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Online calibrating device and method for fiber Bragg grating (FBG) strain sensor

A strain sensor, fiber grating technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of large differences, different, ineffective online calibration, dynamic calibration in-situ calibration, etc., and achieve convenient calibration methods. Effect

Active Publication Date: 2012-11-14
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0002] Fiber Bragg grating, that is, fiber bragg grating, or FBG, is currently being used more and more in the field of structural testing. With the increase in the application of fiber grating sensors in the field of structural testing, such as aircraft structure testing, mechanical structure testing, In the testing of large civil structures, more and more engineering applications require the sensitivity of fiber gratings, but there is no effective online calibration, dynamic calibration, or in-situ calibration methods
Since the sensitivity of the fiber grating sensor varies with each pasting process, and sometimes the difference is relatively large, it is necessary to perform on-line calibration of the fiber grating sensor after pasting. Since fiber gratings are often used to test dynamic strain, other Dynamic calibration and dynamic sensitivity, while no online calibration method currently exists for FBG sensors

Method used

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  • Online calibrating device and method for fiber Bragg grating (FBG) strain sensor
  • Online calibrating device and method for fiber Bragg grating (FBG) strain sensor
  • Online calibrating device and method for fiber Bragg grating (FBG) strain sensor

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Embodiment

[0039] An online calibration device for fiber grating strain sensors, such as figure 1 and figure 2 As shown, it includes the simulated board to be tested, the boundary support member, the fiber grating strain sensor, the first transmission cable, the fiber grating demodulation instrument, the host computer, the laser lens, the second transmission cable, the laser scanner vibration test and analysis system, and the excitation device and excitation device connection line;

[0040] The above-mentioned excitation device adopts a force hammer;

[0041] The above fiber grating strain sensor is a linear structure with a diameter of 125um and a length of 15mm;

[0042] The above laser lens is Polytec's PSV-400 scanning head;

[0043] The above-mentioned laser scanner vibration test and analysis system is OFV-5000 vibrometer controller of Polytec Company;

[0044] The model of the fiber grating demodulation instrument mentioned above is SM130;

[0045] The length of the above si...

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Abstract

The invention relates to an online calibrating device and a method for a fiber Bragg grating (FBG) strain sensor, belonging to the technical field of metrological testing and calibrating. The device comprises a simulating plate to be tested, a boundary support component, a FBG strain sensor, a first transmission optical cable, a FBG demodulating instrument, an upper computer, a laser lens, a second transmission optical cable, a laser scanner vibration testing and analyzing system, an exciting device and an exciting device connecting line. The calibrating method provided by the invention is convenient and fast and has the characteristics of online calibrating, in-situ calibrating and dynamic calibrating; due to the characteristics, the calibrating method is suitable for engineering application and can provide a dynamic sensitivity coefficient for an attached bare FBG sensor and a packaged FBG stain sensor; and the online calibrating device and the method for the FBG strain sensor provided by the invention can be applied to detecting whether the attaching of the sensor satisfies the requirement or not and can also be used for calibrating the sensitivity coefficient of sensors after the sensors are used for a long time.

Description

technical field [0001] The invention relates to an online calibration device and method for an optical fiber grating strain sensor, belonging to the technical field of measurement testing and calibration. Background technique [0002] Fiber Bragg grating, that is, fiber bragg grating, or FBG, is currently being used more and more in the field of structural testing. With the increase in the application of fiber grating sensors in the field of structural testing, such as aircraft structure testing, mechanical structure testing, For the testing of large civil structures, more and more engineering applications require the sensitivity of fiber gratings, but there are no effective methods for online calibration, dynamic calibration, and in-situ calibration. Since the sensitivity of the fiber grating sensor varies with each pasting process, and sometimes the difference is relatively large, it is necessary to perform on-line calibration of the fiber grating sensor after pasting. Sin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 王利恒
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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