Distributed sensing optical fiber acoustic emission control device and method for perceiving structural performance degradation

Abstract

The invention discloses a perceptual structural performance degradation distributed type sensor fiber acoustic emission regulating and controlling device which comprises an inner supporting body, mesh modules, fiber carrying modules and rotary connecting modules. A cylinder shape is formed by the inner supporting body, the mesh module and the fiber carrying module, the section of the inner supporting body is in a quadrangular inward concave shape with four inwards concave edges, the four faces of the inner supporting body are concave faces, the mesh modules with a plurality of meshes are arranged in the four concave faces of the inner supporting body, one fiber carrying module is arranged between every two adjacent mesh modules, and sensing fibers are arranged in the fiber carrying modules. According to the perceptual structural performance degradation distributed type sensor fiber acoustic emission regulating and controlling device and method, the multiform meshes such as the round meshes, the triangular meshes, the quadrangular meshes and the pentagonal meshes are used for forming acoustic emission co-cavity holes, and multistage time delay of the multiple acoustic emission wave co-cavity holes based on the distributed sensing fibers at the multistage physical size and monitoring at multi-acoustic-wave vibration frequency are constructed.

Description

technical field [0001] The invention relates to a distributed sensing optical fiber acoustic emission control device and method for sensing structural performance degradation, and belongs to the field of water engineering structure health monitoring. Background technique [0002] After more than 30 years of development, optical fiber sensing technology has made great progress. Many practical products and technologies have emerged, and a relatively independent system has basically been constructed. However, with the continuous development of society and technological progress, The demand for optical fiber sensing technology is also increasing, and the performance parameters are also showing a trend of diversification and high standards. Therefore, the status quo of optical fiber sensing technology is still far from meeting the actual needs, and a lot of research work is needed; [0003] The acoustic emission signal is a phenomenon in which a local area of ​​a material is affe...

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Problems solved by technology

[0004] For the traditional piezoelectric ceramic acoustic emission detection method, its technology is mature and its operation is simple, but there are many disadvantages, such as relatively large system, too many cables, and poor ability to resist electrical interference. Therefore, a new type of acoustic emission detection method has been developed. Fiber Bragg grating-type acoustic emission detection system has high sensitivity and strong anti-electromagnetic interference ability, but this method also has serious problems. It still belongs to the current relatively traditional point-type monitoring, which is far from meeting the requirements of current large-scale structures. , wide monitoring range, long-distance transmission and other issues, so it is necessary to develop a new type of distributed sensing fiber-optic acoustic emission detection system. When developing this kind of distributed acoustic emission detection, it is necessary to first develop a The system is integrated with supporting devices to finally complete the development of a distributed sensing optical fiber acoustic emission detection system. The secondary processing and layout of sensing optical fibers is a necessary device in practical engineering. For this reason, a sensing structure has been developed. Performance degradation distributed sensing optical fiber acoustic emission control device and method

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