Optics: measuring and testing – Material strain analysis
Patent
1981-09-30
1984-10-09
Punter, William H.
Optics: measuring and testing
Material strain analysis
73800, 356349, G01B 1116, G01B 902
Patent
active
044758120
ABSTRACT:
An optical sensor has a gain medium situated at a first location and defines one end of a resonating optical cavity. An optical fiber couples electromagnetic radiation to a predetermined point at a second location where it is directed toward a reflective surface. The physical condition to be sensed causes the reflective surface to move with respect to the end of the optical fiber. This movement essentially changes the length of the cavity in which the electromagnetic energy is resonating causing a corresponding change in the axial mode difference frequency within the cavity. A small portion of electromagnetic energy is coupled out of the cavity at the first location to a photodetector. Finally, the photodetector creates an electrical signal which varies as the change in the axial mode difference frequency, thus indicating the change in the physical condition.
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Belek Ronald E.
Buczek Carl J.
Beers Robert F.
Lange Richard P.
Lesniak Andrew M.
Punter William H.
The United States of America as represented by the Secretary of
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