Contents
2022
Volume: 43 Issue 7
8 Article(s)
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Review of CO2 Concentration Detection Based on Non-Dispersive Infrared Method
Qi LIU, Lei WANG, Xiang-bing ZHU, and Zhen-yu WANG
Carbon dioxide (CO2) is one of the important components of greenhouse gases. Real-time detection of its concentration changes is of great significance for alleviating the greenhouse effect. Non-dispersion infrared (NDIR) method has the advantages of good stability, fast response and wide measurement range. It is widelyCarbon dioxide (CO2) is one of the important components of greenhouse gases. Real-time detection of its concentration changes is of great significance for alleviating the greenhouse effect. Non-dispersion infrared (NDIR) method has the advantages of good stability, fast response and wide measurement range. It is widely used in portable gas detection and other fields. Firstly, the advantages of NDIR method in CO2 detection are analyzed, and the principle of NDIR detection is briefly summarized. Then, the basic structure of the NDIR gas analyzer is described in detail. The classical gas calibration methods of the measurement system are summarized. Finally, the characteristics of NDIR are comprehensively analyzed, and the future development trend is prospected..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 1 (2022)
Development Status and Analysis of Airborne Photoelectric Reconnaissance Pod
Sai ZHANG, Hui MA, and Qing-rong WEN
As an important mission sensor for the carrier to obtain battlefield information and preempt the enemy, the airborne photoelectric reconnaissance pod has been widely equipped on various air weapon platforms. Taking several foreign advanced airborne photoelectric reconnaissance pods as typical representatives, the develAs an important mission sensor for the carrier to obtain battlefield information and preempt the enemy, the airborne photoelectric reconnaissance pod has been widely equipped on various air weapon platforms. Taking several foreign advanced airborne photoelectric reconnaissance pods as typical representatives, the development status, main performance indicators, and technical characteristics of airborne photoelectric pods are summarized. According to the needs of future operations, the development trend of airborne photoelectric pods and the key technologies that need attention are analyzed..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 8 (2022)
Study on InSb Infrared Detectors Failure Mechanism Based on Reliability Test
Wei-ting ZHANG, Ti NI, Zhong-he LI, and Chun-ling LI
In the chip accelerated life reliability test, temperature is the most important part. Firstly, based on the temperature change in the chip reliability test, the effect of high-temperature baking on the photoelectric performance of the InSb infrared detector chip is explored. Then, the types of blind pixels are classifIn the chip accelerated life reliability test, temperature is the most important part. Firstly, based on the temperature change in the chip reliability test, the effect of high-temperature baking on the photoelectric performance of the InSb infrared detector chip is explored. Then, the types of blind pixels are classified, and the possible causes of pixel damage are summarized. Finally, the finite element analysis software is used to simulate and analyze the thermal stress of the detector structure, and further clarify the mechanism of chip fragmentation. It can be seen from the simulation results that the force at the center of the chip is relatively large, and its value is about 680 MPa, which is consistent with the phenomenon that the center of the InSb detector is prone to fatigue failure. A new way of studying the failure mechanism of InSb detectors is provided, which has certain practical guiding significance for the development of high-performance InSb infrared detectors..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 15 (2022)
Design and Verification of the Space-cold Optical Long-wave Infrared Camera
Ming-xu LI, Shu-xin WANG, Qiang LIU, Jian-yu MIAO, Zhong-shan WANG, and Xin HE
In order to meet the adaptability of infrared imaging products in complex and variable environments and realize the function of the products, the design of the space-cold optical long-wave infrared camera is studied in this paper. Firstly, the structural design of the long-wave infrared camera is performed. Then, PartaIn order to meet the adaptability of infrared imaging products in complex and variable environments and realize the function of the products, the design of the space-cold optical long-wave infrared camera is studied in this paper. Firstly, the structural design of the long-wave infrared camera is performed. Then, Partarn/Nastran finite element software is used to analyze the camera. The influence of temperature drop and gravity on the surface shape of all the lens are studied, and the first three order modes of the camera are calculated. Then, the wave aberrations of the camera are tested. Finally, the modulation transfer function test of the camera in a vacuum environment is completed. The experimental results indicate that the root-mean-square value of the camera is better than 1/50λ, and the calculated value of MTF is 018719, which can meet the accuracy requirements of the low-temperature infrared camera..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 21 (2022)
