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Crack sensing system and method based on distributed short-gauge optical fiber strain sensor

An optical fiber strain and sensing method technology, applied in instruments, measuring devices, optical devices, etc., can solve the problems of poor sensitivity of small cracks, difficult to accurately quantify cracks, difficult to identify with certainty, etc., and achieves low production cost, simple structure, The effect of accurate crack width measurement

Active Publication Date: 2021-08-27
SOUTHEAST UNIV
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Problems solved by technology

However, various distributed strain sensing technologies based on the principle of Brillouin scattering still have poor sensitivity to tiny cracks, it is difficult to identify crack signals with confidence, and it is difficult to accurately quantify cracks. monitoring objects and other issues

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  • Crack sensing system and method based on distributed short-gauge optical fiber strain sensor

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Embodiment Construction

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0062] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "left side", "right side", "upper", "lower" are based on the orientations or positional relationships shown in the accompanying drawings, and are only For the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, "first", "second" and the like do not represent components importance, and therefore should not be construed as limiting the invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present in...

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Abstract

The invention discloses a crack sensing system and method based on a distributed short-gaugeoptical fiber strain sensor. The system comprises a distributed short-gaugeoptical fiber strain sensor and a standard Brillouin optical fiber demodulation device, wherein the distributed short-gauge optical fiber strain sensor is arranged on the surface or in a monitoring structure, brillouin gain spectrum data of different monitoring sections in different periods are read through the demodulation device, early warning and positioning are performed on a crack according to the crack fingerprint features of the gain spectrum, signal processing is performed on the crack section gain spectrum, the center frequency of each peak is determined through a peak-dividing fitting algorithm, and the crack width is calculated through the center frequency of each peak of the gain spectrum. According to the invention, the inherent performance limit of standard Brillouin demodulation equipment is broken through, comprehensive early warning and accurate quantitative evaluation of various structural cracks are realized, long-term monitoring of ultra-long-distance cracks is conveniently and economically realized, and order-of-magnitude reduction of monitoring cost and order-of-magnitude improvement of monitoring effect are realized.

Description

technical field [0001] The invention relates to the technical field of intelligent sensing and monitoring, in particular to a crack sensing system and method based on distributed short gauge optical fiber strain sensors. Background technique [0002] Various civil engineering infrastructures will form structural cracks due to various reasons such as aging, fatigue, unfavorable loads or external environment during operation. The development of structural cracks will inevitably affect the function, aesthetics, durability and even safety of various infrastructures. Therefore, the early detection and quantitative evaluation of structural cracks is crucial for the structural operation and maintenance of various civil engineering infrastructures. [0003] However, early structural cracks are often tiny and occur randomly in a sporadic distribution. Due to the huge scale of civil engineering infrastructure, the current point-based and quasi-distributed traditional sensor monitori...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01B11/02
CPCG01B11/16G01B11/02
Inventor 韩天然吴刚
Owner SOUTHEAST UNIV
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