1 December 1991 Automated measurement of 3-D shapes by a dual-beam digital speckle interferometric technique
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This paper presents a novel technique for generating contours of diffused objects using a dual beam speckle interferometric setup and a PC-based digital image processor. With the object illuminated by two coherent beams , two speckle patterns are digitized, one before arid one after the object is slightly rotated. By taking the difference between the two digitized images, a fringe pattern is formed which depicts the object contours. The phase distribution relating to the depth information of the object surface is automatically extracted by means of an image processing technique employing two dimensional digital Fourier transform.

The method is simple, fast, relatively accurate, and provides a very wide range of sensitivity. The sensitivity depends on the amount of object rotation which can be easily varied. Theory of the method together with experimental results are presented.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dahuan Shi, Dahuan Shi, Jing Qin, Jing Qin, Y.Y. Hung, Y.Y. Hung, } "Automated measurement of 3-D shapes by a dual-beam digital speckle interferometric technique", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49514; https://doi.org/10.1117/12.49514

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