Space-frequency analysis with parallel computing in a phase-sensitive optical time-domain reflectometer distributed sensor

作者：Hui, Xiaonan; Ye, Taihang; Zheng, Shilie^*; Zhou, Jinhai; Chi, Hao; Jin, Xiaofeng; Zhang, Xianmin

来源：Applied Optics, 2014, 53(28): 6586-6590.

DOI：10.1364/AO.53.006586

• FIBER

For a phase-sensitive optical time-domain reflectometer (phi-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.

• 出版日期2014-10-1
• 单位浙江大学