Pointwise automatic analysis of speckle photographs

Details Pointwise automatic analysis of speckle photographs Pointwise automatic analysis of speckle photographs

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991opten..30..382z&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 30, April 1991, p. 382-385.

Physics

2

Moire Fringes, Speckle Patterns, Television Cameras, Accuracy, Edge Detection, Gratings (Spectra), Strain Measurement, Tracking Filters

Scientific paper

An automatic system for analyzing specklegrams point by point is described. A new method of evaluating Young's fringes based on making a TV camera scan both horizontally and vertically is proposed. Tracking, filtering, and edge locating techniques are developed to acquire fringe data. Experiments show that Young's fringes can be determined with an accuracy of 1 percent in spacing and 1 deg in orientation, and the displacement can be found with an accuracy of 1 micron in the range 20 to 100 microns.

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