Raman-scattering-based method and device for simultaneously measuring temperature and strain of identical weak fiber gratings

A weak fiber grating and Raman scattering technology, applied in measurement devices, instruments, etc., can solve the problems of inconvenient engineering installation, the influence of reference fiber measurement accuracy system measurement accuracy, etc., to reduce the cost of layout and installation, high-precision sensing, The effect of reducing insertion loss

Inactive Publication Date: 2014-03-26
WUHAN UNIV OF TECH +1
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Problems solved by technology

However, this method brings inconvenience to the engineering installation, and the measurement a

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  • Raman-scattering-based method and device for simultaneously measuring temperature and strain of identical weak fiber gratings

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, specific embodiment of the present invention is described in further detail:

[0019] Such as figure 1 As shown, a device for simultaneously measuring the temperature and strain of an identical weak fiber grating based on Raman scattering of the present invention includes a broadband light source 1, a high-power laser 2, a pulse generator 5, two SOA optical switches 4, 9, and three Port circulator 6, coarse wavelength division multiplexer 7, large-capacity fiber grating array fiber 8, Raman temperature demodulation module 11, high-speed CCD wavelength demodulation module 10 and computer control unit 12. The broadband light source 1 and the high power laser 2 are connected to the first SOA optical switch 4 through a coupler 3 . The computer control unit 12, the pulse generator 5 and the first SOA switch 4 are sequentially connected for pulse signal modulation. The three ports of the three-port circulator 6 are respectivel...

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Abstract

The invention discloses a Raman-scattering-based method and device for simultaneously measuring the temperature and the strain of identical weak fiber gratings. According to the method and device, by the utilization of the wire-drawer-tower technology, ultralow-reflectivity identical weak fiber gratings are dynamically and continuously inscribed through single pulse energy to serve as a sensing probe; after modulation of pulse signals is performed, Bragg reflection signals and backward Raman scattering signals of the sensing probe are sent to a high-speed CCD wavelength demodulation module and a Raman temperature demodulation module respectively; temperature distribution T[i] at all the fiber gratings and reflection center wavelength lambda[i] of the fiber gratings are obtained respectively; temperature measurement of the Raman temperature demodulation module serves as temperature compensation data of strain measurement, and measurement data of the high-speed CCD wavelength demodulation module serve as correction for temperature measurement. The method and device can overcome the defects that the Raman sensing technology is low in accuracy and speed, and strain can not be measured, meanwhile, large capacity weak optical grating array fiber cabling complexity and operability can also be simplified, and cross sensitivity of the temperature and the strain of the gratings is avoided.

Description

technical field [0001] The invention relates to a quasi-distributed identical weak fiber grating sensing and its demodulation technology, in particular to a method and device for simultaneously measuring the temperature and strain of an identical weak fiber grating based on Raman scattering. Background technique [0002] Temperature and strain are two key test parameters for structural health checks of large systems. The stress state of the local key positions of the structure is directly related to the safe service state of the structure, and the temperature has a greater impact on large-volume structures such as concrete dams and foundation pits. The action of temperature and stress often leads to damage such as microcracks inside the structure. Simultaneously and accurately measuring the temperature and strain of large structures has always been an engineering challenge due to the cross-sensitivity of temperature and strain. [0003] Distributed Raman optical fiber sensi...

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Application Information

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IPC IPC(8): G01D21/02
Inventor 唐健冠陈宏利邓艳芳余海湖杨明红张翠于翔姜德生
Owner WUHAN UNIV OF TECH
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