TDI型红外探测器空间校正方法的设计与实现

时间延迟积分(TDI)型红外探测器作为第二代红外探测器,具有更高的温度灵敏度和更大的扫描成像视场.和面阵成像探测器相比,TDI型红外探测器必须在装置中加入扫描机构进行扫描成像,由于TDI型红外探测器光敏元在空间的位置交错排列,为了保证奇偶像元对同一目标成像,这就涉及到扫描方向与探测器奇偶像元空间匹配的问题.以480×6红外探测器为例,详细介绍了TDI型红外探测器光敏元的排列结构、工作方式以及空间校正的原理,给出了空间校正的算法和FPGA实现方法,并通过仿真和实验验证了方法的正确性.

Design and Implementation of Spatial Correction Method for TDI Infrared Detector

As the 2nd generation infrared detector,TDI infrared detectors own more excellent temperature sensitivity and larger scanning imaging field.Compared to array imaging devices,TDI infrared detectors must apply the scanning device to make scanning imaging.Because the photosensitive element of TDI infrared detector is in staggered arrangement,so in order to ensure that the odd element and even element image on the same target,the matching problem of the scanning direction and odd/even element space position should be considered.Taking 480×6 infrared detector as an example,the structure of TDI infrared detector photosensitive element,the working mode and principles of spatial correction were introduced in detail.The arithmetic of spatial correction and FPGA realization method were given.And its validity was proved by experiments.