Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2008-04-08
2008-04-08
Monbleau, Davienne (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S227230, C385S012000
Reexamination Certificate
active
11568344
ABSTRACT:
An optical sensing system uses light scattered from a sensing fibre to sense conditions along the fibre, and has a receiver with a frequency to amplitude converter to obtain a frequency of a Brillouin component of the received scattered light, to deduce the conditions. This converter can avoid time consuming scanning of frequencies to obtain the Brillouin frequency spectrum, and avoids the heavy processing load of deducing a peak or average frequency from the spectrum. The converter can be implemented in the optical domain using a grating or interferometer, or in the electrical domain using a diplexer or electrical interferometer. It can generate complementary signals, having opposite signs, a ratio of these signals representing the frequency. This can avoid sensitivity to amplitude changes in the received scattered signals and provide common mode rejection of noise.
REFERENCES:
patent: 6380534 (2002-04-01), Farhadiroushan
patent: 2001/0050768 (2001-12-01), Uchiyama
patent: 2002/0040936 (2002-04-01), Clayton
patent: 2002/0041722 (2002-04-01), Johnson
Farhadiroushan Mahmoud
Shaw Barry John
Watley Daniel Andrew
Barkume, P.C. Anthony R.
LeGasse, Jr. Francis M
Monbleau Davienne
Sensornet Limited
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