Tianjin University

Xuezhi Zhang

Junfeng Jiang

Tiegen Liu

Kun Liu

Shuang Wang

Zhenyang Ding

Qiliang Chu

Zhe Ma

Wenjie Chen

Chuanjun Zang

Guanhua Liang

Jinling Yan

Renwei Xie

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

The present invention discloses a Fiber Bragg Grating demodulation device with a suppressed fluctuation at a variable ambient temperature and a demodulation method. The device comprises a broadband light source (), an optical attenuator (), a tunable F-P filter (), a first optical fiber isolator (), an erbium-doped optical fiber amplifier (), an optical fiber first-stage beam splitter (), a first optical fiber second-stage beam splitter (), optical fiber circulators (), FBG sensor arrays (), a first photoelectric detector array (), an optical fiber gas cell (), a second optical fiber second-stage beam splitter (), an optical fiber F-P etalon (), a notch filter (), an optical fiber assisted interferometer (), a data acquisition card () and a processor ().

Fiber Bragg Grating demodulation device capable of supressing fluctuations at variable ambient temperature and demodulation method thereof

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Tianjin, China

Xuezhi Zhang