopy (SEM), and the types of defects and their causes are determined. The composition uniformity of the materials is improved by improving the uniformity of the epitaxial temperature zone, the beam uniformity, and the stability of the source furnace. The preparation technology of 6-in short-wave silicon-based HgCdTe materials based on molecular beam epitaxy is improved by controlling the surface defects of the materials and optimizing the material process parameters, and high-quality 6-in short-wave silicon-based HgCdTe materials with high uniformity and low surface defect density are mass-produced. The results show that the composition difference between the center and the edge of the material is less than or equal to 3.0%, and the surface macroscopic defect (larger than 2 μm) density is less than or equal to 70 cm-2.
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MA Teng-da, XU Sheng-xian, LI Hao-ran, SHI Hao, WANG Hui
2025,46(5):17-23
Abstract:
The backside polishing quality of silicon-based infrared devices directly affects the performance parameters of the chips, and the cleaning treatment after polishing will also affect the reliability of subsequent processes. Cleaning of particles adsorbed on the surface of materials is a hot topic in current research. The cleaning effect of anionic surfactant (sodium dodecyl sulfate (SDS)) on silicon wafer particles after silica sol polishing is explored, and the cleaning mechanism is deeply analyzed using molecular simulation methods. The results show that when the concentration of SDS is high, a bilayer adsorption morphology can be formed on the surface of SiO2 particles, and a negative charge state is presented on the outermost layer. This forms an electrostatic repulsion force with the negative charge on the surface of the silicon wafer in an acidic environment, thereby effectively cleaning the SiO2 particles.
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LI Zhenlei, RAO Qichao, HAN Penglei
2025,46(5):24-30
Abstract:
As an important component of the infrared detector assembly, the fixing method of the linear motor of the Stirling refrigerator is an important factor affecting the reliability of the assembly. If the destructive force of the magnetic steel fixing is higher than 10 kN, the risk of the magnetic steel falling off will be reduced. Therefore, the destructive force of the linear motor of the Stirling refrigerator under different magnetic steel fixing methods is studied. The test results show that in the case of pure gluing or pure welding, the maximum destructive force when the glue is fully applied and one-circle welding is used is close (about 6 kN), and there is a risk of magnetic steel falling off. In the case of combining the two methods, the destructive force when the glue is fully applied and the 6-point welding is used is 11.18 kN, which meets the requirements of magnetic steel fixing; the destructive force when one-circle welding is used is 17.02 kN, which greatly increases the reliability. The simulation data is close to the experimental results, which proves that when the glue is fully applied, the minimum welding condition to avoid the magnetic steel falling off is 6-point welding. When the welding points are less than 6, there is a risk of magnetic steel falling off, causing the refrigerator to hit the cylinder and make an abnormal noise. This result provides a reference for the reliability design of subsequent refrigerators.
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CUI Lin-li, GUO Wei, SHI Jun, CHEN Min-hao
2025,46(5):31-37
Abstract:
The satellite-derived ocean surface wind field has important indicative significance and practical value for global typhoon disaster monitoring. The wind field observation data of three ocean buoy stations of the Shanghai Meteorological Bureau and similar satellite products at home and abroad are used to test the accuracy of the wind field measurement radar (WindRAD) product of Fengyun-3E (FY-3E), and the application capability of the wind field product is evaluated in combination with three typhoons that have affected the Shanghai area during June 2022 and September 2023. The results show that FY-3E/WindRAD can better describe the basic wind circle structure characteristics of typhoons, and compared with the measured results of the buoy stations, the wind speed inversion results of FY-3E/WindRAD basically meet the accuracy requirements of operational applications. Compared with the international similar wind field inversion results, the change law of the typhoon wind circle structure information and maximum wind speed information over time has a good consistency. The research results have important reference value for the application and analysis of FY-3E/WindRAD wind field products.
