为降低外界环境温度和内部发热元件形成的非均匀温度场对红外热成像仪的成像性能影 响。通过Proe和Ansys ICEPARK建立红外热成像仪的有限元模型, 在红外镜头表面进行黑色阳极氧化、喷砂处理增强辐射换热, 以及安装风扇增强对流换热保证高温环境时的散热, 低温环境时采用热电阻进行温升设计, 并仿真分析红外热成像仪在不同温度环境下整机内部温度分布和红外镜头温度分布情况, 并利用在高低温箱的红外热成像仪来观察平行光管中的靶标图的成像质量, 验证温控设计的高效性。结果表明: 所采用温度控制电路板对风扇与热电阻能进行温度控制, 当环境温度下降至0 ℃和升高至30 ℃时, 启动温控系统使红外热成像仪光学系统温度正常, 保证红外热成像仪的成像质量。

In order to reduce the ambient temperature and the non-uniform temperature field formed by the internal heating elements, the imaging performance of the infrared thermal imager was affected. The finite element model of the infrared thermal imager was established by Proe and Ansys ICEPARK. The black anodizing and blasting treatment on the surface of the infrared lens enhanced the radiation heat transfer, and the fan was used to enhance the convection heat transfer to ensure the heat dissipation in the high temperature environment. The thermal resistance was designed for temperature rise, and the internal temperature distribution and infrared lens temperature distribution of the infrared thermal imager under different temperature environments were simulated and analyzed. The infrared thermal imager in thehigh and low temperature chamber was used to observe the target in the collimator. The image quality of the graph verified the efficiency of the temperature control design. The results show that the temperature control circuit board can control the temperature of the fan and the thermal resistance. When the ambient temperature drops to 0 ℃ and rises to 30 ℃, The temperature control system is activated to make the temperature of the infrared thermal imager optical system normal, and the imaging quality of the infrared thermal imager is ensured.