Temperature sensing demodulation device and demodulation method based on microwave photon filter

Abstract

The invention discloses a temperature sensing demodulation device and a demodulation method based on a microwave photonic filter. The microwave photonic filter comprises a multi-wavelength fiber laser and a dispersion fiber, which are used to form laser light and couple and output the laser light; The inductive demodulation device includes an electro-optical modulator, a microwave signal source, a photodetector, an electric power meter and a temperature demodulator; the electro-optical modulator is used to modulate the coupled laser to output a modulated optical signal; the dispersive fiber is used to sample the modulated optical signal when Delay to output the time-delayed optical signal; the photodetector is used to recover the time-delayed optical signal to obtain the electrical signal; the electric power meter is used to measure the power of the electrical signal; the temperature demodulator is used to scan the frequency of the microwave signal, and the The maximum power of the electrical signal obtains the corresponding microwave signal frequency, and obtains the temperature change information induced by the optical fiber sensor; thus, the optical fiber temperature sensing and demodulation can be realized through a simple structure, and at the same time, 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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