Contents
2025
Volume: 46 Issue 4
7 Article(s)
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Simulation Research on Infrared Radiation Characteristics of Guided Aircraft
Hao WANG, and Ding-guo XU
Infrared radiation characteristics are an important part of studying the stealth technology of guided aircraft. Taking the AGM-88 high-speed anti-radiation guided aircraft as an example, a simulation and analysis study on the entire infrared radiation characteristics of the guided aircraft is carried out. The Reynolds-Infrared radiation characteristics are an important part of studying the stealth technology of guided aircraft. Taking the AGM-88 high-speed anti-radiation guided aircraft as an example, a simulation and analysis study on the entire infrared radiation characteristics of the guided aircraft is carried out. The Reynolds-averaged turbulence model is used to carry out flow field simulation calculations, and the discrete transfer method is used to more accurately simulate the infrared radiation characteristics of the supersonic flow field. Then, the infrared radiation characteristics under different working conditions are compared. The results show that the Mach number of the incoming flow has an important influence on the temperature and infrared radiation intensity of the missile body. With the increase of the incoming flow Mach number, the infrared radiation intensity increases significantly, reaching a maximum of more than 400 W/Sr. The component with the largest infrared radiation brightness is the high-temperature, low-pressure, and low-speed reflow zone formed in the engine area, and the infrared radiation brightness can reach a maximum of more than 180 W/m2. The pressure and temperature of the missile body head, wing and rudder area are relatively high, and the infrared radiation brightness is relatively large. This study can provide strong support for target detection and structural stealth optimization design of guided aircraft..
INFRARED
- Publication Date: May. 26, 2025
- Vol. 46, Issue 4, 1 (2025)
Study on Molecular Beam Epitaxy Process of Low-Defect 3 in Mid-Wave InAs/InAsSb Materials
Yong YAN, Peng ZHOU, Cong-ya YOU, Ming LIU... and Shu-pei JIN|Show fewer author(s)
The molecular beam epitaxy process of 3 in digital alloy (DA)-nBn InAs/InAs1-xSbx type-II superlattice materials is studied by changing the beam size of the material source and the material growth temperature. The results show that the quality of the grown material is the best when the Sb beam size is 3×10-7 torr The molecular beam epitaxy process of 3 in digital alloy (DA)-nBn InAs/InAs1-xSbx type-II superlattice materials is studied by changing the beam size of the material source and the material growth temperature. The results show that the quality of the grown material is the best when the Sb beam size is 3×10-7 torr and the growth temperature is 470 ℃. The density of defects with a diameter of more than 3 m on the surface of the material is 64 cm-2, the total thickness deviation is 8.16 m, the root mean square value of the roughness of the material relative to the reference surface is 0.339 nm, and the full width at half maximum of the －1st order diffraction satellite peak is 16 arcsec. The grown material is flat and uniform, with good lattice quality. The photoluminescence (PL) spectroscopy results show that the luminescence peak of the material at 75 K is located at 4.69 m; with the increase of temperature, the peak position produces a red-shift. The corresponding relationship between the Sb beam size and the experimental process, as well as the influence of material growth temperature and material defects are studied, which is of great significance for the growth of high-quality 3 in InAs/InAs1-xSbx type-II superlattice materials..
INFRARED
- Publication Date: May. 26, 2025
- Vol. 46, Issue 4, 11 (2025)
Optical Engineering Design of Multispectral Infrared Detector Assembly
Lu ZHANG, Dong-bing LI, and Zhi-kai FU
In the design of multispectral infrared detectors, multispectral filters are key components for realizing focal plane integrated spectrometry. The wider the spectrum splitter and the farther the mounting position is from the detector, the worse the assembly response non-uniformity and the greater the crosstalk between In the design of multispectral infrared detectors, multispectral filters are key components for realizing focal plane integrated spectrometry. The wider the spectrum splitter and the farther the mounting position is from the detector, the worse the assembly response non-uniformity and the greater the crosstalk between spectral bands. Based on a 6-band 512×3×6 assembly, a design method for multispectral filter parameters and detector size is proposed through light simulation calculation. A set of calculation programs that can iteratively calculate and optimize the above parameters is designed based on the light simulation calculation logic. A filter mounting process method is proposed, which provides a useful solution for the optical design of subsequent similar assemblies. The multispectral infrared detector filter designed in this paper has a splitter width of 30 m, a thickness of 0.6 mm, and a distance of 0.9 cm from the detector; the pixel size of the detector is 40 m×40 m, and the pixel pitch is 900 m. The assembly has completed preparation verification, the cooling time is 416 s, the non-uniformity of the response rate in the six spectral bands are 10.9%, 12.5%, 11.8%, 11.9%, 12.3% and 10.9% respectively, and there is no crosstalk between adjacent spectral bands..
