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: 2008-03-12
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] In conjunction with Fig. 1, this embodiment includes the following structure: a metal casing 1 and a measuring part connected to the metal support 3 on the top of the metal casing 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 can realize temperature self-compensation while ensuring that the fiber grating monitors the strain; the outside of the measuring part is a protective metal casing; the inner wall of the metal casing 1 is provided with a metal baffle 5, and a small amount of calcium carbide 6 is placed on it for use In order to ensure that the measuring part has sufficient gas protection and improve the sealing of the measuring part; setting the reset element, two options can be selected according to the different ranges: one is a reset bolt 7 under the baffle, and the other is in the metal A pre-compression sleeve is preset on the outer wall of the shell, and the reset element ...

Embodiment 2

[0051] Referring to FIG. 2 , the basic structure of this embodiment is the same as that of Embodiment 1, except that the reset of this embodiment adopts the second solution, that is, a pre-compression sleeve 11 is preset on the outer wall of the metal casing.

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Abstract

The invention provides a high-durability fiber grating scouring sensor which comprises a metal shell and a measuring part arranged in the metal shell and connected with the metal shell, wherein the measuring part is composed of a FRP uniform strength beam and two fiber gratings stuck on the upper and lower surfaces of the FRP uniform strength beam, the leading-out wire of the fiber grating passes through the metal shell and is educed, the inner wall of the metal shell is provided with a metal baffle plate provided with a calcium carbide, the lower part of the metal shell is provided with a dowel bar, a prepressing small-rigidity spring is arranged between one end of the dowel bar and the inner wall of the metal shell, and the other end of the dowel bar is provided with a FRP disc. The scouring sensor has the advantages of the high precision, the convenient arrangement and the adjustable range and resolution, and is applied to the foundation soil scouring monitoring of health monitoring of civil engineering structure and the foundation soil scouring monitoring of structural test.

Description

(1) Technical field [0001] The invention relates to a quantitative monitoring technology for civil 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 structures, and the degree of loss of foundation soil near the structural foundation under the action of water flow in hydraulic civil engineering is one of the most concerned damage issues. The foundation soil supports the entire structure through the foundation and bears all the weight and vertical load 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 even affects the safety of the structure. For example, during floods, bridge scour near the bridge pier foundation is one of the common causes of bridge failure. If we can grasp the information of the degree of water erosion of th...

Claims

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Application Information

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Patent Type & Authority Applications(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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