双光栅测量微弱振动实验中振幅计算的新视角  

A New Perspective on Amplitude Calculation in Dual Grating Measurement of Weak Vibrations Experiment

作　　者：刘丹 范进龙 吴成康 张莉焕 LIU Dan;FAN Jinlong;WU Chengkang;ZHANG Lihuan(School of Electronic Engineering,Chengdu Technological University,Chengdu 611730,China)

机构地区：[1]成都工业学院电子工程学院,四川成都611730

出　　处：《大学物理实验》2025年第2期42-45,共4页Physical Experiment of College

基　　金：校级教改项目(20230106);四川省大学生创新创业训练计划项目(202411116095)。

摘　　要：根据简谐振动速度一般式的积分结果,明确了半周期光拍计数法中应选择的光拍信号时段。在分析半周期内光拍信号的首、尾曲线光拍数目时,利用旋转矢量法修正了两种分别以最大值和零值为节点曲线的光拍数目计算公式。此外,根据动光栅振动速度与光拍信号周期的关系,提出一种新的最小周期法计算微弱振动振幅,拓展了微弱振动振幅的计算思路。Based on the integral result of the general formula for simple harmonic motion velocity,the time period of the optical beat signal in the half-cycle optical beat counting method is clarified.When analyzing the number of optical beats in the initial and final curves of the optical beat signal within a half-cycle,the calculation formulas for the number of light beats in the curves of maximum value nodes and zero value nodes are corrected using the rotating vector method.Furthermore,based on the relationship between the vibration velocity of the moving grating and the period of the optical beat signal,a new minimum period method for calculating weak vibration amplitude is proposed,which expands the approach to calculating weak vibration amplitude.

关 键 词：光拍信号 振幅 最小周期法 

分 类 号：O4-33[理学—物理]