单模VCSEL(Vertical cavity surface emitting laser)激光器自混合LDV(Laser Doppler veloci-tymeter)系统的温度特性和外腔长度Lext(激光器前腔镜到目标散射面之间的光程)可变范围优于多模激光器LDV系统.应用差频模拟锁相环信号处理技术,明显提高了单模VCSEL自混合LDV测速精度和测速动态范围.用多普勒频移,fd的分频跟踪三角波电流调制技术,提高了运动方向判别的精度和动态范围.实验结果表明,在外腔长度为30 mm±3 mm、温度为0℃～55℃、采样时间0.1 s、激光器无温控的条件下,分辨率优于0.2%;在测速范围为30～480 mm/s的条件下,测速精度优于1%;在速度范围为5～480 mm/s的条件下,测速精度优于2%.在电源电压为5 V时,正向运动方向指示电平大于4.9 V,反向运动方向指示电平小于0.1 V.
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