脉冲激光干扰面阵CCD成像系统的实验研究

Experimental study on disturbing effect of pulsed laser against array CCD imaging systems

为了研究脉冲激光对面阵CCD的干扰效果,采用近场模拟实验的方法,设计了重复频率脉冲激光干扰CCD成像器件近场实验。当CCD器件表面接收激光功率密度达到2.97mJ/cm2时,观察和记录了CCD器件串音饱和现象;当CCD摄像机电子快门打开时,除发射窗口有激光光斑图像外,激光脉冲在激光器出光口竖直方向也会形成偏离出光口位置的漂移光斑图像。分析了CCD摄像机电子快门作用机理及图像信号转移方式机理,并对光斑漂移现象给出了合理解释。结果表明,重复频率脉冲激光可使CCD图像上出现漂移光斑而对图像形成干扰。这为重频脉冲激光干扰CCD的研究提供了理论基础和初步实验验证。

In order to study the disturbing effect of pulsed laser against an array CCD, experiment of CCD imaging system disturbed by repeated pulse laser was carried out at short-distance. Crosstalk effect of the CCD was observed and recorded at an energy density of 2.97mJ/cm2 received by the CCD detector. When the electric shutter of the CCD vidicon was turned on, the images of excursion laser spots were found in the vertical direction of the laser radiation windows except for laser beam spot image. Operation principle of the electric shutter and the transfer mechanism of the CCD were analyzed. Phenomena of laser spot excursion were explained. Experimental results indicate that CCD images can be disturbed by the spot excursion caused by repeated pulse laser. The resuh lays the academic foundation and elementary experiment for CCD disturbed by repeated pulsed laser.