Answer:
A laser Doppler vibrometer (LDV) is a science tool used to evaluate a surface's non-contact vibration
Explanation:
laser Doppler vibrometter (LDV) is a science tool used to evaluate a surface's vibration without in contact to the surface. The LDV laser beam is directed to the surface of significance & the wave amplitude, frequency is obtained from the reflected laser beam frequency's Doppler change due to ground movement. it identifies the Doppler effect or shift of laser light reflected from the sample object
