Measurement of strain coefficient of unequal cross-section FBG sensor based on double optical levers

XU Jian; YANG De-xing; JIANG Ya-jun; DU Bo-bo

doi:10.3788/OPE.20162402.0245

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Measurement of strain coefficient of unequal cross-section FBG sensor based on double optical levers

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- Measurement of strain coefficient of unequal cross-section FBG sensor based on double optical levers
- Optics and Precision Engineering Vol. 24, Issue 2, Pages: 245-250(2016)
- 作者机构：
  
  西北工业大学理学院陕西省光信息技术重点实验室,陕西西安,710129
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162402.0245
  CLC： TB931;TN253
- Received：04 November 2015，
  
  Revised：09 December 2015，
  
  Published：25 February 2016
- 稿件说明：
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徐健, 杨德兴, 姜亚军等. 利用双光杠杆测量非等截面光纤布拉格光栅传感器的应变系数[J]. 光学精密工程, 2016,24(2): 245-250

XU Jian, YANG De-xing, JIANG Ya-jun etc. Measurement of strain coefficient of unequal cross-section FBG sensor based on double optical levers[J]. Editorial Office of Optics and Precision Engineering, 2016,24(2): 245-250
徐健, 杨德兴, 姜亚军等. 利用双光杠杆测量非等截面光纤布拉格光栅传感器的应变系数[J]. 光学精密工程, 2016,24(2): 245-250 DOI： 10.3788/OPE.20162402.0245.

XU Jian, YANG De-xing, JIANG Ya-jun etc. Measurement of strain coefficient of unequal cross-section FBG sensor based on double optical levers[J]. Editorial Office of Optics and Precision Engineering, 2016,24(2): 245-250 DOI： 10.3788/OPE.20162402.0245.

摘要

使用单个光杠杆监测传感器应变时

传感器两端的被夹持部位受力后易与电子万能试验机的夹持器产生滑移。为了消除滑移影响以提高测试精度

本文使用两套光杠杆建立了测量弹性受力部位呈非等截面的光纤布拉格光栅(FBG)传感器等效应变系数

eff

的实验测量系统。测试时

将两套光杠杆的平面反射镜分别安放在传感器弹性受力部位两侧的固定端端面上

测量出两个固定端在受力变形后的相对位移和相应的FBG中心波长变化量。然后

使用曲线拟合法和累加均值法对实验测得的数据进行处理来获得

eff

。建立了仿真模型

得到了

eff

预估值并与实测值进行了对比。结果显示:实验测得的

eff

为0.6817/pm

精度为0.91%

与仿真获得的预估值0.6720/pm相差仅为1.42%。该方法满足了准确测量非等截面结构FBG传感器应变系数的要求。

Abstract

When a single optical lever is used to test the strain coefficients of Fiber Bragg Gratings(FBGs)

slip effects may take place in the clamping part between the testing machine and the sensor. To effectively eliminate the slip effects and improve the test accuracy

a measurement system based on double optical levers was established to measure the strain coefficient of a FBG sensor with an elastic stress element by unequal cross sections. In the measurement

two optical lever mirrors were put respectively on the end faces of two fixed ends beside the sensor's elastic stress element. By measuring the relative displacement of two fixed ends

the equivalent strain coefficient of the sensor was obtained by data processing with the curve fitting method and cumulative average method. A simulation model was established

and the experiment and simulation were performed and compared. The results indicate that the equivalent strain coefficient of the sensor

eff

is 0.6817/pm obtained by the experiment and the precision is 0.91%. Compared to the coefficient 0.6720/pm from the software simulation

the difference is 1.42%. It is shown that the measurement method satisfies with the requirements for accurately measuring the strain coefficients of complex-structure sensors.

关键词

Keywords

references

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