Counting signal processing method for fiber optic...

Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C385S012000

Reexamination Certificate

active

07375817

ABSTRACT:
A counting signal processing method for a fiber optic interferometric sensor including following steps is provided. An output intensity of the fiber optical interferometric sensor is converted into an electrical signal having the form V0+V1cos ψ(t). Then, the number of times N1that the maximum peak values are greater than a first counting level S1and the number of times N2that the minimum peak values are smaller than a second counting level S2within a specific period of time TCare counted. When the value of N1, N2or (N1+N2) is greater than a threshold counting number Cth, a detectable induced signal occurring in a sensing area is inferred. Then, whether the detectable induced signals are caused by an intruder or otherwise is judged through an alarm identification logic, and an alarm device is triggered to send out an alarm according to the result of the judgment.

REFERENCES:
patent: 5012088 (1991-04-01), Cole et al.
patent: 2007/0280693 (2007-12-01), Meyer
“Elimination of drift in a single-mode optical fiber interferometer using a piezoelectrically stretched coiled fiber” submitted by Jackson et al., Applied Optics/ vol. 19, No. 17 / Sep. 1, 1980, pp. 2926-2929.
“Homodyne Demodulation Scheme for Fiber Optics Sensors Using Phase Generated Carrier” submitted by Dandridge et al., IEEE Journal of Quantum Electronics, vol. QE-18, No. 10, Oct. 1982, pp. 1647-1653.
“Polarisation-Insensitive Fibre Optic Michelson Interferometer” submitted by Kersey et al., Electronic Letters Mar. 14, 1991 vol. 27 No. 6, pp. 518-520.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Counting signal processing method for fiber optic... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Counting signal processing method for fiber optic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Counting signal processing method for fiber optic... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2811985

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.