Temperature sensing method and device based on dual-core optical fiber

Abstract

The invention discloses a temperature sensing method and device based on a double-core optical fiber. The existing optical fiber sensing technology has the disadvantages of small temperature measuring range, high demodulation cost and the like. The device disclosed by the invention is characterized in that the output port of a broadband light source is in optical fiber connection with the input port of a single-mode optical fiber section; the output port of the single-mode optical fiber section is connected with the input port of a double-core optical fiber; the output port of the double-coreoptical fiber is connected with the input port of another single-mode optical fiber section; and the output port of the single-mode optical fiber is in optical fiber connection with the input port ofan optical spectrum analyzer. The method disclosed by the invention is implemented by placing the double-core optical fiber in a measurement environment, and determining the temperature exerted on the double-core optical fiber by measuring the wavelength shift of transmittance spectra through the optical spectrum analyzer. The invention avoids electromagnetic interference, can realize remote sensing, and has the advantages of low price, compact structure, large measurement range and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for detecting temperature signals based on a double-core optical fiber and a device for realizing the method. Background technique [0002] Optical fiber technology has achieved great success in the field of optical communication, and similarly, sensing technology based on optical fiber is currently developing vigorously. Optical fiber can be used not only as a transmission medium for light waves, but also as a sensing medium. When the light wave is transmitted in the optical fiber, its characteristic parameters such as amplitude, phase, polarization state, and wavelength will change directly or indirectly due to external factors such as temperature, pressure, strain, magnetic field, electric field, displacement, etc. Therefore, the optical fiber can be used As a sensing element to detect physical quantities. Optical fiber sensing technology i...

AI Technical Summary

Problems solved by technology

However, the temperature sensing technology based on fiber Bragg gratings can only be applied to temperature sensing at temperatures less than about 400 degrees, and has disadvantages such as high demodulation costs

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