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The use of speckle pattern interferometry to detect vibration modes was reported by Archbold et al. [1], and by several others [2,3] to detect vibration amplitudes. TV detec-tion and electronic filtering have been added [4-6]to give a more flexible system: ESPI.
Ole J. Lokberg andKare Hogmoen
"Holographic Methods Made Useful By Phase Modulated ESPI", Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); https://doi.org/10.1117/12.956163
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Ole J. Lokberg, Kare Hogmoen, "Holographic Methods Made Useful By Phase Modulated ESPI," Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); https://doi.org/10.1117/12.956163