基于FPGA的非致冷红外焦平面偏压稳定电路

FPGA-based Bias Stabilizer for Uncooled Infrared Focal Plane

温度变化对非致冷红外焦平面成像的均匀性有一定的影响。其中一个原因是,受温度影响后,非致冷红外焦平面的偏置电压会变得不稳定,使焦平面输出产生微小偏差,从而降低成像质量。针对以上问题,利用FPGA接收ADN2850输出反馈的方法,将数据与预设值进行比较,从而可以不断校正与预设值的差值,使偏压电路保持了稳定,提高了红外焦平面的成像质量。该方法具有精度高和反应快的特点。

Temperature variation has influence on the imaging uniformity of an uncooled infrared focal plane.The reason is that the bias of the uncooled infrared focal plane may become unstable after it is affected by temperature variation,resulting in a subtle deviation in the output of the focal plane.Thus, the quality of the image formed by the focal plane is degraded.To solve this problem,a method which uses a FPGA to receive the output feedback from a ADN2850 is proposed.Because the data can be compared with the preset value by using this method,the data difference from the preset value can be corrected continuously.Therefore,the bias circuit can be kept stable and the imaging quality of the infrared focal plane can be improved.This method has the features of high precision and fast response.