文中主要介绍了在光测力学中全息光弹性法进行应力测定的原理、实验过程及计算方法。

The paper has mainly introduced the principles of stress determination, the experimental processes and the calculation methocl of holographic optical elasticity in optical measurement mechanics.

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研究方法：文献资料法、三维测力台测试法、摄像机现场拍摄法、录像解析法、数理统计法以及专家咨询法。

The research approach: documents and materials, three-dimensional force-testing, planar shooting on spot, film analysis, datum statistics and expert consultation.

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现在让我们来做个实验：你们桌上都有一个装了半杯水的烧杯，一个测力计，一个50克的法码。

Let's do an experiment. You all have a beaker half full with water, a forcemeter, and a 50g weight on your desk.

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