Three-way fiber bragg grating strain rosette sensor consistency installation and calibration method
A fiber grating and calibration method technology, applied in the direction of optical devices, instruments, measuring devices, etc., can solve problems such as inaccurate principal strain values of structures, hidden dangers of aerospace safety, and deviations in strain measurement results, and achieve accurate calculation and accuracy. Effects of safe state, addressing strain sensitivity, and improving accuracy
Active Publication Date: 2021-01-12
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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Problems solved by technology
[0007] (1) The strain sensitivity coefficient of the surface-mounted fiber Bragg grating strain sensor that adopts the adhesive installation method will be affected by the structure material to be measured, the sensor packaging substrate material, and the adhesive strength, which will cause the strain transfer efficiency to vary, resulting in strain measurement results Deviation;
[0008] (2) After the three-way fiber grating strain rosette sensor is calibrated, it needs to be installed on the surface of the object to be tested by gluing. Factors such as deviation, glue drying time control, pressure control after glue application, and adhesive overflow substrate control will cause the parameters of each FBG strain sensor on the aircraft to be different. The value will bring a large error, and the final principal strain value of the structure will be inaccurate, which has a large safety hazard in aerospace
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[0034] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways than those described here. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0035] The strain sensitivity coefficient of the fiber Bragg grating strain sensor is a key parameter affecting the measurement accuracy of the sensor. In order to accurately obtain the strain sensitivity coefficient of the sensor, it is decomposed into the clamping displacement sensitivity coefficient related to the sensor itself and the structure material to be measured, the sensor package substrate Material and adhesive strength ...
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Abstract
The invention discloses a three-way fiber bragg grating strain rosette sensor consistency installation and calibration method. The method comprises the steps: calibrating the clamping displacement sensitivity of all three-way fiber bragg grating strain rosette sensors; carrying out consistency installation on the calibrated three-way fiber bragg grating strain rosette sensors; sampling and calibrating a strain transfer coefficient of the three-way fiber bragg grating strain rosette sensor; obtaining a calibration formula, and achieving the consistency installation and calibration of the three-way fiber bragg grating strain rosette sensor. According to the scheme, the clamping displacement sensitivity coefficient of each fiber bragg grating strain sensor is calibrated based on the combination of clamping displacement and equal-strength beam calibration, the strain transfer coefficient is calibrated independently, the strain sensitivity of the sensor is obtained, and the measurement error caused by inconsistent sensor processing during sampling calibration is solved; and through the consistent installation process, the consistency of strain transfer coefficients of all installed sensors can be ensured, the strain measurement precision is effectively improved, and an important guarantee is provided for high-precision measurement of three-way strain of a structural body.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for solving high-consistency calibration and installation of large-scale three-way optical fiber grating rosette sensors. Background technique [0002] During the flight of the aircraft, it is necessary to monitor the maximum principal strain of the aircraft's own cabin or tank, so as to play a role in safety warning. For the acquisition of the maximum principal strain, the fiber grating strain sensor is often pasted on the surface of the object to be measured in the form of a three-dimensional strain rosette, and then the relevant measurement results are brought into the calculation formula to obtain the maximum principal strain. [0003] For example, the installation of the three-way fiber grating rosette sensor is completed at the point O to be measured, and the three-way strain measurement is completed, and the three-way angles are α 1 、α ...
Claims
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IPC IPC(8): G01B11/16
CPCG01B11/18
Inventor罗玉祥张建德伍攀峰王晓宇高翔杨宁刘强孙华亮王浩
OwnerSHANDONG INST OF AEROSPACE ELECTRONICS TECH