Fiber optic total reflected extrinsic Fabry-Perot interferometric sensor for measuring structural strain

2000 ◽  
Author(s):  
Il-Bum Kwon ◽  
Man-Yong Choi ◽  
Hahngue Moon
Keyword(s):  
Fiber Optic ◽  
Fabry Perot ◽  
Interferometric Sensor ◽  
Structural Strain

scholarly journals A High-Speed Demodulation Technology of Fiber Optic Extrinsic Fabry-Perot Interferometric Sensor Based on Coarse Spectrum

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6609
Author(s):  
Peng Zhang ◽  
Ying Wang ◽  
Yuru Chen ◽  
Xiaohua Lei ◽  
Yi Qi ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Cavity Length ◽  
Fiber Optic ◽  
Likelihood Estimation ◽  
Time Dynamic ◽  
Wavelength Division ◽  
Broadband Spectrum ◽  
Fabry Perot ◽  
Interferometric Sensor

A fast real-time demodulation method based on the coarsely sampled spectrum is proposed for transient signals of fiber optic extrinsic Fabry-Perot interferometers (EFPI) sensors. The feasibility of phase demodulation using a coarse spectrum is theoretically analyzed. Based on the coarse spectrum, fast Fourier transform (FFT) algorithm is used to roughly estimate the cavity length. According to the rough estimation, the maximum likelihood estimation (MLE) algorithm is applied to calculate the cavity length accurately. The dense wavelength division multiplexer (DWDM) is used to split the broadband spectrum into the coarse spectrum, and the high-speed synchronous ADC collects the spectrum. The experimental results show that the system can achieve a real-time dynamic demodulation speed of 50 kHz, a static measurement root mean square error (RMSE) of 0.184 nm, and a maximum absolute and relative error distribution of 15 nm and 0.005% of the measurement cavity length compared with optical spectrum analyzers (OSA).

Micro Extrinsic Fiber-Optic Fabry-Perot Interferometric Sensor Based on Erbium- and Boron-Doped Fibers

2010 ◽  
Vol 27 (2) ◽  
pp. 024208 ◽  
Author(s):  
Rao Yun-Jiang ◽  
Xu Bing ◽  
Ran Zeng-Ling ◽  
Gong Yuan
Keyword(s):  
Fiber Optic ◽  
Boron Doped ◽  
Fabry Perot ◽  
Doped Fibers ◽  
Interferometric Sensor

Low-Loss Fiber-Optic Intrinsic Fabry-Perot Micro-Cavity Interferometric Sensor

2008 ◽  
Author(s):  
Na Chen ◽  
Ping Xu ◽  
Fufei Pang ◽  
Tingyun Wang ◽  
Xianglong Zeng ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Low Loss ◽  
Fabry Perot ◽  
Interferometric Sensor ◽  
Micro Cavity
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