Hilbert-Huang Transform Time-Frequency Analysis in \phi -OTDR Distributed Sensor

• Published in: IEEE photonics technology letters Vol. 26; no. 23; pp. 2403 - 2406
• Main Authors: Hui, Xiaonan, Zheng, Shilie, Zhou, Jinhai, Chi, Hao, Jin, Xiaofeng, Zhang, Xianmin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-12-2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Fourier transforms; High frequencies; Optical fiber sensors; Optical fibers; Reflectometers; Sensors; Signal resolution; Spectra; Time-domain analysis; Time-frequency analysis; Transforms; Vibration; Vibrations; time-frequency spectrum; Distributed optical fiber sensor; phase sensitive optical time domain reflectometer ( phi -OTDR); Hilbert-Huang transform (HHT)
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2014.2358262

Time-frequency analysis is a practical method to analyze the characteristics of vibration signals. We introduce the Hilbert-Huang transform (HHT) to the phase-sensitive optical time-domain reflectometer sensor system for time-frequency analysis. The Hilbert spectral analysis makes the instantaneous frequency meaningful, and acquires the high frequency resolution. Compared with other time-frequency analysis methods, such as the short-time Fourier transform and the continuous wavelet transform, HHT presents high frequency resolution for both stationary and nonstationary signals, and with much less time consuming.