Absolute strain measurements with multiplexed low-coherence demodulated fiber Fabry-Perot sensors

1994 ◽  
Author(s):  
Philipp M. Nellen ◽  
H. Pierhofer ◽  
Rolf Broennimann ◽  
Urs J. Sennhauser
Keyword(s):  
Strain Measurements ◽  
Low Coherence ◽  
Fabry Perot

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

Interferometric calibration of a strainmeter transducer

1971 ◽  
Vol 61 (4) ◽  
pp. 937-955
Author(s):  
Stanley Smookler ◽  
John V. Kline
Keyword(s):  
Thermal Expansion ◽  
Theoretical Analysis ◽  
Interference Pattern ◽  
Central Zone ◽  
Steel Tube ◽  
Peak Width ◽  
Strain Measurements ◽  
Fabry Perot

abstract A capacitive-strainmeter transducer is calibrated using a variable-spacing, Fabry-Perot interferometer. Optical flats are mounted on a spring parallelogram. Thermal expansion of a steel tube deforms the parallelogram, smoothly displacing one of the optical flats. This modulates the intensity of the 5016 àline, observed at the central zone of the interference pattern, and thus produces sharp peaks on a pen recorder. A theoretical analysis of the peak width, based on the work of Chabbal (1958), agrees with that recorded by the interferometer. This calibration permits earth-strain measurements to an accuracy of 1 per cent.

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 Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

2010 ◽  
Vol 18 (25) ◽  
pp. 26484 ◽  
Author(s):  
Dragan Coric ◽  
Marco Lai ◽  
John Botsis ◽  
Aiping Luo ◽  
Hans G. Limberger
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Small Diameter ◽  
Bragg Gratings ◽  
Strain Measurements ◽  
Low Coherence ◽  
Distributed Strain
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