A data processing method for temperature demodulation of an optical fiber temperature sensor

Abstract

The invention discloses a data processing method for temperature demodulation of an optical fiber temperature sensor. , calculate the spectral reflectance of the reflected light of the optical fiber temperature sensor; normalize the calculated spectral reflectance of the reflected light of the optical fiber temperature sensor; according to the calculated normalized value of the spectral reflectance of the reflected light of the optical fiber temperature sensor According to the specific normalized value in , the specific wavelength value corresponding to the specific normalized value is calculated; according to the calculated specific wavelength value, the temperature wavelength calibration table is searched to obtain the temperature value corresponding to the specific wavelength value. The invention directly establishes the relationship between the wavelength and the temperature based on the spectral temperature demodulation method of the wavelength, and avoids being affected by factors such as the intensity of the light source, so the measurement is accurate, the calculation amount is small, the precision is high, and the stability is good.

Description

technical field [0001] The invention relates to a data processing method for temperature demodulation of an optical fiber temperature sensor. Background technique [0002] As an important physical parameter, temperature occupies a very important position in engineering applications and scientific research. Traditional temperature sensors represented by thermocouples, platinum alloys and semiconductors have the advantages of simple principle, high measurement accuracy and low cost. It is widely used in various fields such as national economy and national defense construction. However, compared with traditional temperature sensing, optical fiber temperature sensing has many advantages: light waves do not generate electromagnetic interference, are not afraid of electromagnetic interference, are easily received by various photodetection devices, can be easily converted into photoelectric or electro-optic, and are easily compatible with altitude. The developed modern electronic ...

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Problems solved by technology

[0003] In the prior art, the photodetector is used to directly establish the algorithm relationship between light intensity and temperature to obtain the measured temperature, but the light intensity value is easily affected by many factors such as light source intensity changes, optical fiber bending, extrusion, impurities, unevenness, and optical fiber docking. Influence, so it will cause inaccurate temperature measurement and poor stability

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