红外测温中检测强噪声下微弱信号的新途径

RESEARCH ON THE DETECTION OF WEAK SIGNALS IN STRONG NOISE

就“ＢＨＪ４００”型便携式电脑红外测温仪的研制从理论和实践角度介绍了以下内容：①提高红外光学系统信噪比的方法和途径；②提高红外探测器输出信号的方法和途径；③在探测器输出信号处理电路中滤除广白噪声、有效提取并放大深埋在强噪声中微弱目标信号的方法和途径．从而使该红外测温仪性能得到了最大限度地提高，实验结果和理论分析值相符。

We present the introduction of the development of model BHJ\|400 portable infrared fathometer.The following methods are introduced:(1) improving the signal noise ratio of the infrared optic syatem;(2)improving the output signal of the infrared detector;(3)in output circuit of the detector,filtering flat noise and efficiently extracting and amplifying weak target signals buried in the strong noise.Consequently,the operating performence of the infrared fathometer is maximized and the experimental result agrees with the theory,thus the designing requirements have been achieved.