A document discusses a mechanism that uses flex-pivots in a parallelogram arrangement to provide frictionless motion with an unlimited lifetime. A voice-coil actuator drives the parallelogram over the required 5-cm travel. An optical position sensor provides feedback for a servo loop that keeps the velocity within 1 percent of expected value. Residual tip/tilt error is compensated for by a piezo actuator that drives the interferometer mirror.
This work was done by Jean-Francois L. Blavier, Matthew C. Heverly, Richard W. Key, and Stanley P. Sander of Caltech for NASA’s Jet Propulsion Laboratory. NPO-47317
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Optical-Path-Difference Linear Mechanism for The Panchromatic Fourier Transform Spectrometer (reference NPO-47317) is currently available for download from the TSP library.
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