Title: Optical fiber raster vibration sensor of tunable matching filtering demodulation
Application Number: 200510019733 Application Date: 2005.11.03
Publication Number: 1752729 Publication Date: 2006.03.29
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01M7/02,G01H9/00
Applicant(s) Name: Wuhan Univ. of Technology Address: 430070
Inventor(s) Name: Jiang Desheng, Zhang Dongsheng Gao Pian
Attorney & Agent: wang yuhua
Abstract:
     The invented optical-fibre grating vibration sensor is characterized by that it utilizes a demodutation grating and a sensing grating and makes them be series-connected together, and respectively makes them be stuck on a main beam and an auxiliary beam, two beams are made of identical material and have identical heat expansion coefficient, so that their central wavelengths can be synchronously shifted with temperature, therefore they have automatic temperature compensation function so as to implement matching filter demodutation. Said invention utilizes the detection of light intensity change of sensing grating reflecting light to monitor the parameters of vibration frequency and vibration amplitude of monitored body, finally utilizes computer or single-chip computer to make analysis and processing of body vibration frequency spectrum.
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