Based on the analysis of the working principle of automatic gain control (AGO circuit, the mechanism of laser jamming on AGC circuit is discussed, and the experiment of laser jamming on the AGC circuit of an infrared thermal imaging device is carried out. An analysis method which uses the change of regional gray scale to test the gain of AGC circuit is then proposed. Finally, a quantitative analysis is conducted on the experiment data, and the result indicates that, the persistent effective interference of laser on AGC circuit of infrared thermal imaging device can be realized, on condition that the pulse period of interference laser is less than the adjustment time of automatic gain.%为了研究激光对红外热成像设备自动增益控制(AGC)电路的干扰效果,在分析红外热成像设备AGC电路工作原理基础上,探论了激光对红外热成像设备AGC电路的干扰机理,开展了激光对某型红外热成像设备AGC电路的干扰实验,并提出了区域灰度变化测试AGC增益的分析方法.对实验结果进行了定量研究,结果表明:激光对红成像设备AGC电路持续有效干扰应满足干扰激光脉冲周期小于自动增益调整时间的条件.
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