为了提高光幕靶法测速系统的性能,提出一种激光光幕靶前端电路的设计方案.使用PIN光敏二级管阵列作为激光光幕靶接收部分的传感器,根据PIN光敏二级管的特性设计前置放大电路,将微弱光信号转换为电信号并进行预放大；提出采用消除误差的PIN管阵列新技术,并选用仪表放大电路进行后级放大.结果表明:该方案能避免环境因素对信号的影响,提高系统的信噪比,改善激光测速仪的性能.%In order to improve the performance of velocimeter, the front-end circuit design of laser velocity target was proposed. The PIN photodiode array was used as the sensors of the receiving part of the laser screen targets. According to the characteristics of the PIN photodiode, the preliminary amplification circuit was designed, which could transfer the faint optical signal to electrical signal and amplify the signal preliminarily. Put forward a new technology in which the error-elimination PIN array. And the instrument amplification circuit was used to conduct the successive amplification. The result shows the method can decrease the influence of the environmental factors, and enhanced the system noise-signal ratio (SNR) and improved the performance of laser velocimeter.
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