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Open AccessArticle

Investigation of a Signal Demodulation Method based on Wavelet Transformation for OFDR to Enhance Its Distributed Sensing Performance

by Kunpeng Feng 1,2,*,†, Jiwen Cui 3,4,*,†, Hong Dang 3,4,†, Xun Sun 3,4, Dong Jiang 3,4, Yihua Jin 3,4, Yizhao Niu 3,4 and Xuping Zhang 1,2
1
Institute of Optical Communication Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing 210093, China
3
Center of Ultra-precision Optoelectronic Instrument, Harbin Institute of Technology, Harbin 150080, China
4
Key Lab of Ultra-precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2019, 19(13), 2850; https://doi.org/10.3390/s19132850
Received: 20 May 2019 / Revised: 25 June 2019 / Accepted: 26 June 2019 / Published: 27 June 2019
(This article belongs to the Special Issue Optical Fibers for Distributed Sensors)
Optical fiber distributed sensing that is based on optical frequency domain reflectometer (OFDR) is a promising technology for achieving a highest spatial resolution downwards to several millimeters. An OFDR signal demodulation method that is based on Morlet wavelet transformation (WT) is demonstrated in detail to improve the resolution of distributed sensing physical quantity under a high spatial resolution, aiming at the trade-off between spatial and spectrum resolution. The spectrum resolution, spatial interval of the measured gauges, and spatial resolution can be manually controlled by adjusting the wavelet parameters. The experimental results that were achieved by the wavelet transformation (WT) method are compared with these by short time Fourier transformation (STFT) method and they indicate that significant improvements, such as strain resolution of 1 με, spatial resolution of 5 mm, average repeatability of 4.3 με, and stability of 7.3 με within one hour, have been achieved. The advantages of this method are high spatial and spectral resolution, robust, and applicability with current OFDR systems. View Full-Text
Keywords: Optical distributed sensing; wavelet transforms; OFDR Optical distributed sensing; wavelet transforms; OFDR
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Feng, K.; Cui, J.; Dang, H.; Sun, X.; Jiang, D.; Jin, Y.; Niu, Y.; Zhang, X. Investigation of a Signal Demodulation Method based on Wavelet Transformation for OFDR to Enhance Its Distributed Sensing Performance. Sensors 2019, 19, 2850.

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