Fiber grating distributed strain sensor and strain monitoring method thereof
A technology of distributed strain and optical fiber grating, which is applied in the direction of using optical devices to transmit sensing components, transmission monitoring/testing/fault measurement systems, cladding optical fibers, etc., and can solve difficult to realize networking, complex demodulation algorithms, system structure Complicated problems, to achieve high spatial resolution positioning and improve measurement accuracy
Active Publication Date: 2011-05-11
杭州光学精密机械研究所
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The invention relates to a fiber grating distributed strain sensor and a strain monitoring method thereof, which are characterized in that an erbium-doped fiber amplifier is added into an optical fiber fading cavity to form an active fading cavity, and an optical pulse fading sequence is obtained, so the positioning accuracy of submillimeter-magnitude spatial length measurement can be realized; and a wavelength of a tunable laser is in one-to-one correspondence with positioning data of fiber grating bragg reflection space by taking a linear chirped fiber grating or a uniform fiber grating as a sensing device, and the corresponding local strain capacity is demodulated by positioning the variable quantity of a local bragg reflection wavelength to realize distributed strain sensing. In the fiber grating distributed strain sensor, the spatial resolution ratio is improved to a submillimeter magnitude by a direct time domain measurement method, and the fiber grating distributed strain sensor has a compact structure and simple algorithm, can perform on-line monitor in real time and can be used for networking, so that the fiber grating distributed strain sensor has the large application space in the field of optical fiber sensing.
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