Digital phase-shifting shearography for strain measurement by using a rotating platform system

Ping Sun

doi:10.1117/1.2010127

1 August 2005 Digital phase-shifting shearography for strain measurement by using a rotating platform system

Ping Sun

Author Affiliations +

Optical Engineering, Vol. 44, Issue 8, 085601 (August 2005). https://doi.org/10.1117/1.2010127

Abstract

A phase-shifting technique for full-field measurement of the strain of an object in electronic speckle-shearing interferometry is presented. The object under study is placed on a rotating platform and illuminated by an expanded laser beam. Its images are recorded at short intervals by a shearing CCD camera and stored directly into a computer. By subtracting the series of images from the first one, fringe patterns that represent the object surface strain can be obtained and shown on a computer monitor if the object is loaded. When the object is given a small angle of rotation, an additional phase will be introduced into the fringe patterns. Theoretical analysis shows that this additional phase is linear. Therefore, the electronic speckle shearing phase-shifting technique can be realized by rotating the test object. The small angle can be obtained exactly by a rotating platform controlled by a computer. The theory of the method and system as well as some experimental results is presented.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Ping Sun "Digital phase-shifting shearography for strain measurement by using a rotating platform system," Optical Engineering 44(8), 085601 (1 August 2005). https://doi.org/10.1117/1.2010127

Published: 1 August 2005

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