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Distributed long gauge length optical fibre Bragg optical grating strain sensor and mfg. process thereof

A fiber Bragg and grating strain technology, applied in the coupling of optical waveguides, etc., can solve the problems of difficult structure detection, inability to effectively capture structures, failures, etc., to help durability and long-term stability, easy on-site installation, volume small effect

Active Publication Date: 2007-04-18
江苏绿材谷新材料科技发展有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The overall monitoring sensors represented by accelerometers have been relatively mature, but a large number of research and engineering practice have shown that the overall monitoring method based only on modes (frequency, mode shape, etc.) is still facing great challenges in structural damage diagnosis and parameter identification. Difficulties
The local monitoring based on stress (strain), on the one hand, the stability and durability of the corresponding sensors are far from meeting the needs of long-term monitoring of the structure; Cracks appear and fail, and it is not practical to distribute them on large-scale civil structures. However, if the local damage in the structure does not appear within the test range of the installed sensors, it is difficult to be accurately detected, so that it cannot be effectively captured. structural damage

Method used

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  • Distributed long gauge length optical fibre Bragg optical grating strain sensor and mfg. process thereof
  • Distributed long gauge length optical fibre Bragg optical grating strain sensor and mfg. process thereof
  • Distributed long gauge length optical fibre Bragg optical grating strain sensor and mfg. process thereof

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Embodiment Construction

[0104] The strain sensor is composed of a plurality of long-gauge fiber Bragg grating 1 strain sensors in series; wherein a single long-gauge fiber Bragg grating 1 is connected to a single-mode optical fiber 2 with the coating removed at both ends of the fiber Bragg grating 1, and The outside of the fiber Bragg grating 1 and the single-mode optical fiber 2 with the coating removed is covered with a sleeve 6, and the two ends of the sleeve 6 are respectively fixed on the single-mode optical fiber 2 with the coating removed through the fixing points 7 between the optical fiber and the sleeve. The two ends of the single-mode optical fiber 2 from which the coating layer has been removed are respectively connected to the external single-mode optical fiber cable through fusion points 8, and the composite material encapsulation layer 9 is coated on the outside of the above structure. The surface of the fiber Bragg grating 1 is coated with a first heavy coating 11, the surface of the s...

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Abstract

The invention relates to distributivity long gauge length optical fiber Prague grating strain gage and its manufacturing method. It is formed by many long gauge length optical fiber Prague grating strain gages with series connection. The two ends of the each long gauge length optical fiber Prague grating are respectively connected with mono-mode fiber without coating. Their outer is hitched by annular tube of which two ends are fixed on the mono-mode fiber respectively by optical fiber and annular tube, which two ends are connected with outer mono-mode fiber optical cable by welding point. Composite material packaging layer is covered at the outside of the above structure.

Description

technical field [0001] The invention relates to a distributed long-scale optical fiber Bragg grating strain sensor for health detection and monitoring of structural facilities and a manufacturing method thereof, belonging to the technical field of optical fiber strain sensor manufacturing. Background technique [0002] Structural health monitoring includes overall and local monitoring. The overall monitoring sensors represented by accelerometers have been relatively mature, but a large number of research and engineering practice have shown that the overall monitoring method based only on modes (frequency, mode shape, etc.) is still facing great challenges in structural damage diagnosis and parameter identification. Difficulties. The local monitoring based on stress (strain), on the one hand, the stability and durability of the corresponding sensors are far from meeting the needs of long-term monitoring of the structure; Cracks appear and fail, and it is not practical to di...

Claims

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Application Information

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IPC IPC(8): G02B6/34G02B6/24
Inventor 吴智深李素贞
Owner 江苏绿材谷新材料科技发展有限公司
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