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Sensors 2013, 13(11), 15452-15464; doi:10.3390/s131115452

Performance of a Distributed Simultaneous Strain and Temperature Sensor Based on a Fabry-Perot Laser Diode and a Dual-Stage FBG Optical Demultiplexer

1
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea
2
School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea
3
Mine Reclamation Corporation, Chungjindonggil 30, Jongro-gu, Seoul 110-727, Korea
*
Authors to whom correspondence should be addressed.
Received: 17 September 2013 / Revised: 4 November 2013 / Accepted: 8 November 2013 / Published: 12 November 2013
(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)
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Abstract

A simultaneous strain and temperature measurement method using a Fabry-Perot laser diode (FP-LD) and a dual-stage fiber Bragg grating (FBG) optical demultiplexer was applied to a distributed sensor system based on Brillouin optical time domain reflectometry (BOTDR). By using a Kalman filter, we improved the performance of the FP-LD based OTDR, and decreased the noise using the dual-stage FBG optical demultiplexer. Applying the two developed components to the BOTDR system and using a temperature compensating algorithm, we successfully demonstrated the simultaneous measurement of strain and temperature distributions under various experimental conditions. The observed errors in the temperature and strain measured using the developed sensing system were 0.6 °C and 50 με, and the spatial resolution was 1 m, respectively.
Keywords: Fabry-Perot laser diode; OTDR; BOTDR; distributed optical sensors; simultaneous temperature and strain measurement Fabry-Perot laser diode; OTDR; BOTDR; distributed optical sensors; simultaneous temperature and strain measurement
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kim, S.; Kwon, H.; Yang, I.; Lee, S.; Kim, J.; Kang, S. Performance of a Distributed Simultaneous Strain and Temperature Sensor Based on a Fabry-Perot Laser Diode and a Dual-Stage FBG Optical Demultiplexer. Sensors 2013, 13, 15452-15464.

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