scholarly journals Demodulation Method of F-P Sensor Based on Wavelet Transform and Polarization Low Coherence Interferometry

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4249
Author(s):  
Jiwen Cui ◽  
Yizhao Niu ◽  
Hong Dang ◽  
Kunpeng Feng ◽  
Xun Sun ◽  
...  
Keyword(s):  
Cavity Length ◽  
Sampling Interval ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Data Processing Method ◽  
Fabry Perot ◽  
Complex Morlet Wavelet ◽  
Influence Of Noise ◽  
Demodulation Method ◽  
Better Than

Polarized low-coherence interferometry (PLCI) is widely used for the demodulation of Fabry–Perot (F-P) sensors. To avoid the influence of noise and dispersion on interference fringes, this paper proposes a data processing method in which the wavelet tools are applied to extract useful information from the extremum locations and envelope center of the fringes. Firstly, the wavelet threshold denoising (WTD) algorithm is used to remove electrical noise, and the complex Morlet wavelet is used to extract the fringe envelope. Based on this, the envelope center is used to predict the extremum locations of the specified order in its adjacent interval, the predicted locations are used as references to track the exact extremum locations, and the middle location of the peak and valley values is obtained to demodulate the F-P cavity accurately. The validity of this demodulation theory is verified by an air F-P cavity whose cavity length varies from 17 to 20 μm. With a sampling interval of 30 nm, the experimental results indicate that the repeatability accuracy is higher than 6.04 nm, and the resolution is better than 4.0 nm.

scholarly journals Two-Parameter Elliptical Fitting Method for Short-Cavity Fiber Fabry–Perot Sensor Interrogation

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 36 ◽  
Author(s):  
Xiongxing Zhang ◽  
Wei Wang ◽  
Haibin Chen ◽  
Ying Tang ◽  
Zhibo Ma ◽  
...  
Keyword(s):  
White Light ◽  
Cavity Length ◽  
Processing Method ◽  
Light Sources ◽  
Fitting Method ◽  
Data Processing Method ◽  
Fabry Perot ◽  
Gap Sensors ◽  
Two Parameter ◽  
Better Than

To solve the cavity interrogation problem of short cavity fiber Fabry–Perot sensors in white light spectral interrogation with amplified spontaneous emissions (ASEs) as the white light sources, a data processing method, using an improved elliptical fitting equation with only two undetermined coefficients, is proposed. Based on the method, the cavity length of a fiber Fabry–Perot sensor without a complete reflection spectrum period in the frequency domain can be interrogated with relatively high resolution. Extrinsic fiber Fabry–Perot air-gap sensors with cavity lengths less than 30 μm are used to experimentally verify the method, and are successfully interrogated with an accuracy better than 0.55%.

scholarly journals Position-deviation-compensation demodulation method for multi-channel polarized low-coherence interferometry

2018 ◽  
Vol 26 (13) ◽  
pp. 17407 ◽  
Author(s):  
Shuang Wang ◽  
Jinshi Zhang ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Xue Wang ◽  
...  
Keyword(s):  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Demodulation Method

A Simple and Effective Demodulation Method for Polarized Low-Coherence Interferometry

2012 ◽  
Vol 24 (16) ◽  
pp. 1390-1392 ◽  
Author(s):  
Shaohua Wang ◽  
Junfeng Jiang ◽  
Tiegen Liu ◽  
Kun Liu ◽  
Jinde Yin ◽  
...  
Keyword(s):  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Demodulation Method

scholarly journals Analysis of micromachined Fabry-Pérot cavities using phase-sensitive optical low coherence interferometry: Insight on dimensional measurements of dielectric layers

AIP Advances ◽  
2012 ◽  
Vol 2 (2) ◽  
pp. 022143 ◽  
Author(s):  
M. Malak ◽  
A.-F. Obaton ◽  
F. Marty ◽  
N. Pavy ◽  
S. Didelon ◽  
...  
Keyword(s):  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Dielectric Layers ◽  
Fabry Perot ◽  
Dimensional Measurements ◽  
Phase Sensitive

Zero-fringe demodulation method based on location-dependent birefringence dispersion in polarized low-coherence interferometry

2014 ◽  
Vol 39 (7) ◽  
pp. 1827 ◽  
Author(s):  
Shuang Wang ◽  
Tiegen Liu ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Jinde Yin ◽  
...  
Keyword(s):  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Demodulation Method

scholarly journals A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability

2020 ◽  
Vol 12 (2) ◽  
pp. 1-11
Author(s):  
Chao Wang ◽  
Xuezhi Zhang ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Shuang Wang ◽  
...  
Keyword(s):  
High Accuracy ◽  
Spatial Domain ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Demodulation Method

Wavelength-division-multiplexing method of polarized low-coherence interferometry for fiber Fabry–Perot interferometric sensors

2013 ◽  
Vol 38 (19) ◽  
pp. 3751 ◽  
Author(s):  
Jinde Yin ◽  
Tiegen Liu ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Wavelength Division ◽  
Low Coherence ◽  
Interferometric Sensors ◽  
Low Coherence Interferometry ◽  
Fabry Perot

Measurement of deformations of structural elements technical systems of aircraft by fiber optic devices

2018 ◽  
pp. 14-24
Author(s):  
V. G. Isaev ◽  
N. G. Seregin ◽  
N. N. Grechanaya
Keyword(s):  
Fiber Optic ◽  
Future Application ◽  
Structural Elements ◽  
Measuring Systems ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Fabry Perot ◽  
Fiber Optical ◽  
Technical Systems ◽  
Reliability Of Operation

The article deals with the measurement of deformations of structural elements of technical systems. The analysis of damages and deformations arising in the elements of aircraft structures during operation is carried out. The conducted researches of the fiber-optical sensor (VOD) based on the Fabry-Perot interferometer confirmed its accuracy and reliability of operation, since the interferometer base is significantly less than the length of the fastening element. The influence of the change in ambient temperature on the change in the base is negligible. Thus, the application of the method of fiber-optic low-coherence interferometry makes it possible to provide high accuracy and reliable measurement of the deformations of the structural elements of technical systems in the process of their research, design, manufacture and operation, which makes it possible to recommend the use of the Fabry-Perot interferometer as primary transducers (sensors) as part of measuring systems. The manufacturing technology has been developed and the sensitivity of the VOD temperature sensors made on the basis of the Fabry-Perot interferometer has been tested, which have shown their reliability and future application in automated measuring systems. 

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