A multichannel heterodyne fiber optic vibrometer is demonstrated which can be operated\nat ranges in excess of 50 m. The system is designed to measure periodic signals, impacts, rotation, 3D\nstrain, and vibration mapping. The displacement resolution of each channel exceeds 1 nm. The\noutputs from all channels are simultaneous, and the number of channels can be increased by using\noptical switches.
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