Multi-parameter distributed measurement system and measuring method of dual-core weak grating array based on dark pulse light source

A measurement system and dark pulse technology, applied in the field of multi-parameter distributed measurement systems, can solve the problems of low measurement accuracy and spatial resolution, difficulty in ensuring that the optical fiber is not disturbed by stress, single sensing function, etc., so as to improve the spatial resolution. high rate and measurement accuracy, simple and practical structure, and high spatial resolution
CN107036733AActive Publication Date: 2017-08-11WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV OF TECH
Publication Date
2017-08-11

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Abstract

The invention relates to a multi-parameter distributed measurement system and measuring method of a dual-core weak grating array based on a dark pulsed light source. The system includes a broadband dark pulse light source, a weak grating array, a dual-core fiber, a photoelectric conversion unit, a fiber delay line, a notch filter, an information collection unit, a computer, a dual-core fiber coupler. The system utilizes high-intensity Rayleigh scattered light excited by high-power stable background light of a pulse width tunable dark pulse light source for distributed measurement; meantime, the system uses the dark pulse and weak grating array of the light source to carry out spatial segmented positioning of the Rayleigh scattering in the whole fiber range in order to improve the spatial resolution and measurement precision of a sensing system, and realizes simultaneous precise measurement of temperature and strain and precise positioning in an interval. The system has the advantages of simple structure, fast response speed and high spatial resolution, and can realize the distributed optical fiber sensing measurement of temperature and strain parameters at the same time with high precision.
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Description

technical field

[0001] The invention relates to a multi-parameter distributed measurement system, more specifically, relates to a multi-parameter distributed measurement system based on a double-core weak grating array of a dark pulse light source. Background technique

[0002] With the development of science and technology and the improvement of the application requirements of the Internet of Things, the optical fiber sensing network is developing in the direction of large capacity and multi-parameter measurement. The distributed optical fiber sensing network based on Rayleigh scattering, Brillouin scattering and Raman scattering is The measurement of physical parameters such as temperature and strain at various points continuously distributed in space in high voltage, strong magnetic field interference, high current, complex geometric space, flammable, explosive and other harsh environments provides a feasible new method. Distributed optical fiber sensing technology is dev...

Claims

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