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

Optical detection of photoacoustic waves using phase sensitive low-coherence interferometry

2012 ◽  
Author(s):  
B. Hermann ◽  
M. Gabriele-Sandrian ◽  
B. Hofer ◽  
B. Povazay ◽  
W. Drexler
Keyword(s):  
Optical Detection ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Phase Sensitive

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.

Low-coherence interferometry for phase-sensitive measurement of optical rotation

2018 ◽  
Vol 57 (20) ◽  
pp. 5893 ◽  
Author(s):  
Chao J. Liu ◽  
Tianqi Li ◽  
Taner Akkin
Keyword(s):  
Optical Rotation ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Phase Sensitive

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. 

Measurement of Faraday rotation using phase-sensitive low-coherence interferometry

2009 ◽  
Vol 48 (30) ◽  
pp. 5829 ◽  
Author(s):  
Muhammad K. Al-Qaisi ◽  
Hui Wang ◽  
Taner Akkin
Keyword(s):  
Faraday Rotation ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Phase Sensitive
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