Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-04-10
1991-03-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356345, H01J 516
Patent
active
050013378
ABSTRACT:
A fiber optic geophysical sensor in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects.
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Allen Stephone B.
Gaetjens Paul D.
Moser William R.
Nelms David C.
The United States of America as represented by The United States
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