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.
Highlights
Because of their merits such as wide bandwidth and stability to electromagnetic induction, optical fibers can overcome the limitations of traditional coaxial cables and optical fibers have been widely used for super-high-speed communication in the past few decades
We propose and demonstrate a Brillouin optical time domain reflectometry (BOTDR) system employing a low-cost Fabry-Perot laser diode (FP-LD), which effectively compensates for extrinsic loss, and a dual-stage fiber Bragg grating (FBG) optical demultiplexer for noise reduction
We evaluated the performance of the developed BOTDR system by employing an FP-LD based
Summary
Because of their merits such as wide bandwidth and stability to electromagnetic induction, optical fibers can overcome the limitations of traditional coaxial cables and optical fibers have been widely used for super-high-speed communication in the past few decades. There have been many studies on transmission media for communication as well as on sensor systems that remotely measure strain or temperature by analyzing reflected or backscattered light intensity [1,2,3]. Optical fiber is a passive sensing material that does not consume electrical power. Its durability enables a long time measurement of the target object, and its stability to electromagnetic interference guarantees high reliability. Compared with optical fiber sensor systems using Raman backscattering, distributed systems using. Brillouin scattering have low threshold power as well as the ability to simultaneously measure temperature and strain. Many studies of various distributed measurements using spontaneous and stimulated Brillouin scattering have been undertaken.
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