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Flexible high-temperature raster strain foil for two-dimensional stress detection

A two-dimensional strain and strain gauge technology, applied in measurement devices, optical devices, instruments, etc., can solve the problem that fiber grating strain gauges cannot detect two-dimensional strains, and achieve quasi-distributed multi-point measurement, low cost, Sensitive effect

Inactive Publication Date: 2014-08-06
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to solve the deficiency that traditional fiber grating strain gauges cannot perform two-dimensional strain detection, and provide a device capable of two-dimensional surface strain detection. At the same time, the device has the characteristics of flexibility and high temperature resistance, and has the function of temperature compensation , especially suitable for structural health detection of high-temperature pressure pipelines

Method used

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  • Flexible high-temperature raster strain foil for two-dimensional stress detection
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  • Flexible high-temperature raster strain foil for two-dimensional stress detection

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] combine figure 1 , the present invention is a kind of high-temperature-resistant fiber grating strain gauge capable of detecting two-dimensional strain on the surface of complex components, which is composed of a "ten"-shaped metal sheet substrate (4), a high-temperature Bragg grating A (1), a high-temperature Bragg grating B (2 ), high temperature Bragg grating C (3) and high temperature resistant cover layer (5); the three high temperature Bragg gratings are fixed on the substrate (4) by high temperature glue, and the high temperature resistant cover layer (5) is pasted on the three by high temperature glue only on the high temperature Bragg grating; the optical serial connection between the three high temperature Bragg gratings has different characteristic wavelengths; the fiber Bragg grating strain gauge is fixed on the surface of the component at the weldin...

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Abstract

The invention belongs to the technical field of fiber bragg grating and relates to a flexible high-temperature raster strain foil for two-dimensional stress detection on surfaces of complicated members. The flexible high-temperature raster strain foil is composed of a 'cross'-shaped or 'T'-shaped high-temperature constant-elasticity alloy substrate, a high-temperature bragg grating A, a high-temperature bragg grating B, a high-temperature bragg grating C and a high-temperature-resistant coverage layer. The high-temperature brag gratings are transversely and longitudinally fixed on the substrate by high-temperature adhesives, two ends of the high-temperature bragg grating A and the high-temperature bragg grating B are fixed by the high-temperature adhesives, transverse stress and longitudinal stress are respectively measured, and a single end of the high-temperature bragg grating C is free and can only sense temperature changes so as to realize temperature compensation. During application, the flexible high-temperature raster strain foil is welded or adhered on the surface of a meter to be detected. The flexible high-temperature raster strain foil is high-temperature resistant, flexible, resistant to electromagnetic interference and convenient to mount and is applicable to two-dimensional stress detection of the surfaces of the complicated members and capable of realizing distributed multi-point measurement.

Description

technical field [0001] The invention belongs to the field of optical fiber grating sensing technology, in particular to a flexible high-temperature grating strain gauge for detecting two-dimensional strain on the surface of a component. 2D strain detection. Background technique [0002] Resistance strain gauges are traditional sensitive elements for strain measurement in engineering structures or component tests. At present, the most widely used metal foil strain gauge is the metal foil strain gauge with various strain resistance alloy foils as the sensitive grid. It is widely used in the strain measurement of engineering structures or components due to its advantages of convenient manufacture, low price, easy use and reliable measurement. . However, this kind of electrical sensor represented by metal foil resistance strain gauge has many shortcomings in the field of strain measurement. It is very dangerous when it is applied; electrical sensors are susceptible to electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 刘月明高晓良蔡庆木吴刚夏忠诚
Owner CHINA JILIANG UNIV
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