Thermal radiation assisted hybrid demodulation method for fiber microcavity interferometric spectrum

By employing a thermal radiation-assisted fiber microcavity interferometric spectral hybrid demodulation method, which utilizes Fourier transform and multi-wavelength colorimetry to invert temperature values, the thermal radiation noise problem of fiber microcavity FP interferometer sensors under extreme environments is solved, achieving high-precision demodulation results.

CN122108220APending Publication Date: 2026-05-29TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2026-03-24
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In extreme environments, the thermal radiation background signal of fiber optic microcavity FP interferometers leads to a deterioration in the signal-to-noise ratio and a decrease in demodulation accuracy. Traditional methods are complex and costly, and it is difficult to effectively suppress thermal radiation noise.

Method used

By employing a thermal radiation-assisted fiber microcavity interferometric spectral hybrid demodulation method, thermal radiation noise is converted into an effective signal. The auxiliary temperature value is then retrieved using Fourier transform and multi-wavelength colorimetry to establish a cavity length-temperature conversion model, constraining the search range of interference fringe order and achieving accurate demodulation.

Benefits of technology

It significantly improves demodulation accuracy and reliability, eliminates stage jumps, reduces hardware modification costs, and is suitable for upgrading existing sensing systems.

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Abstract

The application discloses a kind of thermal radiation assisted optical fiber microcavity interferometric spectrum hybrid demodulation methods, it is related to optical fiber sensing and photoelectric detection technical field.The application includes: collecting original interference spectrum and pre-processing;Wave number conversion and interpolation;Fast Fourier transform gets spectrogram;Filtering separates interference signal and the composite signal containing light source and thermal radiation;Subtract light source spectrum and get thermal radiation signal, multi-wavelength colorimetric method is inverted auxiliary temperature value;With the value constraint interference fringe order search range, accurately calculate cavity length, and then inverse thermal expansion model obtains accurate temperature.The application discloses a kind of thermal radiation assisted optical fiber microcavity interferometric spectrum hybrid demodulation methods, it is converted from noise signal to effective temperature measuring signal to thermal radiation, combined with order jump constraint mechanism, improve the demodulation instability problem caused by signal-to-noise ratio decline due to thermal radiation under extreme high temperature, so that optical fiber sensing technology can be used for higher temperature high-speed stable measurement, in optical fiber microcavity high temperature sensing field has important application value.
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