Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-04-17
1993-09-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023119, H01J 4014
Patent
active
052471713
ABSTRACT:
An improved intensity-encoded fiber optic sensor incorporating novel drift correction and filtering means is disclosed. The first embodiments of the invention relate to means for removing unwanted higher-order core and cladding modes from an intensity-encoded signal in an optical fiber using mode strippers and mode filters located strategically at various points in the sensing system. The second set of improvements in the invention relate to an improved technique for long-term temporal drift cancellation in a fiber optic pressure sensor by periodically applying pressure to the sensor tip in order to ascertain the measured voltage at which the sensor diaphragm contacts other elements of the sensor. This measured voltage is subtracted from an initial calibration voltage, and the result is applied to the measured signal as a constant correction term.
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Coletta Luciano
Danielson David
Tomasko Doug
Van Ochten Mitch
Velazquez Juan
Fiberoptic Sensor Technologies, Inc.
Lee John R.
Nelms David C.
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