A Continuous Wavelet Transform Based Time Delay Estimation Method for Long Range Fiber Interferometric Vibration Sensor

作者：Ma, Chunyu; Liu, Tiegen; Liu, Kun^*; Jiang, Junfeng^*; Ding, Zhenyang; Huang, Xiangdong; Pan, Liang; Tian, Miao; Li, Zhichen

来源：Journal of Lightwave Technology, 2016, 34(16): 3785-3789.

DOI：10.1109/JLT.2016.2583938

• Asymmetric dual Mach-Zehnder interferometer (ADMZI)
• continuous wavelet transform
• long range vibration sensing
• time-frequency analysis method
• time delay estimation method

We propose a time delay estimation (TDE) method based on a continuous wavelet transform (CWT), which can be applied to the different-wavelength-based fiber interferometric vibration sensors. Using a CWT-based characteristic extraction algorithm, we successfully eliminate the asymmetry of the interference outputs that would seriously deteriorate the positioning accuracy of the sensor. A positioning measurement experiment using an asymmetric dual Mach-Zehnder interferometric sensor was carried out to verify the effectiveness of the proposed method. The experiment achieved a positioning accuracy of 0.029% at the sensing length of 85 km, with a mean processing time of 591.2 ms.

• 出版日期2016-8-15
• 单位天津大学