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本文用单光束激光散斑干涉法测量了内燃机连杆的变形。文中讨论了用激光散斑干涉法测量变形时，影响测量精度的各种因素，并认为变形测量的准确性主要取决于散斑干涉条纹间距和成像放大倍数的测量。为了准确测量条纹间距和成像放大倍数，文中改进了测量方法，将再现的杨氏条纹用ＣＣＤ摄像机输入到计算机，用数字图像处理技术对条纹图进行处理，并用统计方法获取条纹间距。另外实物和散斑图像也摄入计算机，根据实物和像所占据的像素数得到准确的放大倍数。用上述原理和方法，对材料为４０Ｃｒ的内燃机连杆变形进行测量，并与理论计算作了比较。结果表明，单光束激光散斑干涉法所需条件简易，测量精度满足要求，较适合于工程应用。
In this paper, single beam laser speckle interferometry was used to measure the deformation of the connecting rod of an internal combustion engine. In this paper, the various factors affecting the measurement accuracy when laser speckle interferometry is used to measure the deformation are discussed. The accuracy of the deformation measurement is mainly determined by the speckle interference fringe spacing and the imaging magnification. In order to accurately measure the fringe spacing and the imaging magnification, the measurement method is improved. The Young’s fringes reproduced are input to the computer with a CCD camera. The fringe patterns are processed by the digital image processing technology, and the fringe spacing is obtained by a statistical method. In addition, speckle and speckle images are also taken into the computer to obtain accurate magnifications based on the number of objects and the number of pixels occupied. Using the above principle and method, the deformation of the connecting rod of the internal combustion engine with 40Cr material was measured and compared with the theoretical calculation. The results show that the conditions required for single beam laser speckle interferometry are simple, the measurement accuracy meets the requirements and is suitable for engineering applications.