Abstract:With the wide application of image sensing and digital processing in the space field, space imaging is developing rapidly. On the one hand, space missions may be affected by complicated space environment. On the other hand, the demand for large field-of-view and high resolution space imaging is more and more urgent. However, traditional space imaging is difficult to meet the requirements. Therefore, space manipulation panoramic imaging is becoming the research focus in this field. The technology mainly involves the space panoramic imaging system and the space manipulation system. Firstly, the development of space manipulation panoramic imaging at home and abroad is presented. Then, the imaging model of a space panoramic camera is illustrated according to the composition principle of the space panoramic imaging system. The calibration, stitching and fusion methods of space panoramic imaging are classified and analyzed. Finally, the space manipulation system is described and its development trend in the future is forecasted.

Abstract:According to relevant basic concepts, the origin of the speed of light is presented from the point of dimensional analysis and thought experiment. The impossibility of faster-than-light is pointed out. The connotation of the concepts such as light quantum, quantum state, etc. is discussed in depth. On the basis of the view of photon splitting, the physical essence of quantum state representation of binary data is analyzed and the concept of controllable photon splitting is proposed. Controllable photon splitting is the precondition for realizing quantum state representation of binary data. The problems which the existing theoretical basis of quantum communication may face are discussed.

Abstract:According to a 640×480 uncooled detector with pixel size of 17 μm×17 μm, a long wavelength infrared varical optical system with varifocal ratio of 6× is designed with only 4 lenses. To meet the requirements of low cost and high transmission, an initial configuration is obtained through theoretical calculation. The aberration of the initial configuration is optimized by using the CodeV software. Finally, cam curve solution and image quality evaluation are carried out for the design result. The result shows that when the relative aperture of 1.4:1 is kept, the optical system can realize continuous zooming from 20 mm to 120 mm in the 8 to 12 μm waveband. The Modulation Transfer Function (MFT) at the spatial frequency of 20 lp/mm is greater than 0.5. It is found in the actual measurement of the prototype that the optical system has the features of large zooming ratio, compact configuration and high resolution. It is suitable for infrared monitoring systems.

Abstract:The intermediate temperature extended area blackbody is a wide spectral bandwidth infrared reference source. Its wavelength range covers near infrared to far infrared. As a reference source with high radiation intensity, it has been widely used in the calibration of infrared sensors such as radiation thermometers and infrared thermal imagers and in the measurement of the emissivity or transmission of samples. An extended area blackbody based on a robust structure with large emitting area is used to calibrate infrared sensors without collimators in laboratory or in the fields. To provide a solution for the performance test of infrared systems, an extended area blackbody is designed and its performance parameters are tested. The results show that the main parameters can meet the requirements of high stability and high precision.

Abstract:Since the operators of a certain photoelectric theodolite lack of actual operation experience and have high training cost, a Charge Coupled Device (CCD) image simulation system for the photoelectric theodolite based on Vega Prime is designed and realized. After analyzing the trajectory data of a mission, the conversion relationship between the geocentric coordinate and the simulation coordinate is established. The theoretical position of a target in the simulated scene is obtained. The attitude data of the target are calculated. The theoretical field-of-view angle of the simulated image is calculated according to the parameters of the optical system for the CCD sensor. The experimental results show that because the simulation system renders images both by target simulation and by field-of-view simulation, it can assure the trajectory and attitude of the target to be more consistent with the real mission. The operators of the photoelectric theodolite are trained. Their understanding of the operation flow is enhanced. The training efficiency is improved.

Abstract:Landmine exclusion has always been a difficult problem. The detection of landmines by an infrared system mainly depends on the infrared radiation difference between the landmine and the background. Firstly, the main factors affecting ground surface temperature are analyzed according to the heat balance equation. Taking the one-dimensional heat conduction equation as a model, the influence of buried landmines on ground surface temperature is analyzed. The variation of the surface temperature of the soil above a landmine and its surrounding soil with time in a day is calculated and compared with the actual measured values. On this basis, fitting analysis is carried out on the experimental data by using the Gaussian model. With a fitting model, the variation relationship between the ground surface temperature and the time can be obtained. The results show that the simulated landmine can block the normal thermal conduction between the soil above it and its surrounding soil and hence result in the temperature difference between the soil above it and its surrounding soil. This temperature difference can be detected by infrared technology.

Abstract:To solve the problem of low efficiency and poor conversion effectiveness of traditional quantization methods for gray scale measurement images, three fast quantization methods for gray scale images are proposed according to the actual processing requirements of measurement images and different operation demands. These methods have the features of high conversion efficiency, simple algorithm, easy implementation, small computation amount and strong adaptability to image quality. They have been widely used in the processing and analysis of infrared images and good effectiveness is achieved. Thus, the gray scale quantization quality of infrared images is improved remarkably.

Abstract:The Fourier transform infrared absorption spectra of Dibutyl Phthalate (DBP)/sunflower oil mixture were measured. By combining with the two-dimensional correlation spectroscopy, the measured spectra were divided into 500-1500 cm-1, 1500-2000 cm-1 and 2500-3200 cm-1 three bands for analysis. The analysis results showed that in the 500-1500 cm-1 band, the benzene ring and the functional group directly connected with the benzene ring were not sensitive to the change of DBP concentration. In the 1500-2000 cm-1 band, the C=O stretching variation of saturated carboxylic acid esters in sunflower oil were more sensitive to DBP concentration. In the 2500-3200 cm-1 band, the overlapping peaks at 2854 cm-1 and 2925 cm-1 were separated into multiple peaks at 2854 cm-1, 2873 cm-1, 2916 cm-1, 2925 cm-1 and 2940 cm-1 by using the two-dimensional correlation spectroscopy. With the increase of DBP concentration, the telescopic movement of CH2 was more obvious than that of CH3. The results showed that the combination of Fourier infrared spectroscopy with two-dimensional correlation spectroscopy could provide new ideas and methods for the rapid detection and migration of plasticizers.