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Lu Jia-jie, Zhang Xia, Hou Ze-xuan, Liao Zheng-xiong, Xue Yi-nuo, Li Meng-ge, Guo Jia-qian, Zhang-Li, Yang Jing-ting
2025,46(5):38-48
Abstract:
As an important river in Zhengding County, the water pollution situation of Hutuo River affects economic and social development and people′s quality of life. Therefore, it is particularly important to monitor the water pollution situation efficiently. Based on Sentinel-2 satellite imagery, a remote sensing inversion model of major water pollutants was constructed by integrating three indicators: chlorophyll-a concentration, suspended matter concentration, and water transparency. The spatial autocorrelation model was used to conduct dynamic remote sensing monitoring of water pollution in the Hutuo River in Zhengding County, Shijiazhuang City. The research results show that during the period from 2019 to 2023, the chlorophyll-a concentration gradually decreased, among which the chlorophyll-a concentration in the upper reaches is the highest in 2019; the area with high suspended matter concentration gradually shifted from the upper reaches to the lower reaches; the water transparency generally showed a trend of first rising and then falling; the degree of water pollution changed from upstream pollution agglomeration to mid- and lower reaches pollution agglomeration; the spatial agglomeration degree of Hutuo River in Zhengding County first decreased and then increased, and the number of highhigh agglomeration types continued to decrease, showing a significant spatial positive correlation. By selecting high-precision satellite data and integrating key water pollution indicators, the water pollution status of the Hutuo River is dynamically monitored, revealing the spatial cluster distribution characteristics of water pollution and providing a scientific basis for local water environment protection and governance.
Volume 46,2025 Issue 5
Review
Articles
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A Stirling-cooled fast start Infrared Detector
Abstract:
The integrated Stirling-cooled infrared focal plane graphics component has the characteristics of small size, low power consumption, and high reliability, and is widely recognized in various infrared complete systems. However, existing detectors hardly satisfy the strict startup-time requirements of long-range missile weapon systems for guidance-based combat. This article analyzes the factors that affect the startup time of infrared focal plane detectors and proposes a new design concept. By designing a micro - Dewar and a refrigerator drive controller while keeping the original detector’s performance and the optical, mechanical, and electrical interfaces unchanged, rapid startup is achieved. Experimental results indicate that, under this condition, a considerable reduction in cool - down time has been obtained. The cool - down time can be reduced to within 3 minutes and 30 seconds at normal temperature. This significantly improves the detector’s fast cool-down capability and meets the project requirements.
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PM2.5 signal recognition and interpretable retrieval based on satellite infrared data
WANG Gen, YUAN Song, YE Song, FAN Chuan-yu
Abstract:
Particulate matter with a diameter less than 2.5 microns (PM2.5) on the ground has a negative impact on human health and the economy. Most methods obtain PM2.5 from satellite derived aerosol optical depth (AOD) indirect products or daytime atmospheric top reflectance. The purpose of this paper is to directly use the advanced geosynchronous radiation imager (AGRI) infrared data from Fengyun-4B satellite and artificial intelligence models to retrieve PM2.5 with spatial and temporal resolution of 4 kilometers and 15 minutes in the Yangtze-Huaihe region in near-real time throughout the entire time period (including day and night). Firstly, explore the signal response of AGRI brightness temperature to different levels of PM2.5 in different seasons; Secondly, a study on AGRI brightness temperature retrieval of PM2.5 was conducted based on the random forest method in different seasons. The experimental results showed that the PM2.5 correlation coefficients obtained from the seasonal retrieval were all over 0.87; Finally, based on SHapley Additive exPlanations (SHAP), the model was interpretable and the contribution of geographic information to PM2.5 was found to be significant. And further explored the application of the products mentioned in this paper.
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Study on the solution of atmospheric transmittance based on HO-RF
Abstract:
In order to improve the efficiency and accuracy of obtaining atmospheric transmittance parameters in infrared radiation test, this study proposes an atmospheric transmittance solution model based on HO-RF algorithm. The model takes the key environmental factors such as temperature, humidity, operating distance and atmospheric pressure as input, and establishes a regression solution model based on the measured data, so as to realize the rapid and accurate solution of atmospheric transmittance. The simulation results show that compared with the traditional BP neural network and RF model, the proposed HO-RF model performs better in terms of solution accuracy. The root mean square error ( RMSE ) is reduced to 0.010745, the R2 value is 0.95877, and the mean absolute error ( MAE ) is 0.0080021. The model proposed in this study can effectively reduce the complexity of experimental operation. Compared with the traditional method, it has higher accuracy, stability and reliability, and improves the efficiency of infrared characteristic test of fighter aircraft, which has good practical application value.
