Estimations of fiber Bragg grating parameters and strain gauge factor using optical spectrum and strain distribution information

2007 ◽  
Vol 46 (21) ◽  
pp. 4555 ◽  
Author(s):  
C. C. Cheng ◽  
Y. L. Lo ◽  
W. Y. Li ◽  
C. T. Kuo ◽  
H. C. Cheng
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Strain Distribution ◽  
Optical Spectrum ◽  
Gauge Factor ◽  
Bragg Grating ◽  
Strain Gauge Factor

Research on Temperature Compensation of the Fiber Bragg Grating Sensor and the Resistance Strain Gauge

2021 ◽  
Vol 16 (6) ◽  
pp. 1020-1027
Author(s):  
Feng Zhu ◽  
Min Liu ◽  
Chengjun Xu ◽  
Sheng Zou ◽  
Chentong Chen ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Temperature Compensation ◽  
Metal Structure ◽  
Resistance Strain ◽  
Fiber Bragg Grating Sensor ◽  
Bragg Grating ◽  
Resistance Strain Gauge ◽  
Strain Monitoring ◽  
Bragg Grating Sensor

The fiber Bragg grating sensor is widely used in strain monitoring of large metal structure and trend to replace the resistance strain gauge due to its advantages of strong stability, high measurement accuracy, multiple points measuring, strong environmental suitability and long transmission distance. The temperature-induced strain, which can have the same order of magnitudes as the mechanically-induced strain, will cause great errors in the strain monitoring. Therefore, the temperature compensation for the sensors is essential to guarantee the measurement accuracy. The existing theoretical models and experiment platforms for analyzing the temperature compensation are established by assuming that the testing temperature is constant. However, the surrounding temperature of some large metal structure is not stable, and the effect of temperature change cannot be neglected. This paper aims to establish an analytic model and an experiment platform to compare the temperature compensation of the fiber bragg grating sensor and the resistance strain gauge. The superiority of the temperature compensation for the fiber bragg grating sensor is verified. The result provides theoretical support for choosing the fiber bragg grating sensor in the long-time strain monitoring.

Optical-spectrum Characteristics of a Biconical Fiber Bragg Grating

2016 ◽  
Vol 45 (11) ◽  
pp. 1106005
Author(s):  
赵洪霞 ZHAO Hong-xia ◽  
程培红 CHENG Pei-hong ◽  
丁志群 DING Zhi-qun ◽  
鲍吉龙 BAO Ji-long ◽  
蒋鹏 JIANG Peng ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Optical Spectrum ◽  
Bragg Grating ◽  
Spectrum Characteristics

Application of optical fiber Bragg grating strain gauge to cable force monitoring of FAST

2015 ◽  
Vol 23 (4) ◽  
pp. 919-925 ◽  
Author(s):  
孙晓 SUN Xiao ◽  
王启明 WANG Qi-ming ◽  
朱明 ZHU Ming ◽  
吴明长 WU Ming-chang
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Bragg Grating ◽  
Cable Force ◽  
Force Monitoring ◽  
Optical Fiber Bragg Grating

Fiber Bragg Grating Demodulation System Based on Equi-Intensity Cantilever Beam

2010 ◽  
Vol 437 ◽  
pp. 359-363
Author(s):  
Hong Li ◽  
Wei Ping Yan ◽  
Ren Sheng Shen ◽  
Ben Yu Wang
Keyword(s):  
Fiber Bragg Grating ◽  
Cantilever Beam ◽  
Optical Spectrum ◽  
Optical Signal ◽  
Electrical Signal ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Optical Spectrum Analyzer ◽  
Bragg Wavelength ◽  
Scanning Velocity

Optical spectrum analyzer (OSA) can achieve the higher precision and sensitivity, but it is disadvantageous for translating optical signal into electrical signal. A fiber Bragg grating (FBG) matched filtering system based on equi-intensity cantilever beam was presented in this paper. Strain characteristics in different location of cantilever beam were described, and the strain sensitivity of matching grating demodulation based on equi-intensity cantilever beam was deduced mathematically. Strain characteristics of cantilever beam were verified, and the sensing effect of the system was tested. The Bragg wavelength shift range of the demodulating FBG placed on the cantilever beam reached 10 nm, and scanning velocity was 0.125 nm/s. The system could demodulate slow-altered sensing signal accurately and rapidly.

Applications of Fiber Bragg Grating in Strain Measurement of Concrete Bridge

2011 ◽  
Vol 368-373 ◽  
pp. 2286-2290
Author(s):  
Xian Xi Tang ◽  
Xian Zhou Tang ◽  
Yue Xu ◽  
Wei Guo
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Strain Measurement ◽  
Fatigue Loading ◽  
Good Effect ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Concrete Bridge ◽  
Experimental Researches

In order to verify the role of fiber bragg grating strain gauge in strain measurement of concrete bridge, and the influence of concrete and steel strain properties by fatigue loading, the relevant experimental researches were carried out. The results indicated that the Fiber Bragg grating strain gauge could reflect the strain regularity of concrete and steel well; for the fiber grating strain rosettes inside the concrete, the pasting equipments of fiber gratings had a certain impact of the measurement effect. The fatigue loading had a certain impact of the properties of concrete and steel, in conditions of the same number of fatigue, the greater the stress amplitude the more obvious the effects. The results analysis shown that, fiber grating strain measurement innovated the means and methods of strain measurement in detailed structure of the concrete bridge, for the strain measurements of concrete bridge under fatigue loading, the FBG could still play very good effect.

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