Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1682-1688.doi: 10.13229/j.cnki.jdxbgxb20180842

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Temperature decoupling large range fiber Bragg grating strain sensor

Guang YAN1,2(),Jian-zhong LU1,2,Kai-yu ZHANG1,2,Fan-yong MENG1,2,Lian-qing ZHU1,2()   

  1. 1. Instrument Science and Optoelectronic Engineering, Beijing Information Science and Technology University, Beijing 100192, China
    2. Beijing Laboratory of Optical Fiber Sensing and System, Beijing Information Science and Technology University, Beijing 100016, China
  • Received:2018-08-13 Online:2019-09-01 Published:2019-09-11
  • Contact: Lian-qing ZHU E-mail:584851848@qq.com;zhulianqing@sina.com

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Abstract:

In the test of aircraft load parameters, some structures will produce large strain concentration points. In order to solve the problem of large-scale strain monitoring of aircraft structure，a temperature-sensitized, strain-reducing fiber grating large-range strain sensor is proposed. The fiber Bragg grating sensing theory is analyzed, and a new sensor base structure is designed and analyzed by finite element method. The temperature-calibration, temperature repeatability, and strain calibration tests were performed on the packaged sensor. The results show that in the environment of 10~60 °C, the packaged fiber grating strain sensor has a temperature sensitivity of 44.959 pm/°C, which is 4.5 times stronger than bare fiber and has a linearity of 0.999. The central wavelength change at the same temperature is ±4 pm. Under the condition of 0~2000 με, the strain sensitivity is 0.79 pm/με, which is 1.52 times lower than that of bare fiber, the linearity is 0.999, and the repeatability of multiple strain cycles is ±5 pm. The packaged sensor has good sensitivity and consistency, meets the accurate measurement of the aircraft's large-scale strain, and has a promising future in the monitoring of aircraft strain concentration structure.

Key words: technology of instrument and meter, aircraft load spectrum, temperature decoupling, fiber grating, strain sensor

CLC Number: 

  • TP212.9

Fig.1

Structural design of temperature decoupling large range strain sensor"

Table 1

Main parameters of epoxy glue DP420"

名 称 参 数
“A”组分与“B”组分 2∶1
粘接度/24 ℃ 45000CPS
重叠剪切强度/24 ℃ 4500SPI

Fig.2

Finite element analysis"

Fig.3

Calibration experiment of sensor temperature module"

Fig.4

Temperature repeatability calibration of sensor"

Fig.5

Temperature and center wavelength deviation curve"

Fig.6

Temperature repeatability deviation curve of sensor"

Fig.7

Stretch parts and three sensor layouts"

Fig.8

Strain calibration system diagram"

Fig.9

Tension and center wavelength offset curve"

Fig.10

Sensor strain repeatability deviation curve"

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