Analysis of Military Requirements and Key Technologies for All-optical Combat
Yi LIU, Jia-liang CHUANG, and Jiang-yong LI
When the US. military returns to great power competitive strategy and promotes the "Penetrating Counter Air (PCA) aircraft" and "Penetrating Electronic Warfare (PEW) aircraft" projects, from the perspective of military theory, the military requirements and response strategies of all-optical operatiWhen the US. military returns to great power competitive strategy and promotes the "Penetrating Counter Air (PCA) aircraft" and "Penetrating Electronic Warfare (PEW) aircraft" projects, from the perspective of military theory, the military requirements and response strategies of all-optical operations are first analyzed. Then, the concept and operational process of all-optical operations are sorted out, and the key technologies of all-optical operations are analyzed. Finally, the future application prospects of all-optical combat links are discussed. Through the analysis of military requirements, the concept of all-optical combat is derived, which will pave the way for the design, development and research of subsequent all-optical combat systems..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 29 (2022)
Influence of Urban Internal Structure and Population Density on Spatial Variation of Surface Temperature：A Case Study of Shinjuku in Tokyo
Xi CHEN, Chao-min CHEN, Ba-gan HASI, and Yoshida TAKAHIRO
With the acceleration of urbanization and the rapid population growth, the internal pattern of urban space is changing, and the urban heat island effect is increasing. This paper aims to seek sustainable development based on the relationship between the surface thermal environment and buildings as well as the populatioWith the acceleration of urbanization and the rapid population growth, the internal pattern of urban space is changing, and the urban heat island effect is increasing. This paper aims to seek sustainable development based on the relationship between the surface thermal environment and buildings as well as the population. Compared with other studies, novel data such as airborne thermal infrared images, airborne lidar data, building vector data and census data of Shinjuku district in Tokyo are used in this paper. The biggest innovation lies in the quantitative analysis of building density, average building height, average land surface temperature (LST) and population density. The results show that the correlation between average LST and building density is the largest (r=06718), followed by the correlation between average LST and population density (r=06050). The building density is positively correlated with the population density (r=04949). The average LST is negatively correlated with the average building height (r=-03814). It is concluded that rational planning of urban internal structure can provide reference for reducing urban heat island effect and sustainable environmental development..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 34 (2022)
Maintenance Method of Protein Detection Model of Two Batches of Scrambled Tomatoes and Eggs Based on Near Infrared Spectroscopy
Shu-juan XING, Kai CAO, Wen-song WEI, Xin AI, and Chun-jiang ZHANG
In order to solve the problem of model instability caused by spectral data difference, the transfer method of nutrient content prediction model of different batches of Chinese dishes is studied in this paper. Taking the samples of scrambled tomatoes and eggs prepared at an interval of 3 months as an example, spectral dIn order to solve the problem of model instability caused by spectral data difference, the transfer method of nutrient content prediction model of different batches of Chinese dishes is studied in this paper. Taking the samples of scrambled tomatoes and eggs prepared at an interval of 3 months as an example, spectral data are collected and protein content is determined by physical and chemical methods (120 samples per batch). The model of the second batch with better prediction effect is selected as the main model. A combination of PDS, MP and S/B (PDS-MP-S/B) is applied in dish model transfer to analyze the influence of different PDS window numbers and standard set numbers on the predicted results. When the number of PDS Windows is 11 and the number of standard sets is 100, the prediction result of protein content by PDS-MP-S/B algorithm is significantly better than that by no model transfer and by using the three algorithms separately. The absolute coefficient of prediction set (R2(Pred)) of prediction model is 09628, the relative prediction deviation is 56731, and the root mean square error of prediction is 03157. The model transfer is realized from three aspects of spectrum, model and result, which improves the universality of the model, reduces the cost of modeling, and provides theoretical support for the fast inspection of Chinese dishes..
INFRARED
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 7, 41 (2022)
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