China Jiliang University

China Jiliang Unviversity

Zaixuan Zhang

Jianfeng Wang

Chenxia Li

Wenping Zhang

Yi Li

Shangzhong Jin

Xiangdong Yu

Huaping Gong

Wensheng Zhang

Xiaohui Niu

A dispersion and loss spectrum auto-correction distributed optical fiber Raman temperature sensor has a dual fiber pulsed laser module with dual Raman wavelength shifts. The laser module is composed of a power supply (), an electronic switch (), a primary laser () and a secondary laser (), a first combiner (), a bidirectional coupler (), a multimode fiber (), an integrated optical fiber wavelength division multiplexer (), a second combiner (), a direct detection system (), a signal collection and processing system () and a display (). The sensor uses two light sources that have two Raman wavelength shifts, wherein the central wavelength of backward anti-Stokes Raman scattering peak of the primary light source coincides with that of the backward Stokes scattering peak center wavelength of the secondary light source, and the time domain reflection signal of the one-way optical fiber Rayleigh scattering is deducted. Based on the optical fiber Raman scattering temperature measurement principle, the dispersion and loss spectrum auto-correction method and the optical time domain reflection principle, the optical fiber dispersion and the loss spectrum can be self-corrected, and the random power loss caused by bending and stretching in installation can also be auto-corrected.

Dispersion and loss spectrum auto-correction distributed optical fiber raman temperature sensor

A distributed optical fiber sensor based on Raman and Brillouin scattering is provided. The distributed optical fiber sensor includes a semiconductor FP cavity pulsed wideband optical fiber laser (), a semiconductor external-cavity continuous narrowband optical fiber laser (), a wave separator (), an electro-optic modulator (), an isolator (), an Er-doped optical fiber amplifier (), a bidirectional coupler (), an integrated wavelength division multiplexer (), a first photoelectric receiving and amplifying module (), a second photoelectric receiving and amplifying module (), a direct detection system (), a narrowband optical fiber transmission grating (), a circulator () and a coherence detection module (). The temperature and the strain can be measured simultaneously, and the signal-to-noise ratio of the system is enhanced.

Distributed optical fiber sensor based on Raman and Brillouin scattering

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Zhejiang, China

Zaixuan Zhang