scholarly journals Wideband fiber-optic Fabry-Perot acoustic sensing scheme using high-speed absolute cavity length demodulation

2021 ◽  
Vol 29 (5) ◽  
pp. 6768
Author(s):  
Yang Yang ◽  
Ya Wang ◽  
Ke Chen
Keyword(s):  
High Speed ◽  
Cavity Length ◽  
Fiber Optic ◽  
Acoustic Sensing ◽  
Fabry Perot

Fiber-Optic Extrinsic Fabry-Perot Interferometer Sensors with Multi-Wavelength Intensity Demodulation

2013 ◽  
Vol 470 ◽  
pp. 630-635 ◽  
Author(s):  
Ning Fang Song ◽  
Rui Qi Cui ◽  
Yu Jie Yang ◽  
Xiao Liang Xu
Keyword(s):  
Incident Wave ◽  
High Speed ◽  
Cavity Length ◽  
Fiber Optic ◽  
Wave Length ◽  
Fabry Perot ◽  
Multiple Wavelengths ◽  
Large Scope ◽  
Multi Wavelength ◽  
Novel Method

In this paper, a novel method used for Fabry-Perot cavity length's demodulation in high-speed and large scope measurement was proposed. Principle of the method is based on uniqueness of intensity of multiple wavelengths in the scope of Fabry-Perot vibration. This technique offers flexibility of selecting incident wave length and enhances the scope of demodulation of cavity length, compared with that popular triple wave length demodulation. In experiment, multi-wavelength demodulation is demonstrated for measurement of cavity length varying from 110um to 115um and the strain resolution was higher than 0.1um.

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).

scholarly journals A Zero-Cross Detection Algorithm for Cavity-Length Interrogation of Fiber-Optic Fabry–Perot Sensors

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3868
Author(s):  
Ma ◽  
Song ◽  
Huang ◽  
Guo ◽  
Yuan ◽  
...  
Keyword(s):  
Power Density ◽  
Cavity Length ◽  
Fiber Optic ◽  
Spectral Power ◽  
Spectral Power Density ◽  
Maximum Error ◽  
Detection Algorithm ◽  
Slow Variation ◽  
Fabry Perot ◽  
And Performance

A zero-cross detection algorithm was proposed for the cavity-length interrogation of fiber-optic Fabry–Perot (FP) sensors. The method can avoid the inaccuracy of peak determination in the conventional peak-to-peak method for the cavity-length interrogation of fiber-optic FP sensors caused by the slow variation of the spectral power density in peak neighboring regions. Both simulations and experiments were carried out to investigate the feasibility and performance of the zero-cross detection algorithm. Fiber-optic FP sensors with cavity lengths in the range of 150–1000 μm were successfully interrogated with a maximum error of 0.083 μm.

Precise cavity length control in fiber optic extrinsic Fabry-Perot interferometers

2005 ◽  
Author(s):  
Juncheng Xu ◽  
G.R. Pickrell ◽  
K.L. Cooper ◽  
Po Zhang ◽  
Anbo Wang
Keyword(s):  
Cavity Length ◽  
Fiber Optic ◽  
Fabry Perot

Fiber optic Fabry-Perot sensors for high-speed heat transfer measurements

1991 ◽  
Author(s):  
Stephen R. Kidd ◽  
Pranay G. Sinha ◽  
James S. Barton ◽  
Julian D. C. Jones
Keyword(s):  
Heat Transfer ◽  
High Speed ◽  
Fiber Optic ◽  
Fabry Perot

Elliptical-Fitting Cavity Length Demodulation Algorithm for Compound Fiber-Optic Fabry-Perot Pressure Sensor with Short Cavity

2019 ◽  
Vol 39 (6) ◽  
pp. 0606001
Author(s):  
王伟 Wei Wang ◽  
唐瑛 Ying Tang ◽  
张雄星 Xiongxing Zhang ◽  
陈海滨 Haibin Chen ◽  
郭子龙 Zilong Guo ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Cavity Length ◽  
Fiber Optic ◽  
Fabry Perot

High Speed Directly Modulated Fabry-Perot Lasers with an Ultra-Short Cavity Length

2020 ◽  
pp. 1-1 ◽  
Author(s):  
Yi-Lin Tsai ◽  
Shou-Wei Wang ◽  
Huang-Hsiung Huang ◽  
Hsiang-Yun Shih ◽  
Po-Yen Lu ◽  
...  
Keyword(s):  
High Speed ◽  
Cavity Length ◽  
Fabry Perot

A Gold Diaphragm Based Fabry-Perot Interferometer with a Fiber-Optic Collimator for Acoustic Sensing

2021 ◽  
pp. 1-1
Author(s):  
Zhuowei Xiang ◽  
Weiyu Dai ◽  
Weiying Rao ◽  
Xun Cai ◽  
Hongyan Fu
Keyword(s):  
Fiber Optic ◽  
Acoustic Sensing ◽  
Fabry Perot

scholarly journals Ultrathin graphene diaphragm-based extrinsic Fabry-Perot interferometer for ultra-wideband fiber optic acoustic sensing

2018 ◽  
Vol 26 (16) ◽  
pp. 20758 ◽  
Author(s):  
Wenjun Ni ◽  
Ping Lu ◽  
Xin Fu ◽  
Wei Zhang ◽  
Perry Ping Shum ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Ultra Wideband ◽  
Acoustic Sensing ◽  
Fabry Perot
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