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Identification and extraction of tunnel contour changes based on mobile laser scanning
XU Jian-Guo, ZHANG Kai-Kun, DUAN Wei, HE Jiang, YAO Lian-Bi
Abstract:
Accurate positioning of boundary points for complex shaped tunnel contour changes and extraction of segmented contours can provide strong support for tunnel deformation monitoring, point cloud orthophoto generation, and reconstruction of existing tunnel models. Based on high-precision tunnel point cloud data collected by mobile laser scanning, the original section point cloud is first extracted and preprocessed. Then, contour changes are identified by using contour feature point neighborhood density features. Finally, tunnel segmentation and contour extraction are completed by combining mileage positioning method and boundary extraction algorithm. The feasibility of this method was verified through experiments using measured data from a subway tunnel and a highway tunnel. Compared with existing research, the method proposed in this paper eliminates the high dependence on the tunnel axis and can autonomously and accurately identify contour changes, effectively improving processing efficiency. It provides an efficient and innovative solution for engineering applications related to complex shape tunnel segmentation and contour extraction, and has certain reference value for optimizing the application of high-performance laser scanning technology.
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Optimization Design and Application of Spaceborne Large Aperture SiC Plane Mirror
dengrong, yuanhaitao, sunxiaojin, chenfansheng, sunshengli, chenzhongming
Abstract:
An innovative design scheme based on semi-closed backplane structure was proposed to meet the requirements of lightweight and stiffness improvement of SiC planar mirror in two-dimensional pointing mechanism of space camera. The semi-closed topological configuration on the back was constructed to replace the traditional open structure, and the stiffness was improved by adjusting the size of the process hole. The finite element model was established and the three design schemes were compared. The simulation results showed that the mass of the second scheme was reduced from 12.8 kg to 10.7 kg, the first natural frequency was increased from 730 Hz to 1528 Hz, and the ratio of stiffness to mass was increased by 1.5 times. The performance index was significantly better than that of the traditional open structure (scheme 1) and the large aperture scheme (scheme 3). The optimized pointing mirror had passed the sinusoidal vibration test, and the RMS value of the surface shape accuracy was doubled from 0.073 λ to 0.036 λ (λ = 632.8 nm). The semi-closed backplane design proposed in this study breaks through the stiffness limitation of traditional lightweight structures, and provides a new method for the design of other space mirrors.
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An Intelligent Identification Method and Its Application for Downhole Fluid Types Based on Big Data in Near-infrared Spectroscopy
Kong Sun, Shen Yang, Yu Qiang, Chu Xiaodong, Bao Zhongli, Zuo Youxiang
Abstract:
Although COSL has successfully developed downhole optical spectrum analyzers, there are still shortcomings in interpretation, especially intelligent fluid identification driven by downhole spectral data in real time. In this paper, an intelligent fluid identification method driven by spectral data in real time is proposed for the first time. Firstly, based on a large number of measured spectral and fluid data, a database of various fluids is established. The spectral data and fluid types in the database are then preprocessed separately. The spectral data of 256 channels are further reduced by principal component analysis, and the first 10 principal components are chosen as input variables. Fluids are divided into 5 types (output variables): gas, oil, water, slurry (emulsified fluid, or invalid measurement), oil/gas-water mixture. Next, 23 pattern recognition models are used for modeling of fluid identification, including various trees, discriminants, support vector machines, K-nearest neighbor methods, artificial neural networks and so on. All the models are then analyzed and compared, and the best model is selected to be embedded in the formation test tool. The test accuracy of the 23 models after training is 78.1% - 99.9%. The artificial neural network is the best (accuracy of 99.9%). Finally, the spectral data from more than 40 sampling stations are employed to further examine the best model. The results show that the best model can accurately predict fluid types. The new intelligent identification method lays a solid foundation for eliminating the influence of water on the oil and gas spectra and analyzing the composition of oil and gas more accurately, thus reducing operation risks and saving operation time and costs.
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Research on emissivity compensation model of infrared thermal imager
XuZhangLi, TianHaoBin, LI Xuelei, CUI Lei, YIN Bo, ZhongYingLong
Abstract:
Infrared thermal imagers, as non-contact temperature measurement tools, have significant advantages in hot stamping processes, but their measurement accuracy is easily affected by multiple factors such as surface emissivity, observation angle, and target temperature. A temperature measurement optimization method with dynamic emissivity compensation is proposed in the article: firstly, projection measurement technology is used to accurately obtain the spatial angle parameters of complex curved parts, and the effect of observation angle and temperature values on temperature measurement deviation is quantitatively analyzed through experiments; Constructing a nonlinear mapping model between emissivity and multidimensional variables through machine learning algorithms to achieve intelligent compensation of dynamic emissivity parameters. Experimental verification shows that after compensation, the temperature measurement system error can be stably controlled within the range of ± 1.5 ℃, with an accuracy improvement of up to 60% compared to the fixed emissivity mode. This provides an effective solution for the application of high-precision infrared temperature measurement in intelligent manufacturing scenarios.
