提出了利用零差相干探测进行远距离、非接触振动测量的方法,并详细分析了振动物体在激光照射下的多普勒效应及其在相干探测中的信号表现形式,分析表明:激光光波频率变化率就是物体的振动频率,且与激光入射方向和照射位置以及激光波长无关。最后用连续CO_2相干雷达进行了验证实验,结果表明:通过检测振动物体表面的散射回彼来提取其特征频谱是可行的,这为远距离物体的特征识别提供一种新的可能方式。

A new method of measuring vibration is proposed based on Doppler effect with coherent detection when the objects to be measured are incidented on by laser beams. By the means of this method, it is possible to obtain information about displacement, velocity and vibrated frequency of the objects. This approach allows a non-contact measurement of small vibrations in a far distance. A series of experiments have been done. Vibration signatures from the object were obtained using a coherent CO2 laser radar.. Experimental results show that it is a possible method to distinguish a object by means of vibration measurements in the distant range.