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An optical fiber temperature vibration sensor and comprehensive monitoring system and method

A vibration sensor, optical fiber temperature technology, used in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of poor positioning accuracy, low accuracy, complex structure, etc., achieve high vibration detection sensitivity, and realize position detection. , the effect of reducing costs

Active Publication Date: 2017-10-13
WEIHAI BEIYANG ELECTRIC GRP CO LTD BEIJING BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, Chinese patent CN200910099463.7 discloses a fully distributed optical fiber Rayleigh and Raman scattering photon strain and temperature sensor, which uses Rayleigh scattering signals for stress monitoring and Raman scattered light for temperature monitoring, but the The relationship between the stress of the scheme and the fiber loss is calculated by a simulation model, and the accuracy is not high
Chinese patent CN201010566517.9 discloses a distributed optical fiber Brillouin sensor fused with an optical fiber Brillouin frequency shifter, using Brillouin technology to realize simultaneous measurement of temperature and stress, but the structure of the scheme is complex and expensive
Chinese patent CN201210059875.X discloses a distributed optical fiber sensing device and method for simultaneous measurement of vibration and temperature, using Rayleigh autocoherence for vibration detection and positioning, but the positioning accuracy is poor

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  • An optical fiber temperature vibration sensor and comprehensive monitoring system and method
  • An optical fiber temperature vibration sensor and comprehensive monitoring system and method
  • An optical fiber temperature vibration sensor and comprehensive monitoring system and method

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Embodiment 1

[0056] This embodiment provides a structural schematic diagram of an optical fiber temperature measurement and vibration sensor that simultaneously measures temperature and vibration, as shown in figure 1As shown, one pulse trigger signal output end of the data acquisition unit 10 is connected to the input end of the pulsed fiber laser 1, and the 1550nm pulsed light output by the pulsed fiber laser 1 is connected to the 1550nm input end of the 2*2 coupler 2, and the 2*2 coupling One output end of the coupler 2 is connected with the input end of the optical fiber delay line 3, the output end of the optical fiber delay line 3 is connected with a 5-a optical fiber of the optical fiber 5, and the other output end of the 2*2 coupler 2 is connected with the wavelength division multiplexing The 1550nm input terminal of the wavelength division multiplexer 4 is connected to the 1550nm input terminal, the com output terminal of the wavelength division multiplexer 4 is connected to the se...

Embodiment 2

[0063] This embodiment provides another optical fiber temperature measurement and vibration sensor that simultaneously measures temperature and vibration and an integrated monitoring system using the sensor. The schematic diagram of the structure is as follows image 3 shown, with figure 2 The optical fiber temperature measurement and vibration sensor and the comprehensive monitoring system using the sensor have the difference that: the light source is realized by a semiconductor laser 13 plus an optical amplifier 12, and the pulse trigger signal output by the data acquisition unit 10 drives the semiconductor laser 13 to realize a small For the power pulsed light signal, the low-power pulsed light outputs high-power pulsed light after passing through the optical amplifier 12. This method reduces the limitation on the power of the light source and has the characteristics of low cost.

[0064] In this embodiment, the semiconductor laser 13 has a central wavelength of 1550 nm, a...

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Abstract

The invention relates to the field of optical fiber sensing and safety protection, in particular to an optical fiber temperature vibration sensor capable of simultaneously monitoring temperature information and vibration information and a comprehensive monitoring system and method, which is characterized in that it includes a pulse laser and a 2*2 optical coupler , a first sensing optical fiber, a wavelength division multiplexer, a second sensing optical fiber, a back-to-back anti-Stokes signal photoelectric receiving module, a back-to-Stokes signal photoelectric receiving module, a Rayleigh scattering signal photoelectric receiving module, The coherent optical signal photoelectric receiving module is connected to the output terminals of the back anti-Stokes signal photoelectric receiving module, the back Stokes signal photoelectric receiving module, the Rayleigh scattering signal photoelectric receiving module and the coherent optical signal photoelectric receiving module The connected data acquisition unit, compared with the prior art, the present invention has higher vibration detection sensitivity.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and safety protection, in particular to an optical fiber temperature vibration sensor capable of simultaneously monitoring temperature information and vibration information, and a comprehensive monitoring system and method. Background technique [0002] The distributed optical fiber temperature sensor is a distributed optical fiber Raman temperature sensor composed of the principle that the spontaneous Raman scattering light intensity of optical fiber is modulated by temperature and the principle of optical time domain reflection, and has a broad application market. Because it can forecast the on-site temperature and its changing trend in real time online, and set the alarm temperature to monitor the on-site temperature change, it is an intrinsically safe linear temperature-sensitive detector, which has been successfully used in petroleum and petrochemical, electric power and ports, etc. field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01H9/00G01K11/324
Inventor 李德和王建强夏俊玲史振国
Owner WEIHAI BEIYANG ELECTRIC GRP CO LTD BEIJING BRANCH