We present a new type of system for measuring the vibration simultaneously at multiple positions (multipoint vibrometry) using multiple (at the moment 14) individual channels, each consisting of a complete heterodyne interferometer. Control of the three-dimensional position of the measurement positions is achieved using dynamic holography implemented by a liquid crystal on silicon (LCoS) spatial light modulator. Compared to full field vibration measurement techniques like ESPI, a high temporal bandwidth in combination with a high dynamic range is achieved for the interference signal. Transient phenomena at different points can be acquired. We analyse the system concerning the light efficiency and show first experimental results.
Advanced multipoint vibrometry using spatial light modulators
Tobias Haist, Christian Lingel, Wolfgang Osten, Marcus Winter, Moritz Giesen, Frank Ritter, Christian Rembe; Advanced multipoint vibrometry using spatial light modulators. AIP Conf. Proc. 13 June 2012; 1457 (1): 234–241. https://doi.org/10.1063/1.4730562
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