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13 September 2012 A 14-channel multipoint vibrometry system using dynamic holography
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We report on a new system for measuring the vibration simultaneously at multiple positions (multipoint vibrometry) using multiple individual channels, each consisting of a complete heterodyne interferometer. The core element for controlling the three-dimensional position of the measurement spots is a liquid crystal on silicon (LCoS) HDTV spatial light modulator. Unwanted modulation effects, especially unwanted diffraction orders and crosstalk effects are taken into account for the design of the optical system and the computation of the holograms. We present a general discussion with an emphasis on the LCoS related considerations and first measurement results.
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Tobias Haist, Christian Lingel, Wolfgang Osten, Marcus Winter, Moritz Giesen, and Christian Rembe "A 14-channel multipoint vibrometry system using dynamic holography", Proc. SPIE 8494, Interferometry XVI: Applications, 849406 (13 September 2012);

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