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机载多光谱扫描仪大多采用大口径平面型黑体作为机上实时热参考源。由于机载环境温度的变化范围宽,而且黑体表面温度容易受气流的影响,如何对大口径平面型黑体进行高精度温度控制是机载多光谱扫描仪设计的一个难点。设计了一种新的平面型黑体温度控制系统。该控制系统先通过基于CompactRIO的嵌入式PID算法产生PWM信号,然后用H桥将其放大,从而对热电堆的加热和制冷进行控制。实验结果表明,本文设计的温度控制系统在环境温度变化且黑体表面受气流影响的情况下,可将黑体温度控制在环境温度土20℃范围内的任一温度点,控制精度可达到士0.1℃,满足热红外参考源的应用要求。
Most airborne multi-spectral scanners use large-caliber planar blackbody as a real-time hot reference source onboard. Because of the wide variation range of airborne environment temperature and the influence of air flow on the temperature of the blackbody surface, how to control the temperature of the large diameter blackbody is a difficult problem in the design of airborne multi-spectrum scanner. A new planar black body temperature control system is designed. The control system first generates a PWM signal through a CompactRIO-based embedded PID algorithm and then amplifies it with an H-bridge to control the heating and cooling of the thermopile. The experimental results show that the temperature control system designed in this paper can control the temperature of blackbody body to any temperature within 20 ℃ of ambient temperature under the condition of ambient temperature and the influence of air current on the blackbody surface. The control precision can reach ± 0.1 ℃ , To meet the application requirements of thermal infrared reference source.