Curvature patterns of bending plates by speckle-shearing interferometry |
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Authors: | Fang Jing K -H Laermann |
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Institution: | (1) Department of Mechanics, Peking University, 100871 Beijing, P. R. China;(2) FB-11, Bautechnik Wuppertal University, Wuppertal, Germany |
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Abstract: | This paper describes a method to obtain the curvature and twist patterns of a bending plate by combining optical carrier technique
and digital image processing. A carrier consisting of parallel fringes is obtained in double-exposure by changing the illumination
form so that the deflection of the plate is recorded as the modulation to the carrier frequency. After optical filtering the
modulated carrier is input into a digital image processing system to generate a grey image of ‘deformed grating’, whose digital
differentiation can be used to obtain the curvature patterns or the twist patterns. |
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Keywords: | fringe carrier slope modulation optical filtering digital image processing |
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