用电子散斑干涉法测量材料热膨胀系数  

Application of electronic speckle pattern interferometry in thermal expansion coefficient measurements

作　　者：陈思颖[1] 黄晨光[2] 陈捷 王春奎[2] 段祝平[2] 

机构地区：[1]北京理工大学光电工程系,北京100081 [2]中国科学院力学研究所非线性力学国家重点实验室,北京100080 [3]中国兵器工业52研究所,内蒙古包头014034

出　　处：《强激光与粒子束》2004年第6期681-684,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题 (1 0 0 0 2 0 2 1 ) ;国家 863计划项目资助课题

摘　　要：利用双光束电子散斑干涉法 (ESPI)对试件受热变形进行了实时观测 ,针对一次实验过程中得到的图片较多 (30 0～ 5 0 0幅 )的特点 ,在图像处理时摒弃了以往的手动识别等位移线的办法 ,用MATLAB语言编写了批处理程序 ,能够在采集的大量散斑图片中自动快速准确地标定等位移线 ,得到相应的位移和应变 ,并结合实时测量的温度值 ,获得了 4 5钢和LY12铝合金在不同温升率下的热膨胀系数及其随温度的变化。实验结果表明 ,在涉及的温升率范围内 ,温升率的改变对材料热膨胀系数的影响不明显 。The thermal expansion coefficients of LY12 and 45 steel in different temperature-rising ratio are acquired by electronic speckle pattern interferometer (ESPI). For the pictures (300-500 frames) of each experiment, a batch processing code was designed to identify the central lines automatically instead of the old manual recognition. After displacements and real-time temperature measurements obtained, the thermal expansion coefficients can be deduced. It is proved that in the temperature-rising-ratio range concerned in this paper, the thermal expansion coefficients are almost independence on temperature-rising ratio, and at the same time, they increase within a narrow range when the temperature rises.

关 键 词：热膨胀系数 电子散斑干涉法 温升率 

分 类 号：TN247[电子电信—物理电子学]