Abstract:In recent years, with the increasing improvement of the ranking of precision guided weapons in modern wars, the development and application of infrared imaging guidance technology have attracted more and more attention at home and abroad. However, since the combat missions and battle environment are more and more complicated, the requirement of infrared imaging guidance systems for precision guided weapons is becoming higher and higher. According to the future military development and the current status of infrared imaging guidance technology, it is pointed out that the infrared imaging guidance will develop toward multiband hyperspectral, laser active imaging, multi-mode imaging and low cost infrared precision guidance technologies. The key technologies required in the development of infrared imaging guidance including high performance infrared detector, adaptive imaging anti-jamming, multi-dimensional information fusion and system structure optimization etc are proposed.

Abstract:The high absorptivity of metamaterial absorbers originates from the local surface plasmon resonance (LSPR) in the interface between metal nanoparticles and dielectric medium as well as the resonant absorption induced by the micro-cavity composed of a metal nanoparticle layer, a dielectric medium layer and a metal reflector layer. The absorbance of a metamaterial absorber is closely related to the size and shape of nanoparticles and the material and thickness of dielectric medium. A metamaterial absorber which has nearly perfect absorption at the wavelength of 1.2 μm in the near infrared waveband is designed and optimized. Taking this design as a blueprint, a series of devices with different dielectric medium thicknesses are prepared by using the nanoimprint lithography (NIL). The absorption properties of these devices are studied quantitatively by using the reflection absorption spectroscopy. The experimental results show that the metamaterial devices prepared by NIL have the advantages of good process reliability and high machining precision. The absorption change trend measured in experiment is consistent with the theoretical expectation and the absorption is high.

Abstract:Cadmium Zinc Telluride (CZT) crystal is the substrate material required for fabricating HgCdTe infrared focal plane array detectors. Its preparing technology includes four parts: polycrystal synthesis, crystal growth, substrate processing and quality evaluation. The exothermic process of raw material synthesis and the control method of material stoichiometric ratio are studied. By measuring the temperature of the quartz crucible in the synthesis process, the exothermic rate is calculated. The dynamic process of CZT synthesis reaction is observed by a video surveillance system and the factors which have influence on the synthesis reaction rate are revealed. On this basis, the reaction rate and material stoichiometric ratio are controlled effectively by using the technologies of gradient temperature and directional solidification.

Abstract:By using the Si₃N₄ ceramic porous material as a wick, a cryogenic loop heat pipe prototype which uses ethane as its working fluid is designed. The cool-down and heat transfer performance of the prototype is studied. The experimental results show that this cryogenic loop heat pipe can operate at room temperature and realize cool-down smoothly when 4 W heat is applied on the evaporator. In the cool-down process, the cool-down of the cryogenic loop heat pipe may quicken with the increase of heat power. When the temperature of the evaporator is 190 K, the prototype can transfer 30 W heat stably.

Abstract:As an important part of a Precision Guided Weapon (PGW) system, the infrared tracking system is mainly used for search, recognition, aiming and tracking on a moving carrier. Because the perturbation of the moving carrier has effect on the performance of the infrared tracking system, it is necessary to isolate the perturbation so as to eliminate its effect on tracking. By studying the operation principle of the infrared imaging system, the factors which might cause infrared images to be perturbed are found. The effect of perturbation on an infrared tracking system is analyzed qualitatively. Finally, some suggestions on how to overcome perturbation when the infrared tracking system is used are made.

Abstract:An automatic alarm system for monitoring personal working status in those sites where watchkeepers are needed is developed. The system is developed by using an automatic control module and a serial port control module based on infrared detection technology according to practical application needs. It incorporates the modern electronic PCB making technology, the Arduino microcontroller technology and the computer programming technology. Compared with other monitoring systems, this system is not only simple and low in cost, but also has several functions of monitoring, reminding, alarm and background logging.

Abstract:Taking the polarized hyperspectral reflectance of the farmland soil in northeast China as the object to be studied, the reflective spectral characteristics of soil and their relations with soil fertility are analyzed in terms of zenith angle, incident angle, polarization and so on. The results show that multi-angle measurement may affect the reflective spectral characteristics of soil. This is mainly reflected in the polarized reflection ratio. When the measurement is carried out at the azimuth angle of 180° and the polarizing angle of 90°, the soil would receive more energy so that its polarized reflectance is higher. The soil fertility is obviously correlated with the polarized reflectance of soil. The greater the composite index of soil fertility is, the lower the polarization reflectance of soil is. Under the best remote sensing observation condition of farmland soil, the quality of soil fertility is judged preliminary. This provides a certain theoretical and practical basis for the further study of multi-angle polarized hyperspectra of soil and can provide a reference for the related study of balanced fertilization of crops, precision farming and quantitative remote sensing of soil.

Abstract:The operation principle of infrared thermal imaging is presented. The infrared thermal imaging is firstly proposed to be used in the production of electric heating glass. Its feasibility and effectiveness are verified. Further, the application of infrared thermal imagers in the testing and examination of electric heating glass is studied and three application examples are given. The research result shows that infrared thermal imagers not only can be used to qualitatively analyze the heating uniformity of electric heating glass and quantitatively measure the heating temperature difference of glass surface, but also can be used to nondestructively test glass products, find and analyze their defects and conduct the improvement of glass manufacturing processes.