Multimode fiber-based method and multimode fiber-based system for simultaneously measuring temperature and strain

A multi-mode optical fiber and optical fiber technology, applied in the field of measurement, can solve problems such as difficult to achieve long-distance sensing, cross-sensitivity of optical fiber sensing, and insensitivity of reference optical fibers
CN104568019AInactive Publication Date: 2015-04-29NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2015-04-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of measurement, and particularly relates to a multimode fiber-based method and a multimode fiber-based system for simultaneously measuring temperature and strain. The system comprises a laser device, a first coupling device, a polarization controller, an electro-optical modulator, a pulse generator, a first optical amplifier, a first circulator, a first optical grating, a multimode circulator, a multimode optical fiber, a second optical amplifier, a second circulator, a second optical grating, a second coupler, a polarization scrambler, a photoelectric detector, a data application and processing module and a computer display module; by measuring two modes with different brillouin frequency shift-temperature coefficient and brillouin frequency shift-strain coefficient of the multimode optical fiber, a coefficient matrix is formed to realize the simultaneous measurement of the temperature and strain, the cross sensitivity problem in brillouin distribution type optical fiber sensing can be solved, the measurement precision is high, the positioning is accurate, and the cost is low.
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Description

technical field

[0001] The invention belongs to the technical field of measurement, and in particular relates to a method and system for simultaneously measuring temperature and strain based on a multimode optical fiber. Background technique

[0002] In addition to the advantages of general optical fiber sensors such as anti-electromagnetic interference, corrosion resistance, and good electrical insulation, the distributed optical fiber sensor also has the advantages of obtaining distribution information along the entire optical fiber measured field with only one measurement, high measurement accuracy, accurate positioning, and sensing The distance can reach hundreds of kilometers and other unique advantages, so it has broad application prospects. Among them, the distributed sensing technology based on optical fiber Brillouin scattering has higher measurement accuracy, measurement range and spatial resolution in temperature measurement than other sensing technologies, so thi...

Claims

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