In order to improve the performance, output and material quality of the large area array type-II superlattice infrared detector, the optimal molecular beam epitaxy (MBE) growth condition of the long-wave InAs/GaSb type-II superlattice on 3-in GaSb substrate was studied. Combined with reflection high-energy electron diffraction (RHEED) fringes, the effects of different deoxidation temperature and growth temperature on the quality of 3-in epitaxial wafers were studied. The surface morphology, uniformity and lattice quality of the wafers were characterized by optical microscopy, atomic force microscopy (AFM), wafer defect inspection system, white light diffractometry, high-resolution X-ray diffractometer (HRXRD)， and X-ray diffraction simulations. After optimization, the density of defects above 1 μm of the epitaxial wafer is 316 cm-2, the roughness is 0.37 nm, the total thickness variation (TTV) is 19.6 μm, and the cut-off wavelength at 77 K is 9.98 μm. Based on the molecular beam epitaxial growth process of 2-in long-wave type-II superlattice, the changes in the growth conditions after increasing the size of the GaSb substrate were studied. This is of reference significance for the adjustment of the conditions of III-V molecular beam epitaxy process after the size is increased. It also lays the foundation for the scale, quality and productivity improvement of the antimony-based type-II superlattice infrared detector array.

The manufacture of infrared detectors needs to use high-purity single crystal materials such as CdZnTe. When producing such high-purity single-crystal materials, zone melting purification methods are required to increase the purity of raw materials from 6N (99.9999%) to 7N (99.99999%). In order to prevent the adhesion of purified raw materials to the wall of the quartz boat vessel at high temperatures, it is necessary to form a carbon film with uniform thickness and strong adhesion on the surface of the quartz boat. The traditional method of coating carbon film method on the surface of the quartz boat has the problem of uneven coating and difficult removal of impurities. A carbon fumigation furnace based on methane pyrolysis in a vacuum environment with carbon particles adhering to the outer surface of the quartz boat was designed. The heating temperature and consuming time of methane decomposition were calculated. The heating temperature control performance and carbon fumigation experiments were carried out. When the heating temperature is between 1000 ℃ and 1200 ℃, 25% methane pyrolysis takes 1.734 s to 0.014 s, which is short and easy to achieve carbon film bonding. When the carbonization heating temperature is 1106 ℃, the temperature control accuracy in the middle of the carbonization zone is ±0.1 ℃. Between 400--780 mm in the transverse position of the furnace cavity, the temperature of the inner cavity of the quartz tube is greater than or equal to 1100 ℃. It′s heating temperature control stability and carbon fumigation performance are good, the adhesion between the carbon film and the quartz boat is good. The carbon film is pollution-free and the thickness is uniform.

The principle, classification and characteristics of infrared focal plane array are briefly introduced in this paper. From the two aspects of cooled and uncooled, and according to the mainline of materials and technical parameters, the development status of IRFPA is analyzed, the products and technical characteristics of various types of IRFPA are listed, and its development trend is predicted. Finally, the applications of infrared imaging technology in space remote sensing fields such as environmental detection, imaging reconnaissance and missile warning are summarized, and its application prospect is forecasted.

Aiming at the difficulty of infrared image segmentation of buried landmine targets under complex background conditions, a region of interest (ROI) selection method based on morphology and clustering algorithm is proposed using the similarity of landmine shape characteristics and multiple landmine targets in the minefield.After eliminating the noise of the original image and suppressing the background by differential morphological filtering, the area where the target is located is reduced.Then the similar features of multiple targets in a certain area are used to cluster the suspicious areas, further reducing the target areas. The threshold segmentation is carried out respectively.Finally, the recognition is completed according to the relevant features of the target.The processing results of measured images show that this method has good segmentation effect and high positioning accuracy for buried multi-mine targets.In addition, the calculation speed of the algorithm is fast, which can meet the actual demand of mine detection.

In order to improve the adjustable focus range of the image, the previous adaptive sharpness autofocus algorithm adopts different evaluation methods for deep and light defocused images, but does not give a clear method for judging the depth of defocusing of the image, which affects the feasibility of the algorithm. In order to solve this problem, the image edge is extracted from Sobel operator, and the step edge is selected through the threshold in this paper, so as to use the step edge width to judge the defocusing degree of the image. Experimental results show that this method can judge the sharpness of single image without reference. Compared with SMD and Laplace methods, it has the advantage of being scene-independent. The standard deviation of the edge width of the same definition image in different scenes is only 0.0676. In addition, the edge width is positively correlated with the defocus degree of the image, which proves the effectiveness of the proposed method.The accuracy of the algorithm in this paper has reached 86.8%, which has certain advantages compared with the high-frequency sum algorithm and the algorithm based on the clarity of the no-reference structure.

The existence of breeze vibration is a serious threat to the normal operation of transmission lines. In view of this, the monitoring equipment of transmission line breeze vibration monitoring system should have the characteristics of strong antimagnetic ability, high accuracy and easy installation. An online monitoring scheme of transmission line breeze vibration based on thermal imaging camera and image processing technology is designed. The implementation of the scheme in hardware and software is described in detail. The design can accurately measure the dynamic bending strain of transmission lines in real-time and online, and has the ability to resist electromagnetic interference, which effectively ensures the monitoring demand of the transmission line breeze vibration.