Khetan R P, Chiang F P
Appl Opt. 1976 Sep 1;15(9):2205-15. doi: 10.1364/AO.15.002205.
A two-dimensional analysis of a double-exposed speckle pattern as created by illuminating a plane surface with a beam of laser light is presented with the role played by the aperture illumination function described in detail. Between exposures, the surface is to undergo in-plane general deformation. Two approaches (one whole field and one pointwise) are presented to delineate from the speckle pattern the three Cartesian components of strain at each point in the field. An analogy is drawn between the whole field approach and the classical in-plane moiré method. Quantitative examples are included to demonstrate the validity of the methods.
本文介绍了通过用激光束照射平面表面产生的双曝光散斑图案的二维分析，并详细描述了孔径照明函数所起的作用。在两次曝光之间，表面将经历面内的一般变形。提出了两种方法（一种全场方法和一种逐点方法），用于从散斑图案中描绘出该场中每个点的应变的三个笛卡尔分量。全场方法与经典的面内云纹法之间进行了类比。包含定量示例以证明这些方法的有效性。
