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激光散斑法是测量平面面内位移的一个有效的方法。该方法比起实验应力分析的其他方法来具有许多优点,但是由于在应用该方法时仍存在一些困难,如位移正负方向难以确定和缺乏对位移的测量结果和位移导数详细、合理的分析,因而该方法还不能广泛地应用于工程,针对这种情况,作者在本文提出了判定位移正负方向的一个方法并对位移导数的实验结果进行了详细、合理的讨论,提出了几种改进精度的有效措施。
The laser speckle method is an effective method for measuring the in-plane displacement. This method has many advantages over other methods of experimental stress analysis, but there are still some difficulties in applying this method, such as the difficulty of determining the positive and negative direction of displacement and the lack of detailed and reasonable analysis of displacement measurements and displacement derivatives. Therefore, this method can not be widely applied in engineering. In view of this situation, the author proposes a method to determine the positive and negative direction of the displacement, and discusses the experimental results of the displacement derivative in detail and rationally, and proposes several improvements. Effective measures.