Contents
2023
Volume: 44 Issue 8
6 Article(s)
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Development and Prospect of Hyperspectral TargetClassification Technology
Bin ZHANG, Yan-sen SUN, Xiao-jie LI, and Pei LIU
Hyperspectral imaging technology originated from remote sensing, has the unique advantage of spectral integration. It is increasingly widely used in agriculture and forestry, geology and mining, anti-counterfeiting and environmental protection. As the most common and basic function of hyperspectral technology, target cHyperspectral imaging technology originated from remote sensing, has the unique advantage of spectral integration. It is increasingly widely used in agriculture and forestry, geology and mining, anti-counterfeiting and environmental protection. As the most common and basic function of hyperspectral technology, target classification plays a vital role in the application of hyperspectral fields. In this paper, the development status of hyperspectral target classification technology is reviewed, the structural characteristics of hyperspectral data are analyzed, the general process of hyperspectral target classification is summarized, and the mainstream methods and basic principles of data reading, image preprocessing and target classification are described in detail. Combined with the typical cases in recent years, the process of hyperspectral target classification is analyzed, and the development trend is analyzed and prospected..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 8, 1 (2023)
High-Temperature Accelerated Storage Per formance of Indium Antimonide Wafers
Wei WU, Chen DONG, Chao ZHAO, Tao DONG, Wei-lin SHE, Ting HUANG, Zhi-qiang PENG, and Qian LI
The stability of the performance of indium antimonide wafers during storage and use is one of the important factors affecting the performance of the prepared detectors. In order to investigate the performance changes of indium antimonide wafers under long-time storage, high-temperature accelerated storage test was carrThe stability of the performance of indium antimonide wafers during storage and use is one of the important factors affecting the performance of the prepared detectors. In order to investigate the performance changes of indium antimonide wafers under long-time storage, high-temperature accelerated storage test was carried out on indium antimonide wafers, and several important performance parameters such as geometrical parameters, surface roughness, electrical parameters and dislocation defects were tracked and detected in the process of the test. The results show that under the conditions of high-temperature accelerated test, except for the slight change of wafer shape, other properties basically do not change, and the wafers can be stored for a long time..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 8, 13 (2023)
Optimal Design Method of Mechanical Weak Structure in Infrared Detector-Dewar Assembly
Yang-wen ZHANG, Xing SHEN, Xiao-mai HONG, Hai-ling CHENG, Yun-peng LI, En ZHOU, Ming-chang LI, Zhuo ZENG, Hao HUANG, and Li HUANG
Based on the theoretical analysis of the cantilever beam structure of the detector-dewar assembly , the optimal design method of the mechanical weak structure of the dewar assembly is proposed, and Ansys software is used to simulate the structure of the dewar assembly before and after optimization. The results show thaBased on the theoretical analysis of the cantilever beam structure of the detector-dewar assembly , the optimal design method of the mechanical weak structure of the dewar assembly is proposed, and Ansys software is used to simulate the structure of the dewar assembly before and after optimization. The results show that the modal first order fundamental frequency of dewar assemblies is significantly increased, which is 130% higher than that of parallel supported assemblies and 317% higher than that of conventional unsupported assemblies. Through the test verification, it is found that the vibration resistance of dewar assemblies has also been greatly improved, and 15g durable random vibration, 176g short-term mass random vibration as well as 2000g mechanical impact can be resisted..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 8, 20 (2023)
Study on Surface Passivation of Silicon-based HgCdTe Infrared Detector
Yong-xi DAI, Bin HE, Tian-liang ZHENG, Ti NING, Qian LI, and Yu-zhu ZHANG
The surface passivation of mercury cadmium telluride (MCT) materials is one of the key processes in the preparation of infrared detectors.High-performance MCT devices require stable and reproducible passivation surfaces and interfaces that meet the device performance requirements. Therefore, it is of great significanceThe surface passivation of mercury cadmium telluride (MCT) materials is one of the key processes in the preparation of infrared detectors.High-performance MCT devices require stable and reproducible passivation surfaces and interfaces that meet the device performance requirements. Therefore, it is of great significance to explore MCT surface passivation technology. Molecular beam epitaxy (MBE) in-situ passivation and magnetron sputtering passivation techniques of MCT were studied. The results show that the compactness of the in-situ passivation film by MBE is better, the defect holes on the surface of the passivation layer are smaller, the lattice matching between the passivation layer and the MCT is better, and the current-voltage (I-V) characteristics of the device streamer are better than normal passivation by magnetron sputtering..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 8, 28 (2023)
Portable Infrared Target Simulator Based on Zoom Dual-Band Design
Jin-shan SHAN, Lei-lei SHI, and Xiao-kai TAO
With the wide application of infrared imaging equipment in military and civilian fields, how to judge the technical status of infrared imaging equipment quickly and consistently as well as analyze and solve problems becomes more and more urgent. In this paper, a portable infrared target simulator based on zoom dual-banWith the wide application of infrared imaging equipment in military and civilian fields, how to judge the technical status of infrared imaging equipment quickly and consistently as well as analyze and solve problems becomes more and more urgent. In this paper, a portable infrared target simulator based on zoom dual-band is proposed. Through the design of high-precision blackbody (accuracy: better than 001℃ during -10℃ and 260℃), card insertion and pull-out target, and 3×continuous zoom dual-band projection structure, the detection requirements of infrared imaging equipment are met. Compared with other simulators, the simulator takes into account two bands and improves the application range of the equipment. In addition, the replaceable target and zoom projection are conducive to taking into account the simulation detection requirements of different infrared imaging equipment at different distances. According to the test results, the expected goal is achieved, the practical simulation test demand is realized, and the problem of high cost is solved..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 8, 34 (2023)
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