Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2008-05-20
2008-05-20
Connolly, Patrick (Department: 2877)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
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.
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patent: 2007/0280693 (2007-12-01), Meyer
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“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.
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Chang Chun-Long
Hsu Heng-Shan
Huang Shih-Chu
Lin Hermann
Tsay Jiunn-Song
Connolly Patrick
Jianq Chyun IP Office
Shin-Chu Huang
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