title: Performance of a distributed simultaneous strain and temperature sensor based on a Fabry-Perot laser diode and a dual-stage FBG optical demultiplexer.
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.
authors.affiliation: School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea. jeehk@knu.ac.kr.
authors.forename: Suhwan
authors.initials: S
authors.lastname: Kim
authors.forename: Hyungwoo
authors.initials: H
authors.lastname: Kwon
authors.forename: Injae
authors.initials: I
authors.lastname: Yang
authors.forename: Seungho
authors.initials: S
authors.lastname: Lee
authors.forename: Jeehyun
authors.initials: J
authors.lastname: Kim
authors.forename: Shinwon
authors.initials: S
authors.lastname: Kang