Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-05-03
1995-03-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356345, G01B 902
Patent
active
053978919
ABSTRACT:
One or more optical fiber gratings are used to sense environmental effects that can vary the spacing between the lines of the grating to vary the center frequency of the spectral envelope, either reflected or passed thereby. Light of the sensor grating's spectral envelope is transmitted to a local optical filter unaffected by the environmental effect and compared with the spectral envelope of the local optical filter to produce an intensity modulated signal, which is detected to sense the environmental effect. The sensor systems so constructed may have one or more local optical filters and those local optical filters may be modulated to reduce the effects of noise, broaden the dynamic range, vary the sensitivity or discriminate in a multiplexed embodiment. The system can be operated either open or closed loop. In addition, the fiber grating may have multiple gratings at the same location so that different kinds of effects or effects from different directions can be sensed from a single location.
REFERENCES:
patent: 4223977 (1980-09-01), Papuchon et al.
patent: 4881817 (1989-11-01), Kim et al.
patent: 4885462 (1989-12-01), Dakin
patent: 4898468 (1990-02-01), Udd
patent: 5046848 (1991-09-01), Udd
Clark Timothy E.
Udd Eric
Allen Stephone B.
McDonnell Douglas Corporation
Nelms David C.
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