공간 선택적 브릴루앙 산란을 이용한분포형 광섬유 센서의 시뮬레이션
Simulation of Distributed Optical Fiber Sensors Using Spatially-Selective Brillouin Scattering
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초록
광주파수 변조된 펌프와 프로브 빛의 광섬유 내 중첩을 시간 영역에서 직접 다루는 방법으로 공간 선택적 브릴루앙 산란 방식의 분포형 광섬유 센서를 시뮬레이션 하였다. 광섬유 내 브릴루앙 이득 분포의 시간/공간적 변화를 구하였고, 이종 광섬유의 접속과 온도 분포가 존재하는 경우에 대해 시뮬레이션 하여 분포형 센서로서 합당한 결과를 얻었다. 변조 파형으로서 정현파 대신에 삼각파를 이용한 경우에 정현파에 비해 공간 분해능 면에서 유리한 것으로 나타났다.
Abstract
We implement numerical simulations for the distributed optical fiber sensor system that uses the spatially-selective Brillouin scattering, by treating the superposition of the optical-frequency-modulated pump/probe waves in the time domain. We obtain temporal and spatial distributions of Brillouin gain for various cases. Simulations are applied to the case of concatenated optical fibers of different kinds and the case of distributed temperature along the fiber, which give reasonable results for the distributed sensor. The result of using a triangular wave instead of a sinusoidal one as a modulation waveform shows that the triangular wave modulation has an advantage in spatial resolution.
참고문헌 (13)
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