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.
Servo corrects interferometer-mirror tilt
NASA Tech Briefs ; 1 , 4
1977-03-01
Miscellaneous
No indication
English
Computer corrects wagon wastage
Engineering Index Backfile | 1964
|Improved servo for a michaelson interferometer
NTRS | 1979
|Development of dynamic tilt control method and servo algorithm in gap servo NFR
British Library Online Contents | 2009
|