Improvement method of measuring object deformation by using double-exposure with gray-level
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Institute of Laser, School of Science, Kunming University of Science and Technology, Kunming 650093, China
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Corresponding author:
GONG Ai-ling, ailinggong@sina.com
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Received Date:
2010-11-30
Accepted Date:
2011-01-29
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Abstract
The usual method for recording and processing hologram images is digital holography, which is also suitable for double-exposure to measuring object deformation. However, the deformation near half of the optical wavelength is based on phase-shift method, and it needs more than three hologram images. In order to simplify the method, the double-exposure with gray-level was extended to measure deformation. By using the gray-level, with the image of gray-level distributions, the fringe numbers can be calculated and then the out-of-plane displacement was obtained. This method only needs take two images. Through theoretical analysis and experimentation, the result is satisfactory, which show this method works well in a certain extent.
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