NASA NTRS · 19760000502
Servo corrects interferometer-mirror tilt
Abstract
Three detectors sense He-Ne laser beam; one senses reference phase while others, at right angles to first, sense phase offset for each axis. Analog output of axis detectors is multiplied separately by reference output to give X and Y error signals that are then fed to respective X and Y actuators.
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Schindler, R. A.. 1977-03-01. Servo corrects interferometer-mirror tilt. https://ntrs.nasa.gov/citations/19760000502
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