描绘一个振动现象,除了在理论上的阐述和数学上的推导外,在工程上常需要直接测量位移、频率、初始相位角等振动的三个物理量,而位移量可能是振幅值、速度值或加速度值。测量振幅的方法很多,本文将介绍一种新的测量振幅的方法,即用光栅干涉法测量振幅值的原理及其应用。 Describing a vibration phenomenon, in addition to the theoretical exposition and mathematical derivation, it is often necessary to directly measure three physical quantities of vibration such as displacement, frequency, initial phase angle and the like in engineering, and the displacement may be an amplitude value, a velocity value or Acceleration value. There are many ways to measure the amplitude, this article will introduce a new method to measure the amplitude, that is to use grating interference method to measure the amplitude of the principle and its application.