{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T11:52:45Z","timestamp":1768737165762,"version":"3.49.0"},"reference-count":14,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2013,11,12]],"date-time":"2013-11-12T00:00:00Z","timestamp":1384214400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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 \u00b0C and 50 \u03bc\u03b5, and the spatial resolution was 1 m, respectively.<\/jats:p>","DOI":"10.3390\/s131115452","type":"journal-article","created":{"date-parts":[[2013,11,12]],"date-time":"2013-11-12T10:43:07Z","timestamp":1384252987000},"page":"15452-15464","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Performance of a Distributed Simultaneous Strain and Temperature Sensor Based on a Fabry-Perot Laser Diode  and a Dual-Stage FBG Optical Demultiplexer"],"prefix":"10.3390","volume":"13","author":[{"given":"Suhwan","family":"Kim","sequence":"first","affiliation":[{"name":"School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea"}]},{"given":"Hyungwoo","family":"Kwon","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering and Computer Science, Kyungpook National University,  1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea"}]},{"given":"Injae","family":"Yang","sequence":"additional","affiliation":[{"name":"Mine Reclamation Corporation, Chungjindonggil 30, Jongro-gu, Seoul 110-727, Korea"}]},{"given":"Seungho","family":"Lee","sequence":"additional","affiliation":[{"name":"Mine Reclamation Corporation, Chungjindonggil 30, Jongro-gu, Seoul 110-727, Korea"}]},{"given":"Jeehyun","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea"}]},{"given":"Shinwon","family":"Kang","sequence":"additional","affiliation":[{"name":"School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2013,11,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"114","DOI":"10.1049\/pe:19950303","article-title":"Distributed fiber-optic temperature sensors. 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