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随着探测技术的飞速发展,红外探测器获得了越来越广泛的应用。对一种快速启动的微型红外探测器内部结构进行了数值模拟和传热计算。模拟结果表明:接触热阻对探测器组件冷却过程和时间的影响显著,通过调整接触热阻的大小,探测器芯片冷却到90 K所用的时间在4~10 s之间变动。初始环境温度和光阑表面发射率对芯片的冷却效果影响不大。节流冷头温度的变化对探测器组件冷却影响较大,当节流冷头温度下降较慢时,其对芯片启动时间影响较大。在实验过程中可以通过优化接触热阻和节流冷头这两个因素来提高探测器组件冷却效果,从而达到更高的要求。
With the rapid development of detection technology, infrared detectors have gained more and more widespread applications. The numerical simulation and heat transfer calculation of a kind of quick start micro-IR detector’s internal structure are carried out. The simulation results show that the contact resistance has a significant effect on the cooling process and time of the detector. By adjusting the thermal contact resistance, the time it takes for the detector to cool down to 90 K varies from 4 to 10 s. The initial ambient temperature and aperture surface emissivity have little effect on the cooling effect of the chip. The change of throttle head temperature has a great influence on the cooling of the detector module. When the temperature of the throttle head drops slowly, it has a great influence on the chip start-up time. In the process of experiment, we can improve the cooling effect of the detector components by optimizing the contact resistance and the throttle head, so as to meet the higher requirements.