Tianjin University

Guanhua Liang

Junfeng Jiang

Tiegen Liu

Kun Liu

Shuang Wang

Zhenyang Ding

Xuezhi Zhang

Wenjie Chen

Zhe Ma

The present invention discloses a differential COTDR distributed acoustic sensing device based on heterogeneous double-sideband chirped-pulses of the invention, comprising a light source (), a 1×2 polarization-maintaining optical-fiber coupler (), a dual Mach-Zehnder electro-optical modulator (), an arbitrary waveform generator (), a first low noise microwave amplifier (), a second low noise microwave amplifier (), an electro-optical modulator bias control panel (), a 1×2 optical-fiber coupler (), an erbium-doped optical-fiber amplifier (), an optical-fiber filter (), an optical-fiber circulator (), a sensing optical fiber (), a tricyclic polarization controller (), a 2×2 optical-fiber coupler (), a balanced photoelectric detector (), a data acquisition card () and a processing unit (). The present invention combines heterogeneous double-sideband chirped-pulse modulation and coherent light time-domain reflection technology, so as to double the sensitivity of the to-be-measured acoustic wave signal and to suppress common-mode noise, and further improves SNR.

Differential COTDR distributed acoustic sensing device and method based on heterogeneous double-sideband chirped-pulses

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Tianjin, China

Guanhua Liang