Abstract:To reduce the complexity of the infrared optical system effectively while increasing the field of view of a panoramic imaging system, a catadioptric optical structure is used and a diffractive surface is introduced through reasonable rationing of the mirror and lens focal power. A catadioptric once-imaging uncooled infrared panoramic imaging optical system with the field of view up to 360°×(from -40° to 50°) and a catadioptric secondary imaging uncooled infrared panoramic imaging system with the field of view up to 360°×(from -30° to 50°) are designed respectively. The imaging system operates in the waveband from 8 m to 12 μm and its F number is 1.2. It can implement staring imaging at a certain pitch angle in a 360-degree viewing range. The design results show that the system is simple and compact in structure, large in posterior intercept and good in imaging quality. Its modulation transfer function value at the special frequency of 20 lp/mm is greater than 0.4, which can meet the application requirements.

Abstract:InSb Infrared Focal Plane Array (IRFPA) detectors have always occupied an important place in the medium infrared waveband. With the development of science and technology, it is urgent to find out a precision machining method for InSb single crystals. A precise Single Point Diamond Turning (SPDT) machine is used to make InSb crystal be thin. There are several variable parameters, such as spindle speed, cutting depth and feed rate etc, for SPDT machines. Through an orthogonal experiment, the optimal working parameters for single point diamond turning of InSb crystals are determined. By combining with the double crystal diffraction measurement, it is found that the damaged depth of cutted InSb crystals is less than 3 μm. This InSb device processing experiment shows that the SPDT technology meets users'' requirements and achieves good results.

Abstract:When the step scanning Fourier Transform Infrared (FTIR) modulation Photoluminescence Spectroscopy (PL) is used for measurement, the background disturbance is eliminated by combining the superiority of FTIR with the advantages such as non-destruction, high sensitivity and convenient of PL, so as to enhance signal intensity. The influences of background noise, impurity level and temperature on the emission intensity and location in InAs/GaSb strain superlattice material are studied. By changing the measurement parameters, different measurement methods are summarized. The research results are of referential value to the epitaxy of InAs/GaSb strain superlattice materials and the subsequent processing of them.

Abstract:Infrared radiation characteristics are the important indexes of weaponry. Nowadays, the characteristics of weaponry are usually designed through theoretical calculation. Then, the static experiment is made on them in a wind tunnel. Finally, they are verified in the outdoor dynamic experiment. Compared with the design and the experiment made in a wind tunnel, the outdoor experiment may meet many complicated factors. Therefore, it is necessary to identify the accuracy of infrared measuring equipment used outdoors. The identification method of the outdoor calibration accuracy of infrared measuring equipment is described and the practical measurement results are given.

Abstract:As a high efficient two-phase heat transfer device, the loop heat pipe implements far distance transfer of heat mainly by using the gaseous phase change of a working fluid. Therefore, the nature of working fluid and its filling ratio have a great influence on the performance of the loop heat pipe. Several key factors including figure of merit, fluid filling rate and gravity that have influences on the performance of loop heat pipes are studied theoretically and experimentally. The loop heat pipes are optimized. By using a pulse-tube cooler as the cold source, the application performance of it integrated with the loop heat pipe is studied. This research has laid the theoretical and experimental foundation for the space application of loop heat pipes.

Abstract:The infrared thermal image distribution and mathematical mean of human′s breast region were observed. Their value to the diagnosis of breast diseases is analyzed. 125 patients who met the conclusion criteria in the outpatient department of the treating potential disease center of Liuzhou Traditional Chinese Medicine Hospital from June 2016 to January 2017 were selected as research objects. The mathematical mean of infrared thermal imaging in the projection region of double mammary gland was observed by a digital medical infrared thermal imager. At the same time, breast ultrasound and mammography were performed on all objects. The mathematical mean of infrared thermal imaging of each object, their distribution rule and the results under different examination items were recorded. The correlation and difference of the results were analyzed statistically. The results showed that there was a positive correlation between the mathematical mean of infrared thermal imaging and the degree of breast lesions. The results of breast ultrasound and mammography were compared with the corresponding mathematical difference of thermal imaging. Their difference was not significant statistically (P>0.05). Therefore, there was a correlation between the mathematical mean of infrared thermal imaging of breast region and different breast diseases. Among them, the mathematical mean of infrared thermal imaging of breast cancer was highest and that of normal breast was lowest. To some extent, the mathematical mean of infrared thermal imaging was more sensitive to the breast diseases than the breast ultrasound in diagnosis.