Temperature sensing demodulation device and method based on microwave photon filter

Abstract

The invention discloses a temperature sensing demodulation device and method based on a microwave photon filter. The microwave photon filter comprises a multi-wavelength fiber laser and a dispersion optical fiber for forming a laser, and coupled output of the laser is carried out; the temperature sensing demodulation device comprises an electro-optic modulator, a microwave signal source, a photoelectric detector, an electric power meter and a temperature demodulator; the electro-optic modulator is used for modulating the coupled laser to output a modulated optical signal; the dispersion optical fiber is used for sampling delay of the modulated optical signal to output a delayed optical signal; the photoelectric detector is used for recovering the delayed optical signal to obtain an electrical signal; the electric power meter is used for measuring the power of the electrical signal; the temperature demodulator is used for scanning the microwave signal frequency and acquiring the corresponding microwave signal frequency according to the maximum power of the electrical signal measured by the electric power meter and obtaining temperature change information induced by an optical fibersensor; and optical fiber temperature sensing and demodulating are achieved through a simple structure, and meanwhile, the required cost is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing demodulation, in particular to a temperature sensing demodulation device and demodulation method based on a microwave photon filter. Background technique [0002] Optical fiber sensor has the characteristics of small size, light weight, easy to realize long-distance and distributed measurement, explosion-proof, electrical insulation and anti-electromagnetic interference, so it is widely used in the field of long-distance measurement of temperature, stress and refractive index. [0003] In the prior art, the structure of Michelson fiber interferometer and Mach-Zehnder fiber interferometer is mostly used to measure the wavelength change in the interference spectrum, and then judge the temperature change information through the change of wavelength in the interference spectrum; however, through these measurements The method has high requirements on the performance of the optical filter,...

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Problems solved by technology

[0003] In the prior art, the structure of Michelson fiber interferometer and Mach-Zehnder fiber interferometer is mostly used to measure the wavelength change in the interference spectrum, and then judge the temperature change information through the change of wavelength in the interference spectrum; however, through these measurements The method has high requirements on the performance of the optical filter, which leads to an increase in implementation cost, and its complex structure makes it difficult to be popularized in practical applications.

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