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Sensors 2018, 18(4), 1207; https://doi.org/10.3390/s18041207

Continuous-Wave Fiber Cavity Ringdown Pressure Sensing Based on Frequency-Shifted Interferometry

1,2
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1,2,* , 1,2
,
1,2
,
1,2
and
3
1
Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China
2
School of Science, Hubei University of Technology, Wuhan 430068, China
3
Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 3G4, Canada
*
Author to whom correspondence should be addressed.
Received: 3 March 2018 / Revised: 31 March 2018 / Accepted: 12 April 2018 / Published: 16 April 2018
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4486 KB, uploaded 3 May 2018]   |  

Abstract

We present a continuous-wave fiber cavity ringdown (FCRD) pressure-sensing method based on frequency-shifted interferometry (FSI). Compared with traditional CRD or FCRD techniques, this FSI-FCRD scheme deduces pressure by measuring the decay rate of continuous light exiting the fiber ringdown cavity (RDC) in the spatial domain (i.e., the CRD distance), without the requirement for optical pulsation and fast electronics. By using a section of fiber with the buffer layer stripped in the fiber RDC as the sensor head, pressures were measured within the range from 0 to 10.4 MPa. The sensitivity of 0.02356/(km∙MPa) was obtained with a measurement error of 0.1%, and the corresponding pressure resolution was 0.05 MPa. It was found that the measurement sensitivity can be improved by enlarging the interaction length of the sensor head. The results show the proposed sensor has the advantages of simple structure, low cost, high sensitivity, and high stability in pressure detection. View Full-Text
Keywords: fiber cavity ringdown; frequency-shifted interferometry; pressure sensing; sensitivity fiber cavity ringdown; frequency-shifted interferometry; pressure sensing; sensitivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ou, Y.; Cheng, C.; Chen, Z.; Yang, Z.; Lv, H.; Qian, L. Continuous-Wave Fiber Cavity Ringdown Pressure Sensing Based on Frequency-Shifted Interferometry. Sensors 2018, 18, 1207.

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