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Open AccessArticle

Enhancement of the Performance and Data Processing Rate of an Optical Frequency Domain Reflectometer Distributed Sensing System Using A Limited Swept Wavelength Range

by Kunpeng Feng 1,2,*,†, Jiwen Cui 1,*,†, Yihua Jin 1,†, Xun Sun 1, Dong Jiang 1,3, Hong Dang 1, Yizhao Niu 1 and Jiubin Tan 1
1
Institute of Ultra-precision Optoelectronic Instrument Engineering, Science Park, Harbin Institute of Technology, Harbin 150080, China
2
Department of Automation, Harbin Engineering University, Harbin 150001, China
3
Huawei Technologies Limited Company, Huawei Building, Beijing 100085, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2018, 18(10), 3480; https://doi.org/10.3390/s18103480
Received: 25 August 2018 / Revised: 7 October 2018 / Accepted: 11 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Distributed Optical Fiber Sensing)
A novel optical frequency domain reflectometer (OFDR) processing algorithm is proposed to enhance the measurable range and data processing rate using a narrow swept spectrum range and reducing the time consuming of the process distributed sensing results. To reduce the swept wavelength range and simultaneously enhance strain measurable range, the local similarity characteristics of Rayleigh scattering fingerprint spectrum is discovered and a new similarity evaluation function based on least-square method is built to improve the data processing rate and sensing performance. By this method, the strain measurable range is raised to 3000 µε under a highest spatial resolution of 3 mm when the swept spectrum range is only 10 nm and the data processing rate is improved by at least 10 times. Experimental results indicate that a nonlinearity of less than 0.5%, a strain resolution of better than 10 µε, a repeatability at zero strain of below ±0.4 GHz and a full-scale accuracy is lower than 0.85 GHz under a highest spatial resolution of 3 mm can be achieved. Advantages of this method are fast processing rate, large strain measurable range, high SNR, and applicability with current OFDR systems. View Full-Text
Keywords: distributed sensing; Rayleigh scattering; optical fiber; least-squares method distributed sensing; Rayleigh scattering; optical fiber; least-squares method
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Feng, K.; Cui, J.; Jin, Y.; Sun, X.; Jiang, D.; Dang, H.; Niu, Y.; Tan, J. Enhancement of the Performance and Data Processing Rate of an Optical Frequency Domain Reflectometer Distributed Sensing System Using A Limited Swept Wavelength Range. Sensors 2018, 18, 3480.

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