一般说来，如此超薄得振动膜应该是透明的，可允许激光束穿过。
Normally a diaphragm so thin would be transparent, allowing the laser's light to escape.
光学测量法中以光干涉测量技术最为常见和应用广泛，可实现高精度的非接触式振动测量。
Optical measuring method, optical interferometry is the most common and used widely for high accuracy non-contact vibration measurement.
指出在隧道内，车体的横向振动加速度可减少30%左右。
It points out that in tunnel, the lateral vibration acceleration of the car body can reduce by about 30%.
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