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High durability optical fiber grating wash out sensor

A fiber grating and durability technology, which is applied in the field of quantitative monitoring and scouring sensors, can solve the problems of unsuitable long-term real-time monitoring and complicated operation of traditional methods, and achieve the effect of convenient wiring and saving frequency of use.

Inactive Publication Date: 2009-09-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the traditional method is complicated to operate and is not suitable for long-term real-time monitoring. Therefore, it is one of the important problems to be solved in engineering to develop a sensor monitoring system for foundation soil scour using new sensitive components.

Method used

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  • High durability optical fiber grating wash out sensor
  • High durability optical fiber grating wash out sensor
  • High durability optical fiber grating wash out sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Combine figure 1 This embodiment includes the following structure: a metal housing 1 and a measuring part connected to the metal support 3 on the top of the metal housing 1, which is composed of two fiber gratings 4 attached to the upper and lower surfaces of the FRP equal-strength beam 2. This structure It can realize the self-compensation of temperature while ensuring the strain monitoring of the fiber grating; the outside of the measuring part is a protective metal shell; the inner wall of the metal shell 1 is provided with a metal baffle 5, and a small amount of calcium carbide 6 is placed on it to ensure the measurement The part has enough gas protection to improve the tightness of the measurement part; to set the reset element, two options can be selected according to the different range: one is to have a reset bolt 7 under the baffle, and the other is to preset on the outer wall of the metal shell A pre-compression sleeve uses a reset element to reset the FRP beam o...

Embodiment 2

[0051] Combine figure 2 The basic structure of this embodiment is the same as that of Embodiment 1. The difference is that the second solution is used for resetting in this embodiment, that is, a pre-compression sleeve 11 is preset on the outer wall of the metal shell.

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Abstract

The invention provides a high-durability fiber grating scour sensor. It includes a metal casing and a measuring part set in the metal casing and connected to the metal casing. The measuring part is composed of an FRP equal-strength beam and two fiber gratings attached to the upper and lower surfaces of the FRP equal-strength beam. The lead wire of the fiber grating passes through the metal The shell is drawn out. The inner wall of the metal shell is provided with a metal baffle, and calcium carbide is set on it. A dowel bar is set under the metal shell. The other end is provided with an FRP disc. The scour sensor has the advantages of high precision, convenient layout, adjustable range and resolution, etc., and is suitable for foundation soil scour monitoring of civil engineering structure health monitoring and foundation soil scour monitoring of structural tests.

Description

(1) Technical field [0001] The invention relates to a quantitative monitoring technology for civil engineering and water conservancy projects, in particular to a quantitative monitoring scour sensor. (2) Background technology [0002] Structural health monitoring is of great significance to ensure the long-term safe operation of the structure. In hydraulic and civil engineering, the degree of soil erosion near the structural foundation under the action of water current is one of the damage problems that cause concern. The foundation soil supports the entire structure through the foundation and bears all the weight and vertical loads of the structure. The loss of a large amount of foundation soil not only has a great impact on the durability of the structure, but also affects the safety of the structure. For example, during floods, the erosion of bridge crossings near the foundations of bridge piers and abutments is one of the common causes of bridge failure. If we can grasp the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01D5/38G01B11/22G02B6/34
Inventor 刘鲲周智何俊何建平欧进萍
Owner HARBIN INST OF TECH
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