Abstract
Interferometric systems for the measurement of rotational vibration have been available for some time, based on the simple Michelson set-up. Both beams must be used to generate the rotation sensitivity and eliminate linear vibration signals. Because both beams impinge on the surface, and are thus drastically attenuated, the interferometric signals is extremely weak, and only truly useful on specially treated surfaces Here we present a system utilising a purpose-built twin interferometer which provides improved sensitivity and, due to the heterodyne configuration, the capability to measure at zero dc rotation with directional information.
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