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We report the experimental work on Fiber Bragg Grating (FBG) geophone with cantilever beam structure which was developed recently. Factors of effecting sensitivity are discussed. The testing system of acceleration sensitivity was established. The FBG geophone's sensitivity responses in different frequency were tested to verify the design. Experiments of FBG geophone with different damping are given...
A highly sensitive contact type fiber Bragg grating dynamic pressure sensor was designed to achieve the detection of pulse wave information in this paper. The sensitivity and frequency range of the sensor were analyzed by using the finite element method. A sensing system based on the fiber Bragg grating pressure sensor and interferometric wavelength demodulating based on phase generated carrier (PGC)...
The multiplexed fiber Bragg grating (FBG) micro seismic monitoring system with high sensitivity based on wavelength division multiplexing (WDM) and narrow line-width laser filtering demodulation is introduced. The highly sensitive acceleration probe based on FBG and a kind of cantilever structure is used in the system. The wavelength dynamic change of FBG is interrogated by narrow line-width laser...
A method to interrogate fibre Bragg grating vibration sensor by narrow line width light is demonstrated; the interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as distributed feedback laser, when a reflection or transmission spectrum curve of an FBG moves due to the strain which applied on the sensor. The sensor's response to acceleration frequency...
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