288×4长波红外探测器数据采集模块的设计

A Design of Signal Acquisition Module for 288×4 Long-wavelength Infrared Detectors

针对288×4长波焦平面红外探测器组件的特点,设计了一个数据采集模块,以FPGA为核心,为探测器提供时序与控制信号,同时对探测器输出的四路红外模拟图像信号进行高精度的模数转换,然后将红外数字图像信号向后端传送。实验结果表明,采集到的红外图像具有噪声低、稳定性好等特点。当探测器在293 K黑体的照射下,并且积分时间为19μs时,整个红外图像采集系统的平均噪声等效温差(NETD)在30 mK左右。

According to the characteristic of 288×4 LWIR CMOS Integrated Detector Dewar Cooler Assembly, a data acquisition module is designed based on FPGA to provide clock and control signals, translating four channels of infrared analog image signals to digital signals accurately, and then sending the infrared digital image signals to the back end. Experimental results show that the collected infrared images have the characteristic of low noise and high stability. The average NETD of the whole infrared image collecting system is about 30 mK, when the detector is radiated by the 293 K blackbody and the integral time is set to 19μs.