基于模糊PID算法的红外面源黑体设计

Design of Infrared Surface-Source Blackbody Based on Fuzzy PID Algorithm

针对红外热像系统检测需求,采用紫铜辐射面、热电制冷器、散热片等设计了红外面源黑体的结构,采用铂热电阻和24位AD采样,实现了环境温度及辐射面温度的高精度采集。为克服黑体时间常数大、响应滞后、环境温度持续扰动等问题,设计了模糊PID控制器,根据偏差及其变化率实时整定控制参数,实现超调量小、响应速度快、稳态精度高等目标。实验及测试情况表明,温控精度为±0.03℃,响应时间小于180 s,达到了设计要求。

To address the detection needs of the infrared thermal imaging system,an infrared surface-source blackbody was designed,which was composed of purple-copper radiant surface,thermoelectric cooler and cooling fin,etc. The high-precision acquisition of the environment temperature and the radiant surface temperature was realized by using the platinum thermistor and 24 bit AD sampling. To solve the problems in the blackbody of big time constant,response lag,persistent disturbance of the environment temperature,a fuzzy PID controller was designed. The control parameters of it were set in real time according to the error and the error variation rate. The goals of small overshoot,rapid response speed and high steady-precision were realized. It is proved by experiments and tests that the temperature control precision is ± 0. 03 ℃,and the response time is less than 180 s,which meet the design requirements.