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1.3 PHYSICAL SCIENCES, Optics
A photopolymer holographic grating is used to produce the two sheared images in an electronic speckle pattern shearing interferometer. A ground glass screen following the grating serves the purpose of eliminating unwanted diffraction orders and to remove the requirement for the CCD camera to resolve the diffraction grating’s pitch. The sheared images on the ground glass are further imaged onto the CCD camera. The fringe pattern contrast was estimated to be above 90%. A validation of the system was done by comparing the theoretical phase difference distribution with the experimental data from the three point bending test.
Mihaylova, E., Naydenova, I., Martin, S., Toal, V.: Electronic spackle pattern shearing interferometer with a photopolymer holographic grating. Applied Optics, 43 (12), 2439, 2004.