数字激光散斑照相技术测金属杨氏模量

Digital laser speckle photography to measure the Young modulus of metal

介绍了利用数字激光散斑照相技术测量了金属细丝的杨氏模量的方法.该方法将激光散斑随着金属丝的伸长而变化的过程用数字记录设备(CCD)拍摄下来,通过计算机程序对采集到的图像进行处理,并获得2张激光散斑图的干涉条纹,从而得到金属细丝伸长量并计算出相应的杨氏模量.该技术能够实现金属材料杨氏模量的自动测量,保证了测量过程的快速稳定,提高了测量精确度.

A method of measuring Young modulus using digital laser speckle photography was introduced.This method using CCD camera to capture the laser speckle images which carried the elongation information of metal wire.The interference fringes were obtained by the computer simulation of Fraunhofer diffraction of two specklegrams,thus the elongation of the wire was obtained,and the Young modulus was calculated.This method was fast and stable,which realized automatic measurement and improved the accuracy under computer control.