Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1983-11-03
1987-02-03
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
356 285, G01J 336, G01J 1300, G01J 1500
Patent
active
046406182
ABSTRACT:
A relative position sensor is suitable for inertial navigation situations in which deviations from a predetermined position schedule are detected. A standing wave is established between a pair of opposed phase conjugate reflectors in a resonating cavity, and relative movement between the standing wave and the cavity is sensed. Since the standing wave continues to travel at its initial velocity regardless of deviations from that velocity by the resonator, deviations in the position of the resonator relative to its projected position based on the initial velocity can be measured. In a preferred embodiment, four-wave mixers are used as the phase conjugate reflectors, the phase conjugate medium within the mixers is made coextensive with the wave propagation medium between the mixers, and relative movement is sensed by monitoring the intensity of the standing wave at at least one location which is fixed relative to the resonator.
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Giuliano, Applications of Optical Phase Conjugation, Physics Today, p. 27 (Apr. 1981).
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Khoshnevisan Mohsen
Tracy John M.
Yeh Pochi A.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
Turner S. A.
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