摘要
光子多普勒系统是一种基于外差技术的全光纤干涉系统,目前多用于瞬态高速运动目标的参数测量,但在低速精密位移下的材料动态力学性能方面研究较少,为此搭建了一套可以用于nm量级微位移测量的光子多普勒系统,并将其应用于激光激发的超声非接触检测。在实验中,通过研究脉冲激光在铝材料表面上激发的瑞利波特性,得出了瑞利波在铝材料中的传播速度,并与基于有限元软件COMSOL仿真计算的铝中瑞利波波速2 976.19 m/s对比,平均相对误差为0.316 549%。实验结果表明,光子多普勒系统是激光激发超声瑞利波探测的有效途径。
The Photonic doppler system is a kind of all fiber interference system based on heterodyne technology, now more used in transient high speed moving target parameter measurement, but in low speed precision displacement of material under dynamic mechanics performance study is less, so we set up a set of can be used for nm level micro displacement measuring photonic doppler system, and applied to the laser excited ultrasonic non-contact detection. In the experiment, the propagation velocity of Rayleigh wave in aluminum material is obtained by studying the characteristics of Rayleigh wave excited by pulsed laser on the surface of aluminum material, and compared with the Rayleigh wave velocity of 2 976.19 m/s in aluminum calculated by the finite element software COMSOL, the average relative error is 0.316 549%. The experimental results show that the photon Doppler system is an effective way of laser excited ultrasonic Rayleigh wave detection.
作者
刘昊
刘吉
武锦辉
司宇
赵子文
Liu Hao;Liu Ji;Wu Jinhui;Si Yu;Zhao Ziwen(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China)
出处
《国外电子测量技术》
北大核心
2022年第9期82-87,共6页
Foreign Electronic Measurement Technology
基金
山西省基础研究计划(202103021224188)项目资助。
关键词
光子多普勒
激光超声
瑞利波
有限元
photon doppler
laser ultrasound
rayleigh wave
finite element