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Analysis of properties of tunneling current in the THz-STM based on the Simmons model
yujianxiong, heyulun, huangbin, liuxiang, duhaiwei
Abstract:
The coupling of ultrashort terahertz (THz) pulses into the scanning tunneling microscope (STM) technology can make this technology with high spatial-temporal resolution, so as to play a greater role in material surface imaging, performance diagnosis and testing. Based on Simmons model, the principle of THz-STM is introduced and the factors affecting the tunneling current are analyzed. The influence of THz pulse and work function of samples on the potential barrier and tunneling current are studied in detail with numerical calculations. Particularly, the relationships between THz pulse (including its duration and phase), work function of samples, and threshold of tunneling current are discussed. It is found that the tunneling current is the period function of the phase of THz pulse. There is a threshold for the coupling of the THz and DC field, which is related to the material work function. The tunneling current is the linear function of the THz field above this threshold. It will decrease with an oscillation state and then tread to stable when the duration of the THz pulse increases. This work will help understand the mechanism of THz-STM experimental setup and might offer a reference for the related experiments.
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Design and Test of Fiber-Coupled Terahertz Radiation Source
ZHANG Gui-ming, ZHU Jun-feng, DU Zhi-qinag, WU Bin, YANG Yan-zhao, CAI Gao-hang
Abstract:
Photoconductive antenna (PCA) is one of the most used terahertz (THz) radiation sources in terahertz time domain spectrometry (THz-TDS) system. In this paper, a 1560nm laser-excited fiber-coupled terahertz radiation source module is designed and simulated using InGaAs/InAlAs superlattice PCA chip based on the principle of terahertz signal generating by PCA. Through the integrated design of optical path and structure, the miniaturized terahertz radiation source is obtained. Under the excitation of femtosecond pulse laser with an average power of 25mW, pulse width of 100fs and central wavelength of 1560nm, THz signal with the spectral range of 0.1~2.9THz and the dynamic range of 57dB obtained is achieved from sampling of single waveform of terahertz radiation source. In addition, the excitation light power, the bias voltage and the relationship between the output signal amplitude of the terahertz radiation source is investigated experimentally.
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Study on the Frustum-shaped defects on the surface of HgCdTe film prepared by Liquid Phase Epitaxial growth
Yang Meihua, Xing Xiaoshuai, Yang Haiyan, Hu Yilin, Li Qian, Wang Lijun
Abstract:
In order to reduce the influence of the defects of telluride cadmium mercury (HgCdTe) thin films grown by liquid phase epitaxy (LPE) on the performance of infrared detectors, a special type of surface defects, the frustum-shaped defect, was systematically studied by means of scanning electron microscopy, energy dispersive X-ray spectrometer, focused ion beam and comparative experiments. The size of these defects ranges significantly, from approximately 150 to 400 micrometers, and under an optical microscope, they exhibit a morphology resembling a frustum with a concave center. Compositional analysis revealed no significant differences between the surface of the defect and the normal film morphology. Further analysis of the interface between the tellurium zinc cadium (CdZnTe) substrate and the HgCdTe film indicated that these penetrating defects orginate from triangular telluride inclusions with central holes on the CdZnTe substrate, and the size of tellurium inclusions is almost above 20 μm. Therefore, by improving the quality of the CdZnTe substrate and enhancing substrate screening, the frustum-shaped defects in HgCdTe films can be reduced, thereby improving the quality of HgCdTe epitaxial materials. This enhancement is essential to meet the demands of high-performance infrared detector development.
