Dynamic and static strain gauge using superimposed fiber Bragg gratings

被引：6
|
作者：
Ma, Y. C. [1 ,2 ]
Yang, Y. H. [1 ]
Li, J. M. [2 ]
Yang, M. W. [1 ]
Tang, J. [2 ]
Liang, T. [2 ]
机构：
[1] Beihang Univ, Dept Optoelecton, Sch Instrument Sci & Optoelect Engn, Beijing 100191, Peoples R China
[2] N Univ China, Key Lab Instrumentat Sci & Dynam Measurement, Minist Educ, Taiyuan 030051, Peoples R China
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 2012年 / 23卷 / 10期
关键词：
fiber Bragg grating; interrogation; centroid; total harmonic distortion; TEMPERATURE; GENERATION; FBG;
D O I：
10.1088/0957-0233/23/10/105202
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper demonstrates a simple and fast interrogation method for the dynamic and/or static strain gauge using a reflection spectrum from two superimposed fiber Bragg gratings (FBGs). The superimposed FBGs are designed to decrease nonequidistant space of generated a sensing pulse train in a time domain during dynamic strain gauge. By combining centroid finding with smooth filtering methods, both the interrogation speed and accuracy are improved. A four times increase in the interrogation speed of dynamic strain, by generating a 2 kHz optical sensing pulse train from a 500 Hz scanning frequency, is demonstrated experimentally. The interrogation uncertainty and total harmonic distortion characterization of superimposed FBGs are tested and less than 4 pm standard deviation is obtained.
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页数：5
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