INFRARED
- Publication Date: May. 26, 2025
- Vol. 46, Issue 4, 20 (2025)
Design of Cold Finger Structure with Gradient Wall Thickness for Low Heat Load Infrared Detectors
Chen YUE, Jie YAN, Guan WANG, and Zhi-hao FANG
With the improvement of the development level of cooled infrared detectors, the demand for low heat leakage has been put forward for the dewar structure. Through mechanical simulation and theoretical analysis of conduction heat load, a design of cold finger structure with gradient wall thickness for low heat load infraWith the improvement of the development level of cooled infrared detectors, the demand for low heat leakage has been put forward for the dewar structure. Through mechanical simulation and theoretical analysis of conduction heat load, a design of cold finger structure with gradient wall thickness for low heat load infrared detectors is proposed, and the influence of the outer diameter gradient position of the cold finger with gradient wall thickness on mechanical reliability and conduction heat leakage is explored. The results show that if a large-scale vibration condition is adopted, the outer diameter gradient position of the cold finger with gradient wall thickness can be appropriately moved up to enhance the stability of the structure; if a small-scale vibration condition is adopted, the outer diameter gradient position can be appropriately moved down. Under the premise of meeting mechanical reliability, the heat load is further reduced, and the component optimization verification is carried out. Under the premise of ensuring mechanical reliability, this structure can reduce the static heat load of the dewar by 15% to 18%..
INFRARED
- Publication Date: May. 26, 2025
- Vol. 46, Issue 4, 27 (2025)
Solution of Infrared Emissivity Based on Improved DBO Algorithm
Li FU, Guang-ming CHEN, Xu SUN, and Jian-hui XI
Aiming at the problem of emissivity solution using the reflection method, an indirect solution method of emissivity based on bidirectional reflectance distribution function (BRDF) is proposed. A reflection brightness measurement system is designed, and the wall reflection brightness data at multiple angles are measuredAiming at the problem of emissivity solution using the reflection method, an indirect solution method of emissivity based on bidirectional reflectance distribution function (BRDF) is proposed. A reflection brightness measurement system is designed, and the wall reflection brightness data at multiple angles are measured by the MR170 radiometer. The reflection brightness data in the 3－5 m and 8－14 m bands are regressed by the gated recurrent unit (GRU) network to eliminate the interference of atmospheric absorption. In order to accurately invert the BRDF model parameters, the algorithm is improved by adding three strategies: chaotic mapping initialization, Cauchy mutation and variable spiral search on the basis of the dung beetle optimization (DBO) algorithm. After calculating the BRDF values at different angles, the parameter values of the five-parameter function model are inverted by the improved algorithm, and then the infrared radiation distribution in the entire space is obtained. Compared with other algorithms, the convergence speed of the improved algorithm is greatly improved, the final emissivity is 0.4236, and the relative error between the theoretical test sample and the algorithm is 11.75%. This study can provide a reference for indirectly solving the emissivity problem..
INFRARED
- Publication Date: May. 26, 2025
- Vol. 46, Issue 4, 33 (2025)
Study on Particle Capture Performance of Plasmonic Structures Under Different Parameters
Cheng-tao DONG, Jing-zhi WU, Yu AN, and Yan-hong WANG
The effect of the double nanohole (DNH) structure on the nanoparticle capture performance under different laser powers is studied, and the capture and rebound characteristics of the particles are analyzed. The DNH structure is simulated by the finite-difference time-domain (FDTD) method. The results show that at an incThe effect of the double nanohole (DNH) structure on the nanoparticle capture performance under different laser powers is studied, and the capture and rebound characteristics of the particles are analyzed. The DNH structure is simulated by the finite-difference time-domain (FDTD) method. The results show that at an incident wavelength of 852 nm, the transmission characteristics of the structure reach a peak, stimulating strong plasmonic effects, which enhanced the local electric field distribution by about 150 times. The DNH structure is prepared by focused ion beam technology, and 20 nm gold particles are captured under different laser powers. The experimental results demonstrate a positive correlation between the voltage jump signal difference (indicative of particle trapping) and laser power, with the most stable trapping state achieved at 6 mW incident power. In addition, the high capture efficiency of the DNH structure is verified by analyzing the particle rebound characteristics of 20 nm gold particles. Combining the simulation and experimental results, this study provides a theoretical and experimental basis for the design of efficient and low-thermal-damage optical tweezers systems..
INFRARED
- Publication Date: May. 26, 2025
- Vol. 46, Issue 4, 42 (2025)
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