微光ICCD信噪比测试技术研究

Measurement Technology of Signal-to-Noise of Low-Light-Level ICCD

为了精确测量在低照度环境下微光ICCD的信噪比值,为其性能评价提供参考,基于LabVIEW软件平台和NI采集系统设计了一套微光ICCD信噪比测试系统,实现了微光ICCD多视频格式图像采集、信噪比计算以及实验结果记录等功能。利用该系统对PAL制模拟相机和cameralink数字相机进行了对比测试,结果表明在10^(-5) lx^10^(-4) lx环境照度下,微光ICCD的信噪比值随照度增大而增加,且PAL制相机的信噪比值增大明显而camera link相机信噪比值增大较为平缓;同一照度4.66×10^(-4) lx测试条件下,信噪比的均方差范围在1.65%~2.3%,均小于5%,验证了该测试系统的稳定性和准确性。

To accurately measure the signal-to-noise ratio of low-light-level ICCD under low illumination conditions and provide a reference for performance evaluation, a set of LLL ICCD SNR test systems was designed based on the Lab VIEW software platform and NI acquisition system. This system achieves LLL ICCD multi-video format image acquisition, signal-to-noise ratio calculation, and experimental result recording. Using this system, the performance of a PAL analog camera and Camera link digital camera were compared. At an ambient illumination of 10-5 -10-4 lx, the SNR of the LLL ICCD increases with increasing illumination. Moreover, the SNR of the PAL camera increased significantly with gentle increase of the camera link. Under the same test condition of 4.66×10-4 lx, the RMS of SNR ranged from 1.65% to 2.3%, which verified the stability and accuracy of the test system as all values were less than 5%.