Abstract:The development status and engineering application of foreign hyperspectral infrared focal plane detector assemblies are described, and the research progress of domestic hyperspectral infrared focal plane detector assemblies is introduced. By analyzing the performance characteristics of hyperspectral infrared focal plane detectors, the research focus of hyperspectral infrared focal plane detectors is proposed.

Abstract:Compact Dewar is not only one of the development directions of cooled infrared detector assembly but also the need for miniaturization and integration of future infrared imaging system. Dewar provides optical, mechanical and electrical interfaces for the detector assembly, so its compact design requires comprehensive consideration of refrigeration capacity, detection performance, vacuum performance and system application. Combined with the structure composition and working principle of Dewar, the method and influence of compact design are analyzed.The research has a better inspiration and guidance for the design of the Dewar.

Abstract:The output level of 12.5 μm HgCdTe detector is very sensitive to the working temperature, so it is necessary to study the temperature sensitivity. When doing experiments, adjust the working temperature of the detector, collect its output level and analyze the data. It can be seen from the analysis results that the variation of working wavelength and dark current with temperature is the main factor leading to the change of output level. The best working temperature of the 12.5 μm HgCdTe detector is around 60 K. The experimental method is simple to operate and does not require complicated operating equipment. Most infrared laboratories can meet the experimental requirements.

Abstract:The thermal infrared detector based on Mn-Co-Ni-O thin film is studied. The properties of the detector can be improved by adjusting the thermal conductivity of the substrate. For the thinner detection unit, a new kind of micro-bridge infrared detector is studied. It is find that the responsivity is about 80% higher than that of the nonmicrobridge device, and the detection rate is about 44% higher. This is mainly because its unique structural form reduces the thermal conductivity of the device, and the total reflection effect of light improves the light absorption rate of the detection element. For the thicker detection unit, a polished copper sheet is added to the substrate, which increases the thermal conductivity of the substrate by about 47%, but the response voltage is reduced by about 50%. Therefore, a reasonable choice of heat dissipation copper is required to obtain a suitable time constant and responsivity.

Abstract:There is currently no equipment that can test the spectral response of digital infrared detectors. Therefore, a circuit board device is developed to convert the output of the digital infrared detector into the same output form as the analog detector. The original Fourier spectrometer is used to solve the problem that the digital infrared detector spectrum can not be tested. This method is low in cost, easy to implement, simple in operation, and stable in test performance, and is suitable for various forms of digital detectors. First, the infrared spectrum response test system is introduced, and then the principle analysis of the developed analog-to-digital circuit board is carried out. Finally, this circuit board is implemented in hardware, and the internal test program is written to complete the functional verification. The result shows that the infrared spectrum test system with the newly developed analog-digital circuit board device can test the spectrum of digital area array detectors or linear detectors with different bit width outputs, and the test results are accurate and reliable.

Abstract:In this paper, the temperature detection of the reed inside RF coaxial switch based on the principle of fiber grating is studied， and the polyimide coated fiber grating is used. After the temperature calibration, the linearity of the fitting straight line using the external temperatures and the center wavelengths of the fiber grating is 99.914%. The center wavelength drift is 10.39 pm for every 1 ℃ rise. The calibrated fiber grating is placed at the reed of the RF switch for the temperature measurement experiment. The experimental results show that when the internal temperature of the RF switch reaches 300 ℃, the theoretical center wavelength deviation error of fiber grating is 0.02 nm, and the corresponding repeated temperature measurement error is 2 ℃, which provides an effective method for detecting the reed temperature inside the RF coaxial switch.

Abstract:Taking a platform in Chenghai sea area as an example, a set of security monitoring system suitable for unmanned offshore platform is designed and developed by using intelligent video monitoring system, automatic identification system of ships, public address and general alarm system, computer monitoring and some other technologies，which realizes the real-time online monitoring of the waters surrounding conditions and the landing place around the platform day and night. The system can intelligently identify illegal ships close to the platform and migrants landing the platform, and automatically trigger sound and light alarms to drive them away. The operation results show that the system can make accurate and timely response to abnormal events, and can automatically trigger associated equipment, thus improving the intelligent level of security monitoring of offshore platforms. This research has certain practical significance for optimizing the security monitoring technology of offshore platforms.