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Fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor

A temperature sensor, fully distributed technology, applied in the field of temperature sensor and optical strain, can solve the problems of cross effect, affecting the detection result, expensive instrument, etc., achieve long life, improve signal-to-noise ratio, and reduce cost

Inactive Publication Date: 2009-12-02
WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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Problems solved by technology

Although the fully distributed fiber Brillouin time domain analyzer can detect temperature and strain at the same time, there are cross effects, which affect the detection results, and the instrument is expensive

Method used

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  • Fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor
  • Fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor
  • Fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor

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Embodiment Construction

[0028]Referring to Figure 1, the fully distributed optical fiber Rayleigh and Raman scattering photon strain and temperature sensors include a pulse laser 10, an integrated optical fiber wavelength division multiplexer 11, a sensing optical fiber 12, and three photoelectric receiving modules 13, 14, and 15 , digital signal processor 16, display 17 and alarm 18, integrated optical fiber wavelength division multiplexer 11 has five ports, wherein 1550nm input port is connected with pulse laser 10, COM output port is connected with sensing fiber 12, 1450nm output The port is connected with the input end of the first photoelectric receiving module 14, the 1660nm output port is connected with the input end of the second photoelectric receiving module 13, the 1550nm output port is connected with the input end of the third photoelectric receiving module 13, three photoelectric receiving modules 13, The output ends of 14 and 15 are respectively connected with the digital signal processo...

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Abstract

The invention discloses a fully distributed fiber Rayleigh and Raman scattering photon strain and temperature sensor, which is a sensor for positioning a measuring point by adopting a fiber Rayleigh and Raman fusion scattering sensing principle and using an optical time-domain reflection principle based on an integrated fiber wavelength division multiplexing technique. The sensor comprises pulsed laser, an integrated fiber wavelength division multiplexer, a sensor fiber, three photoelectric receiving modules, a digital signal processor, a display and an alarm. The sensor can simultaneously measure field deformations, cracks and temperatures without crossing one another. Fiber paved in a site is not electrified, resists electromagnetic interference, and is radiation resistant and corrosion resistant, and the fiber is not only a transmission medium but also a sensing medium. The sensor has the advantages of low cost, long service life, simple structure, good noise-signal ratio and good reliability, and is applicable to monitoring the production process of middle-short distance between 100 meters and 15 kilometers and large scale civil engineering and monitoring hazard forecasts.

Description

technical field [0001] The invention relates to an optical strain and temperature sensor, in particular to a fully distributed optical fiber Rayleigh and Raman scattering photon strain and temperature sensor. Background technique [0002] For a long time, in the field of engineering at home and abroad, large-scale civil construction, bridges, tunnels, petrochemical pipelines, oil storage tanks and power cables have mainly used electrical strain gauges and thermosensitive electric groups as strain and temperature sensors, and each sensor needs to be connected with wires. , forming a large-scale detection network, the structure is very complicated, this kind of sensor itself is charged, it is inherently unsafe, susceptible to electromagnetic interference, not resistant to corrosion, and cannot be positioned, not suitable for use in harsh environments, let alone applied geology Scenes of disasters and fires. [0003] The optical fiber sensor network developed in recent years c...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01K11/32G02F1/35G01K11/324
Inventor 张在宣
Owner WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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