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A high operating temperature long wave mercury cadmium telluride detector with large charge handling capacityXing Yanlei Song Shufang
Abstract:
In recent years, the high operating temperature device with its light weight, small size, low heat consumption characteristics, while reducing the cost of the same level of performance as the low temperature detector advantages, gradually become the focus of infrared research. The large charge processing capability has the advantages of wide dynamic range (DR), high sensitivity, strong signal detection, etc., and is widely used in LiDAR, astronomical observation and other fields. In this paper, a long-wave mercury cadmium telluride detector with high charge processing capacity and operating at high temperature is introduced. The charge processing capacity can reach 40Me- at 15μm pixel spacing. The main performance of the device at different operating temperatures is compared and analyzed. At 110K, the effective pixel rate can reach 98.5%, the noise equivalent temperature difference is 28mK, and the peak quantum efficiency is 40%. Compared with the performance at 77K, it can still reach a good level.
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Progress of HgCdTe Mercury-Rich Vertical Liquid Phase Epitaxy in 11th Research Institute of CETC
HAO Fei, She Wei-lin, YANG Hai-yan, Hu Yi-lin, Xing Xiao-shuai, YANG Mei-hua, Xing Wei-rong, SUN Hao
Abstract:
In this paper, we focuse on the36mm×42mm mercury-rich vertical liquid phase epitaxy(VLPE) technique. By modifying the structure of the graphite boat carrying the substrates, the batch growth of large-size double heterojunction materials with dimensions of 36mm×42mm has been achieved. By combining the phase diagram of material growth and the calculated fluiddistribution, the fields of fluid and temperature in the growth area of the material are optimized to meet the development requirements of p-on-n infrared focal plane array detectors. The thickness deviation of the grown material and the electrical performance satisfies our expectation. The overall performance of the material meets the requirements for fabricating large-scale, large-format p-on-n infrared focal plane array detectors.
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ZHANG Min, HAN Fang, KANG Jian, SUN Hao, GUO Liang, LI Chun-ling
2019,40(6):35-43
Abstract:
The characteristics of infrared thermal imaging technology are introduced, and the civilian application of infrared thermal imaging technology in civil aviation, electric power, petrochemical, forest fire prevention, medical and other civil fields is discussed. The market situation of infrared thermal imaging technology is introduced, and the development demand of infrared thermal imaging technology in different application fields are analyzed.
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2008,29(8)
Abstract:
介绍了一种利用MATLAB和数值逼近理论计算费米函数的简捷方法.计算结果的误差在10-6数量级,甚至可以更高.与其他方法相比,该方法具有精度高、使用便捷和速度快等优点.
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2008,29(12)
Abstract:
In this paper,the principle and features of four-wave mixing are given.The generation of four-wave mixing is derived in theory and the applications of four-wave mixing in the DWDM for optical fiber communication,phase conjugation wave generation and real time optical detection are given.The study in this paper is aimed at more completely knowing the application direction of the four-wave mixing, a typical nonlinear optical effect and finding more applications for the four-wave mixing by summing up the existing relatively mature applications and research methods.
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Nie Jianhua, Liu Jiaqing, Meng Xin, Han Shunli
2019,40(6):44-48
Abstract:
In order to realize the reasonable classification of optical spectrometers, the classification study is carried out from the working band and spectroscope of the spectrometer. On the basis of in-depth research on the development status of existing spectrometer products at home and abroad, the related research is summarized and analyzed, and the specific classification methods and classification results are given. At the same time, by using known spectrometry technology and the research result, the comparative research conclusions of spectrometers are introduced, and the key technologies and core components are pointed out. This conclusion can provide spectrometer researchers with a panoramic viewing angle and also provide a valuable reference for tracking industry development.
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2010,31(3):42-46
Abstract:
According to the finite difference principle, a one-dimensional Schr\"{o}dinger equation can be converted into a set of nodal linear equations expressed in a matrix equation after the space is divided into a series of discrete nodes with an equal interval. The matrix left division command offered in the MATLAB software can be used to derive the function approximation of each unknown nodal function. This method is simple in concept, convenient in operation and can solve large linear equations without more efforts in programming.
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2008,29(12)
Abstract:
The good properties of THz wave and how to use photoconductive antenna and optical rectification to generate THz wave are described in detail.The applications of THz wave in long distance surveillance,imaging,exploder distinguishing,nondistructive inspection and particularly in the field of military are presented.
