Small-pitch infrared detectors have become an important direction in the development of infrared detector technology. The preparation process level of indium bump, which connects the detector chip and the readout circuit chip, has become an important factor affecting the performance. The fabrication process of indium bump for infrared detectors with 10 m pitch is introduced. The new process uses multiple indium film growth combined with ion-etching methods, finally prepares a 10 m-pitch indium bump for infrared detector readout circuit (ROIC) with a height of 8 m and a non-uniformity of less than 5%, which solves the problem of insufficient height when small-pitch indium bump is fabricated by the conventional process. The advantage is that there is no need to prepare the indium bump on the two chip ends, which simplifies the process. The result provides an idea for the preparation of indium bumps for smaller pitch infrared detectors in the future.

With the rapid development of space remote sensing technology, the demand for space application of high-resolution infrared detectors increases. However, the refrigerator of this type of detector assembly is disturbed obviously during operation, which will affect the imaging quality of the detector. This disturbance needs to be suppressed to ensure the working state of the detector assembly on orbit. A super large-scale infrared detector assembly with a self-damping design structure is firstly introduced, and the effective research results are verified. Based on the obtained refrigerator disturbance test results, vibration isolation structures with different disturbance transmission paths are designed. Through simulation analysis and correction, the ground test verification is finally completed. This design can meet the needs of the detector component to achieve ultra-high-resolution disturbance suppression.

In order to achieve high sensitivity sensing in the near-infrared band, a photonic crystal fiber refractive index sensor based on surface plasmon resonance is designed and investigated in this paper. The air holes in the cross-section of this fiber are arranged in a circular lattice, which show the sunflower shape. The outer surface of the fiber cladding is deposited with a nano-film of indium tin oxide, and the change of refractive index of the surrounding environment is sensed by the coupling of the defect mode and the surface plasmon mode. The optical properties and sensing performance of this sensor are studied in detail by finite element numerical simulations. The results show that the sensor has a large refractive index sensing range and a high sensitivity.The refractive index measurement range is 1.29~1.39, the maximum wavelength sensitivity is 19659 nm/RIU, and the refractive index measurement accuracy is 2.92×10-5 RIU.

When falcon hypersonic technology vehicle 2 (HTV-2) flies in the atmosphere for a long time, aerodynamic heating is the main reason of body infrared radiation characteristics. Aerodynamic thermal prediction and heat transfer in complex structures are key points of the research on infrared radiation characteristics. Based on the structure and flight trajectory characteristics of HTV-2-like hypersonic gliders, coupling calculation methods of aerodynamic heat, three-dimensional finite element heat transfer and body infrared radiation for hypersonic gliding vehicles are established in this paper. On the basis of algorithm verification, the infrared radiation characteristics of HTV-2-like hypersonic gliders which fly along the assumed trajectory are calculated. The radiation intensity observed by the infrared detector from the ground in the 70° direction is greater than that from the sky in the -70° direction. The infrared radiation intensity at 3~5 m medium waveband is obviously greater than that of 8~12 m long waveband and 0.4~0.7 m short waveband. Choosing 3~5 m band is more beneficial to detect HTV-2-like hypersonic gliding vehicles.

In order to evaluate the flow field characteristics and infrared radiation characteristics of the anti-ship missile nozzle in supersonic flight state, the nozzle of “Xiongfeng-3”anti-ship missile is taken as the research object and the corresponding two-dimensional simulation model is established in this paper. The calculation results of the flow field show that the condensed phase particles have a significant effect on the flow field characteristics of the jet. Compared with the pure gas phase, the length of the axial high-temperature zone increases obviously with the addition of condensed particles, and the Mach number decreases faster. The calculation results of infrared radiation characteristics show that the infrared radiation characteristics of the nozzle and wake show strong symmetry. The maximum radiation intensity appears when the yaw angle is 60°,and the radiation intensity reaches 103.68 W/sr.

A total of 115 samples of camellia seed meal collected from Nanchang customs technical center are taken as research objects.The number of scanning times is 32, and the sample thickness is 4 mm. Standard normal variate (SNV), DG1 and SG9, which are the best pretreatment methods, are selected according to the influence of different pretreatment methods on the established near infrared models.The quantitative analysis models of ash content in camellia seed meal are established by partial least square method. The corrected correlation coefficient is 0.9698, the corrected root mean square error is 0.5236, the predicted correlation coefficient is 0.9575, and the predicted root mean square error is 0.6211.In order to verify the applicability of the models, the ash content of 15 camellia seed meal samples which are not involved in the establishment of the models are predicted. The predicted results are compared with the determination results of GB 5009.4-2016 by pair result t test. It is concluded that there is no significant difference between the results of this method and national standard method. This method will greatly improve detection speed and efficiency of the camellia seed meal quality, reduce the workload and the use of chemical reagents, which provides a technical basis for the realization of rapid and efficient quality classification and supervision of camellia seed meal.