激光准直测量中的空气随机扰动影响抑制
Suppression of effects of air random disturbances in laser collimation measurements
刁宽 1刘晓军 1赵海煜1
作者信息
- 1. 华中科技大学 机械科学与工程学院,湖北 武汉 430074
- 折叠
摘要
鉴于准直光束在空气中传播,受空气随机扰动影响,如温度、湿度和压强的随机变化,激光直线测量基准存在随机抖动,从而影响激光准直测量的稳定性和准确性.从激光准直信号滤波的角度出发,提出了结合经验模态分解(EMD)-最小二乘(LS)拟合的空气随机扰动影响抑制方法;构建了激光准直信号分解、重构和校正的信号处理方案,以滤除空气随机扰动引起的干扰信号;开展了所提出方法在不同条件下对激光直线基准的空气扰动影响抑制实验,并比较不同方法对激光准直信号的处理效果.实验结果表明,所提方法对激光漂移补偿后的激光准直信号处理后,其在水平方向和竖直方向的波动标准偏差分别为0.01 μm和0.02 μm,有效解决了激光准直测量中的空气随机扰动对直线测量基准稳定性影响问题.
Abstract
The highly directional laser collimated beam is extensively used as a linear measurement refer-ence in precision measurement.However,random air disturbances like fluctuations in temperature,humid-ity,and atmospheric pressure can induce jitter,compromising stability and accuracy.This paper introduces a method to counteract these disturbances by using Empirical Mode Decomposition(EMD)combined with Least Squares(LS)fitting for laser collimation signal filtering.The developed signal processing scheme de-composes,reconstructs,and corrects laser signals to remove such interferences.Experiments under vari-ous disturbance conditions show that the method proposed results in a standard deviation of fluctuations of 0.01 μm in the horizontal direction and 0.02 μm in the vertical direction after processing the laser alignment signal following laser drift compensation,significantly improves the stability of laser collimation measure-ments affected by atmospheric randomness.
关键词
激光准直/直线基准/空气扰动/经验模态分解Key words
laser collimation/linear datum/air disturbances/empirical mode decomposition引用本文复制引用
基金项目
国家科学挑战专题资助项目(2018006-0102-02)
出版年
2024
国家科技期刊平台
NSTL
万方数据