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2019,40(7):35-46
Abstract:
The noise sources and denoising methods of functional near-infrared spectroscopy (fNIRS) brain imaging are reviewed. The method and operation of suppressing noise are analyzed and given from the aspects of imaging principle, noise source and occurrence mechanism. The composition and characteristics of the interference are analyzed in detail, the effective removal method is given, and the signal quality algorithm in the process of brain imaging analysis and modeling of near-infrared spectroscopy is improved. These methods can provide guidance for the analysis and processing of near-infrared spectroscopy brain imaging data. Three noise sources that affect near-infrared spectroscopy brain imaging signals are summarized: instrumental noise, experimental error and physiological interference from the body. Two practical denoising algorithms are given and the development trend of imaging technology is expounded.
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GUO Xiao-Dong, ZUO Zhi-Gao, YUE Song, HONG Pu
2019,40(7):18-25
Abstract:
The theoretical model of infrared point target detection system is systematically analyzed. The transmittance of medium-wave and long-wave infrared light under typical atmospheric conditions is calculated by establishing the atmospheric stratification model and combining the MODTRAN model. The comparison data of the two calculation results can provide reference for the band selection in the design of infrared detection system. By analyzing the theoretical model of infrared radiation intensity of targets, the infrared radiation intensity of several typical targets in different wavebands is calculated, which provides support for the demonstration of operation range for IR system. Based on the probability density distribution function of infrared image noise, the theoretical formulas of image signal-to-noise ratio, system detection probability and false alarm probability are derived, which provide reference for setting detection threshold. The theoretical model analysis results of infrared point target detection system''s operation range can offer an important theoretical support for improving the credibility of infrared detection system''s operation range demonstration and the rationality of system parameter design.
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2010,31(3):11-14
Abstract:
The typhoon center is usually located manually by meteorologists. This location method has a low degree of automation. According to the movement characteristics of typhoon and the meteorological analysis theory, a single infrared satellite cloud image is used to establish a method for extracting the dominant cloud movement vectors. On this basis, the optimal target function for locating the typhoon center automatically is set and resolved. The automatical location of the typhoon with an eye or without an eye is realized. The method is used to simulate the automatical location of the center of typhoon ``HAITANG' in several cloud images obtained in 2005. The result shows that this method has a high location accuracy and can be used as a good technical means for the automatical location of typhoon center.
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2019,40(6):27-34
Abstract:
From the perspective of theoretical numerical simulation and near-field radiation experimental research, the latest research results in near-field thermal radiation heat transfer are introduced. The focus of theoretical research is mainly on heat transfer studies in graphene composites, artificial processing and synthetic metamaterials. The focus of experimental research is on laboratory equipment manufacturing and method innovation based on nanoscale near-field thermal radiation measurements. Very near-field thermal radiation measurements with a minimum distance of only 2 nm have been experimentally implemented. Further research on near-field thermal radiation provides a theoretical basis for thermal photovoltaic, radiant cooling and efficient energy harvesting applications.
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wngxinkun, zhaofang, wangjianjiang
2019,40(7):1-11
Abstract:
With the advent of various new types of detection radars, advanced infrared detectors and precision guided weapons, infrared & radar compatible stealth materials have become the focus of current stealth technology research. The stealth principle and research status of traditional and new infrared & radar compatible stealth materials are reviewed, and the development direction of future infrared & radar compatible stealth materials is summarized and forecasted.
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2013,34(7):15-19
Abstract:
Starting from the Schrodinger equation, the influence of different Al composition and different temperatures on the absorption spectra of wide quantum well infrared photodetectors (QWIP) is studied. It is found that when the Fermi level is fixed, the ground state bound energy of the quantum well may increase with the increasing of the Al composition and the corresponding absorption spectral peak tends to move toward the short wave. In addition, the influence of the ambient temperature on the response spectra of AlGaAs/GaAs QWIPs is negligible. After theoretical calculation, the rule of the absorption spectrum of an AlGaAs/GaAs QWIP changing with quantum well width, Al composition and temperature is given.
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2008,29(12)
Abstract:
第一部分 一、探测与识别 1.高光谱图像的结构模型中正交子空间投影探测器与匹配滤光片的分析比较(P.Bajorski,美国罗彻斯特理工学院)
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2008,29(8)
Abstract:
本文研究由介电系数和磁导率为负的材料组成的一维光子晶体中的电磁波脉冲的传播特性.利用传输矩阵的方法,计算出了该结构中脉冲传播的透射谱和相时间.数值结果表明,在光子带隙的带边和带底会分别出现脉冲传播速度减慢和加快的现象.若周期结构中间存在缺陷层,光子带隙中会出现极窄的透射峰,因此,对应于该频率的电磁波在该体系中传播时速度会变得更加缓慢.
