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为了解决光电探测靶在低照度或夜间条件下不能工作的问题,提出采用红外探测技术设计其探测光学系统,改善其探测性能。根据热辐射原理,及弹丸在高速运动中与外界热交换特点,采用节点网络法,建立弹丸表面热辐射计算方程,并分析高速弹丸在探测光幕的红外辐射特性;利用微分元法,求解弹丸在光幕产生的红外辐射亮度;通过探测光学系统,建立红外探测器的输出光信号量与弹丸在光幕的辐射通量关系;结合弹丸长度与作用距离,分析高速运动弹丸作用在不同幕厚的信号变化,以及不同速度、不同直径弹丸作用在光幕的红外辐射。
In order to solve the problem that the photodetection target can not work under low illumination or nighttime conditions, the infrared detection technology is proposed to design its detection optical system to improve its detection performance. According to the principle of heat radiation and the characteristics of heat exchange with projectile during high-speed movement, the node network method was used to establish the equation of thermal radiation on projectile surface, and the infrared radiation characteristics of projectile in detecting light curtain were analyzed. The differential element method was used to solve projectile The intensity of the infrared radiation generated by the light curtain is measured; the relationship between the output signal quantity of the infrared detector and the radiant flux of the projectile in the light curtain is established through the detection optical system; the effect of the high speed projectile on different curtain thickness Signal changes, and different speeds, different diameter projectile role in the light curtain infrared radiation.