title: Space-frequency analysis with parallel computing in a phase-sensitive optical time-domain reflectometer distributed sensor.
abstract: For a phase-sensitive optical time-domain reflectometer (ϕ-OTDR) distributed sensor system, space-frequency analysis can reduce the false alarm by analyzing the frequency distribution compared with the traditional difference value method. We propose a graphics processing unit (GPU)-based parallel computing method to perform multichannel fast Fourier transform (FFT) and realize the real-time space-frequency analysis. The experiment results show that the time taken by the multichannel FFT decreased considerably based on this GPU parallel computing. The method can be completed with a sensing fiber up to 16 km long and an entry-level GPU. Meanwhile, the GPU can reduce the computing load of the central processing unit from 70% down to less than 20%. We carried out an experiment on a two-point space-frequency analysis, and the results clearly and simultaneously show the vibration point locations and frequency components. The sensor system outputs the real-time space-frequency spectra continuously with a spatial resolution of 16.3 m and frequency resolution of 2.25 Hz.
authors.forename: Xiaonan
authors.initials: X
authors.lastname: Hui
authors.forename: Taihang
authors.initials: T
authors.lastname: Ye
authors.forename: Shilie
authors.initials: S
authors.lastname: Zheng
authors.forename: Jinhai
authors.initials: J
authors.lastname: Zhou
authors.forename: Hao
authors.initials: H
authors.lastname: Chi
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Jin
authors.forename: Xianmin
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D003196:Computer Graphics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D010783:Photometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D014159:Transducers