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Gao Yuxuan, Chen Xingming, Dai Jun, Yang Meixia, Huang Shoubin, Chen Xiang, Hou Zhenyan, Huang Jian
2023,44(4):20-32
Abstract:
Focusing is a key part of the launch focusing device in highenergy laser systems, and the focusing mechanism plays an important role in the targeting and striking accuracy of the system. In order to understand the research status and development trend of focusing mechanism, various types of foreign mature focusing mechanisms are introduced firstly. The principle of their focusing control and the solutions of various technical problems are analyzed. The domestic research situation focuses on four types of focusing mechanisms: cam, screw, worm gear and direct drive. For each form of focusing mechanism, the basic principle of controlling focusing is analyzed, and the design features of the focusing mechanism applied to different systems are introduced. By analyzing the design and control of each type of focusing mechanism, the advantages and disadvantages are summarized and compared, and the design ideas and research directions of the focusing mechanism for high-energy laser systems are proposed to lay the technical foundation for the research on focusing mechanism of high-energy laser systems.
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PAN Ming-zhong, QI Hong-xing, XIAO Gong-hai, SHU Rong
2010,31(1):1-7
Abstract:
A compact field hyperspectral imaging spectrometer based on a prism-grating-prism structure is presented. The system is designed for the wavelength range from visible light to near infrared. It has 344 spectral bands with the spatial resolution higher than 10 nm and the spectral resolution higher than 1 mrad. To study the unmixing of mixed pixels, the basic principle of the field hyperspectral imaging spectrometer is described, the main specifications of the system is analyzed, the design of the system is discussed in detail and related tests are conducted. The test results show that the system has both higher spatial resolution and higher spectral resolution. Because of its compactness and reliable operation, it is very suitable for field applications. Thus, the feasibility of the use of a compact field hyperspectral imaging spectrometer in the research on the unmixing of mixed pixels is verified.
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2011,32(8):25-28
Abstract:
Sea-sky-line detection can be implemented by effectively suppressing the background and enhancing the target in an image according to the features of sea-sky environment. An improved method for wiping off crass points is proposed on the basis of the linear fitting algorithm. The method is simulated with the Matlab software. The simulation result shows that this improved method can effectively detect the positions of the sea-sky-line and ships against the sea-sky background. It provides a good basis for target recognition and image registration.
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WUWEI, HANSHUNLI, HOUXIBAO, LIULEI, XIANGGUOQING
2017,38(6):1-7
Abstract:
According to the spectral response curves and dark current of a near infrared two-dolor detector in two different operation wavebands, a signal acquisition system based on the near infrared two-color detector is designed. The system has many current-voltage conversion levels, voltage amplification levels and filter circuit bandwidth levels. It can amplify signals and control bandwidth quickly. Moreover, it provides zero analog signals for four amplify circuits via a Digital-to-Analog (D/A) convertor. This can effectively eliminate the noises caused by the stray light and the dark current of the detector itself. The system has the features of high speed, low noise and high resolution. By using this signal acquisition system, many parameters of the optical system, such as signal-to-noise ratio, dynamic range and minimum measurable power, can be improved.
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2016,37(4):27-32
Abstract:
An algorithm combining Light of Sight (LOS) with the OpenGL software interface is proposed. The method uses the depth measuring and occlusion query functions of the OpenGL software interface to determine the effective emission surface in the detection direction and the transfer path of its radiation in mediums. Then, it uses LOS to obtain the radiation characteristics of the target in atmosphere in the detection direction. The simulation result shows that this algorithm is effective and has high computation efficiency.
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BAI Wei, ZHAO Chao, GONG Zhi-hong
2017,38(1):6-11
Abstract:
Combining with the X-ray diffraction technique and the layer-by-layer chemical etch method for peeling damage layers, the depth of the damage layer in InSb crystal introduced by cutting, lapping and polishing was analyzed quantitatively. The structures and causes of damage layers were discussed. The research result showed that cutting was the major process for introducing damage layer on the surface of InSb wafers. The depth of the damage layer introduced by cutting was up to 16 microns. The depth of the damage layer introduced by double-face lapping was about 12 microns. The depth of the damage layer introduced by mechanical-chemical polishing obviously decreased. It was about 2 microns.
