Distributed high-sensitivity vibration detection system and method based on ultra-short fiber grating array
A technology of fiber grating array and fiber grating, which is applied in the field of sensing, can solve the problem of insufficient sensitivity, and achieve the effects of high detection accuracy, avoiding visibility degradation, and high signal-to-noise ratio
Active Publication Date: 2019-01-29
WUHAN UNIV OF TECH
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[0005] The technical problem to be solved by the present invention is to provide a distributed high-sensitivity vibration detection system and method based on ultra-short fiber grating arrays with high detection accuracy for the defect that the sensitivity in the prior art is not high enough
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[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0037] Such as figure 1 As shown, the distributed high-sensitivity vibration detection system based on the ultrashort fiber grating array of the embodiment of the present invention includes a laser light source 1, a modulation and amplification unit, a circulator 5 and an ultrashort fiber grating array 6 connected in sequence, and on the circulator 5 A coupler 7 is also connected;
[0038] The system also includes a matching interferometer 8 connected to the coupler 7 and a reflected light detection unit, and the two output ports of the coupler 7 are respectively connected to two arms of the match...
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The invention discloses an ultrashort optical fiber grating array-based distributed high-sensitivity vibration detection system and an ultrashort optical fiber grating array-based distributed high-sensitivity vibration detection method. The ultrashort optical fiber grating array-based distributed high-sensitivity vibration detection system comprises a laser light source, a modulation amplifying unit, a circulator and an ultrashort optical fiber grating array which are connected with one another sequentially, wherein the circulator is connected with a coupler; the system also comprises a matching interferometer connected with the coupler, and a reflected light detection unit; two output ports of the coupler are respectively connected with two arms of the matching interferometer; the matching interferometer is corresponding to the ultrashort optical fiber grating array and is used for receiving reflected light which has passed through the ultrashort fiber grating array; and the reflected light detection unit detects received reflected light. The ultrashort optical fiber grating array-based distributed high-sensitivity vibration detection system and method of the invention have high detection accuracy and higher signal to noise ratios. With the system and method adopted, the distributed measurement of high-sensitivity vibration signals can be realized, and the problem of the decrease of the visibility of interference fringes caused by spectral mismatch can be avoided.
Description
technical field [0001] The invention relates to the field of sensing technology, in particular to a distributed high-sensitivity vibration detection system and method based on an ultrashort fiber grating array. Background technique [0002] Optical fiber sensing has a series of unique advantages such as being immune to electromagnetic interference, long transmission distance, and easy to form a distributed sensing network. In recent years, there have been a lot of reports on the application in the fields of structural health monitoring, perimeter security, fire alarm, and seismic wave monitoring. , High performance, intensification and networking have become the development direction of optical fiber sensing. [0003] Fiber Bragg grating sensing is a sensing technology that has developed rapidly in recent years. Its advantages are fast response, multiple measurement parameters, and strong flexibility. Traditional fiber grating sensing adopts wavelength division multiplexing...
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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 文泓桥刘胜
Owner WUHAN UNIV OF TECH