Aiming at the much measurement error caused by spectral superposition in a high-speed sampling of GaAs optical fiber temperature sensing technology, a concept of equivalent wavelength based on the local area of the reflection spectrum is proposed. The principle of shifting the absorption edge of the gallium arsenide semiconductor materials' reflection spectrum to a longer wavelength with the increase of temperature is the basis of this concept. This paper proposes a new temperature demodulation method and data processing flow based on the analysis of the equivalent wavelength. The standard temperature measurement system in this paper has verified the accuracy and stability of the demodulation method. The experimental results show that the measurement error is less than ±0.2°C; in the temperature range of -20°C~60°C. In the temperature range of 60°C~250°C, the measurement error is less than ±0.5°C.
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