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The method of using holography with the recorded beams modulated by the plate motion to measure 3D displacement is proposed. Displacements of the plate are determined by the reference object. Image signal is processed with PDS microdensitometer.
Yunliang Cai
"Modulated beams holography and signal processing", Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12305Y (1 July 1990); https://doi.org/10.1117/12.2294851
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Yunliang Cai, "Modulated beams holography and signal processing," Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12305Y (1 July 1990); https://doi.org/10.1117/12.2294851