TY - JOUR
T1 - Simple method to measure temperature and axial strain simultaneously using one in-Fiber Bragg-grating sensor
AU - Lo, Yu Lung
AU - Sirkis, J. S.
N1 - Funding Information:
The author would like to express his sincere thanks to Opto-Electrics and Systems Laboratories in Industrial Ethnology Research Institute (I.T.R.I) in Taiwan, R.O.C. for supporting of Bragg grating fibers. This work has been supported by National Science Council Grant No. NSC 86-2621-E-006-037 to the National Cheng Kung University
Funding Information:
supported by National Science Council Grant No. NSC 86-2621-E-006-037 to the National Cheng Kung University.
Publisher Copyright:
© 1997 SPIE. All rights reserved.
PY - 1997/6/6
Y1 - 1997/6/6
N2 - A simple method to simultaneously measure temperature and axial strain for a surface mounted Bragg grating sensor is presented. This method uses a single, uniform pitch Bragg grating that is only partially glued on the structure. Thermomechanical strain fields will produce two different Bragg wavelengths from the one fiber Bragg grating sensor. The Bragg wavelength reflected from the sensor section not glued to the structure is used to measure temperature variations; and the Bragg wavelength reflected from the sensor section glued to the specimen is affected by both of strain and temperature variations. However, under conditions of no cross-talk sensitivity between temperature and strain, the spectral separation between two Bragg wavelengths is directly interpreted as a wavelength shift caused by the thermomechanical strain in structures. After the temperature variation is obtained, the mechanical strain can be calculated if the thermalexpansion coefficient of structures is known. Therefore, this method supplies a simple measurement in temperature and axial strain simultaneously.
AB - A simple method to simultaneously measure temperature and axial strain for a surface mounted Bragg grating sensor is presented. This method uses a single, uniform pitch Bragg grating that is only partially glued on the structure. Thermomechanical strain fields will produce two different Bragg wavelengths from the one fiber Bragg grating sensor. The Bragg wavelength reflected from the sensor section not glued to the structure is used to measure temperature variations; and the Bragg wavelength reflected from the sensor section glued to the specimen is affected by both of strain and temperature variations. However, under conditions of no cross-talk sensitivity between temperature and strain, the spectral separation between two Bragg wavelengths is directly interpreted as a wavelength shift caused by the thermomechanical strain in structures. After the temperature variation is obtained, the mechanical strain can be calculated if the thermalexpansion coefficient of structures is known. Therefore, this method supplies a simple measurement in temperature and axial strain simultaneously.
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U2 - 10.1117/12.275742
DO - 10.1117/12.275742
M3 - Conference article
AN - SCOPUS:85034464290
SN - 0277-786X
VL - 3042
SP - 237
EP - 246
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation
Y2 - 3 March 1997 through 6 March 1997
ER -