求翻译：激光多普勒测速是一种非接触式测量技术，当光射向一个运动的物体，由运动物体散射出来的光与入射光相比，频率会发生变化，这个变化的大小与物体运动速度以及照射光与速度方向之间的夹角有关。是什么意思？

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Laser Doppler speed detection is a non-contact measurement techniques, when light shone a movement by movement of objects, objects of scattering out light and incident light frequencies, compared to change, and this change the size and speed as well as objects with light exposure speed the angle bet

The laser Doppler velocity measurement is one kind of non-contact survey technology, when the photoemission to a movement object, scatters from the mobile the light and the incident light compare, the frequency can change, this change size and the object velocity of movement as well as the illuminat

Laser Doppler Velocimetry is a non-contact measurement technology, when shooting a moving object from moving object compared to the scattering of light and incident light, frequency changes, that change the size and speed of moving objects, and light irradiation angle between the direction and speed

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