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本文介绍了散斑照相法的一般原理、力学量记录及测量方法,导出了离焦散斑技术在转角测量中的近似关系式,最后提出了用散斑照相法测量材料的杨氏模量E和泊松比μ的特实,并给出了试验结果,它与以往其它方法相比,显得简单、准确、有效。目前,在实验应力分析中,散斑照相法已从最初作为全息法的补充(测量面内位移)发展到测量转角、振动,并推广到三维透明物体的内部位移场的测量。在工程中已用于测量平板弯曲、振动、裂缝尖端的张开位移等。
This paper introduces the general principle of speckle photography method, the amount of mechanical records and measurement methods, derive the approximate relationship of the focal angle speckle speckle in the measurement of the angle, and finally put forward the use of speckle photography method to measure the Young’s modulus E And Poisson’s ratio μ, and gives the test results. Compared with other methods, it is simple, accurate and effective. At present, in the experimental stress analysis, speckle photography has been developed from the initial supplement of holographic measurement (measurement of in-plane displacement) to measurement of rotation angle and vibration, and is extended to the measurement of the internal displacement field of three-dimensional transparent objects. In engineering has been used to measure bending, vibration, crack tip open displacement and so on.