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中文摘要：
针对汽车防撞系统中的激光测距技术，提出了利用数字脉冲涮制大功率窄脉冲半导体激光二极管（PLD），模拟开关拉升调制电平，以及电容充放电储能网路驱动PLD的方法，在车载12V电源电压下，实验实现了波长1．55μm、脉宽10ns、周期为1．6μs的激光脉冲发射，峰值功率大于3W。激光脉冲的光学收发装置采用了准值光路和双回转扫描技术，实现目标的二维扫描和同一性判断，同时用高灵敏积分器对信号进行数据采集实现测距。实验研究得到，该光电收发回路降低了激光发射电路的电源功率，减小了收发过程的测量误差，解决了对光脉冲窄脉宽测量的精度问题，并且有良好的电光特性。
英文摘要：
The laser ranging in vehicle collision avoidance system is studied. Under 12 V vehicular power supply condiction,laser pulse with 1.55μm wavelength,10 ns pulse width,1.6μs periode and above 3 W peak power is obtained by using digital pulse to modulate high-power short pulsed laser diode（PLD） ,and the capacitor energy storage circuit driver. Double rotating scanner and optical prover are used to transmit the pulse and receive it to photodetector, ranging is implemented by using high precision integrator to deal with the echo .signal. The experiment indicates this optic-electrical transmit-receive circuit can decrease the power supply of transmitter,reduce the measurement error in transmiting and receiving,avoid the measurement of pulse width,and also has well electrical-to-optical responsed.
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