电子散斑干涉中相移技术研究

本文介绍了电子散斑干涉（ESPT）原理、相移技术方法。针对散斑条纹图中高频项对于相位计算的干扰，对相移算法提出了2种修正的方法。对简支梁进行了位移场的测量，并与有限元（FEM）计算结果进行对比，证明了改进的相移技术在ESPI中是可靠的。

Study on Phase-shifting Techniques in ESPI

In the research of phase shifting methods in ESPI,two new kinds of improvement algorithms about phase shifting are presented to reduce the interference of high frequency terms in speckle pattern during phase caculation.In order to prove the reliability of the improved phase shifting algorithms,typical beam is measured by using ESPI and improved phase shifting algorithms.The experimental results are offered.The beam is also caculated by using finite element method(FEM).The comparison between experiment and caculation shows that the improved phase shifting algorithms are effective in ESPI