A 14-channel multipoint vibrometry system using dynamic holography

摘要

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. Thecore 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 andcrosstalk 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 measurementresults.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.