基于AVR的非致冷探测器温控系统的设计

Design of Temperature Controller for UFPA Detector Based on AVR MCU

非致冷焦平面热成像系统由于自身的众多优点,在诸多军事和民用领域都具有广泛的应用。作为当前红外成像领域的研究热点,非致冷焦平面的工作温度特性在很大程度上决定了非致冷探测器的成像质量。为了满足快速、稳定和数字化的系统要求,采用AVR单片机对非致冷探测器的温度系统进行控制,通过调节单片机内部比例积分校正网络参数,提高了非致冷探测器温控系统的运行速度和稳定性。相比于其他方法,该方法在数字可编程化、稳定性和快速性上都有了较大的提高。实验结果表明,该温控系统能够使非致冷探测器精确、稳定地工作在最佳温度点。

Because of many advantages,uncooled focal plane thermal imaging systems are widely used in both military and civil fields.To a large extent,the operating temperature characteristics of an uncooled focal plane array can decide the imaging quality of the imaging system.To meet the fast,stable and digital requirements of an uncooled focal plane thermal imaging system,an AVR Microprogrammed Control Unit（MCU） is designed.The running speed and stability of the temperature control system are improved by adjusting the parameters of a proportional-integral（PI） compensation network in the MCU.Compared with other methods,this method has a greater improvement in digital programmability, stability and running speed.The experimental result shows that the temperature control system can keep the uncooled infrared detector operating at the optimal temperature accurately and stably.