Distributed, intra grating sensing by Fabry-Pérot wavelength tuned low-coherence interferometry

1997 ◽  
Author(s):  
Michel LeBlanc ◽  
Alan D. Kersey
Keyword(s):  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Fabry Perot

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.

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. 

scholarly journals Low-coherence photonic method of electrochemical processes monitoring

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Monika Kosowska ◽  
Paweł Jakóbczyk ◽  
Michał Rycewicz ◽  
Alex Vitkin ◽  
Małgorzata Szczerska
Keyword(s):  
Electrochemical Process ◽  
Electrochemical Measurements ◽  
Boron Doped Diamond ◽  
Silica Substrate ◽  
Low Coherence ◽  
Optical Responses ◽  
Boron Doped ◽  
Fabry Perot ◽  
Hybrid Characterization

AbstractWe present an advanced multimodality characterization platform for simultaneous optical and electrochemical measurements of ferrocyanides. Specifically, we combined a fiber-optic Fabry–Perot interferometer with a three-electrode electrochemical setup to demonstrate a proof-of-principle of this hybrid characterization approach, and obtained feasibility data in its monitoring of electrochemical reactions in a boron-doped diamond film deposited on a silica substrate. The film plays the dual role of being the working electrode in the electrochemical reaction, as well as affording the reflectivity to enable the optical interferometry measurements. Optical responses during the redox reactions of the electrochemical process are presented. This work proves that simultaneous opto-electrochemical measurements of liquids are possible.

scholarly journals Response of a New Low-Coherence Fabry-Perot Sensor to Hematocrit Levels in Human Blood

Sensors ◽  
2014 ◽  
Vol 14 (4) ◽  
pp. 6965-6976 ◽  
Author(s):  
Małgorzata Jędrzejewska-Szczerska
Keyword(s):  
Human Blood ◽  
Low Coherence ◽  
Fabry Perot

Fringe-Distortion-Correction for Polarized Low-Coherence Interferometry With Phosphor-Based LED

2019 ◽  
Vol 37 (14) ◽  
pp. 3557-3562
Author(s):  
Rundong Wang ◽  
Shuang Wang ◽  
Junfeng Jiang ◽  
Kun Liu ◽  
Xue Wang ◽  
...  
Keyword(s):  
Distortion Correction ◽  
Low Coherence ◽  
Low Coherence Interferometry

Light source for low-coherence interferometry surface diagnostics

2011 ◽  
Author(s):  
Zdeněk Buchta ◽  
Bretislav Mikel ◽  
Simon Rerucha ◽  
Josef Lazar ◽  
Ondrej Cip
Keyword(s):  
Light Source ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Surface Diagnostics

scholarly journals Cellular Organization and Substructure Measured Using Angle-Resolved Low-Coherence Interferometry

2002 ◽  
Vol 82 (4) ◽  
pp. 2256-2264 ◽  
Author(s):  
Adam Wax ◽  
Changhuei Yang ◽  
Vadim Backman ◽  
Kamran Badizadegan ◽  
Charles W. Boone ◽  
...  
Keyword(s):  
Cellular Organization ◽  
Low Coherence ◽  
Low Coherence Interferometry
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