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A strain measurement method based on optical fiber sensor in high temperature environment

A fiber optic sensor and strain measurement technology, applied in the field of testing, to achieve the effects of improving accuracy, offsetting hidden error sources, and uniform temperature field distribution

Active Publication Date: 2019-06-18
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the error introduced by the sensor calibration will be brought into the calculation result through the correction of the strain data; Problems that cannot be solved by strain measurement methods in the environment

Method used

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  • A strain measurement method based on optical fiber sensor in high temperature environment
  • A strain measurement method based on optical fiber sensor in high temperature environment
  • A strain measurement method based on optical fiber sensor in high temperature environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1. Test the strain measurement in the working environment

[0044] 1) Design the position of the test point of the tested piece: the material of the tested piece is K417G, and design and install the test point at the center of the test piece;

[0045] 2) Install the sensor to the tested piece: Install the fiber grating strain sensor and the fiber grating temperature sensor to the test point using the standard installation process;

[0046] 3) Record the sensor output signal value before the test: connect the fiber grating type strain sensor and the fiber grating type temperature sensor to the demodulation equipment, set the demodulation parameters through the device operating software, ensure that the data acquisition and demodulation are normal, and record the sensor output signal values ​​respectively for X ε0 、X T0 ;

[0047] 4) Record the output signal value of the sensor in the actual measurement environment: install the test piece in the hot wind tunnel te...

Embodiment 2

[0061] Step 1. Test the strain measurement in the working environment

[0062] 1) Design the position of the test point of the tested piece: the material of the tested piece is K417G, and design and install the test point at the center of the test piece;

[0063] 2) Install the sensor to the tested piece: Install the fiber grating strain sensor and the fiber grating temperature sensor to the test point using the standard installation process;

[0064] 3) Record the sensor output signal value before the test: connect the fiber grating type strain sensor and the fiber grating type temperature sensor to the demodulation equipment, set the demodulation parameters through the device operating software, ensure that the data acquisition and demodulation are normal, and record the sensor output signal values ​​respectively for X ε0 、X T0 ;

[0065] 4) Record the output signal value of the sensor in the actual measurement environment: install the test piece in the hot wind tunnel te...

Embodiment 3

[0079] Change the fiber grating type strain sensor and fiber grating type temperature sensor in embodiment 1 to F-P interference type strain sensor and F-P interference type temperature sensor, and other steps are the same as embodiment 1.

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Abstract

The invention relates to an optical fiber sensor-based strain measurement method in a high-temperature environment and belongs to the technical field of test. The method comprises the following steps of 1, conducting the strain measurement in a working environment; 2, recurring strain measurement data in an analog environment; 3, acquiring a strain value. According to the technical scheme of the invention, the in-situ calibration of the strain measurement is indirectly realized, so that the traceability of strain measurement data in the high-temperature environment is realized. Meanwhile, the sensor-based calibration of parameters (such as sensitive coefficient, heat output and the like) in the high-temperature environment is not required, and the parameters can be directly applied to experiments and tests. Therefore, the introduction of errors during the calibration process is avoided. Meanwhile, the test environment, the state of a tested piece and the sensor installation can be recurred. An implicit error source during the measuring process is cancelled. The accuracy of the strain measurement in the high-temperature environment is obviously improved.

Description

technical field [0001] The invention relates to a strain measurement method in a high-temperature environment based on an optical fiber sensor, and belongs to the technical field of testing. technical background [0002] In engineering, it is often necessary to determine mechanical parameters such as stress, strain, and load by testing the stress and working state of parts and structures to solve the problem of strength and stiffness of engineering structures and machinery. For example, the hot-end components in an aero-engine are subjected to extremely severe and complex thermal loads during the working process. High temperature will significantly reduce the strength limit of the material and the load-carrying capacity of the structure. The reliability of the structure has become the key to the success or failure of the aero-engine development. In a high temperature environment, the material properties of the test piece and the strain gauge change, which will lead to a cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/165
Inventor 隋广慧陈爽江琴吴天武洪波张慧君
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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