High-resolution fiber optic temperature sensors using nonlinear spectral curve fitting technique

High-resolution fiber optic temperature sensors using nonlinear spectral curve fitting technique

A generic new data processing method is developed to accurately calculate the absolute optical path difference of a low-finesse Fabry-Perot cavity from its broadband interference fringes. The method combines Fast Fourier Transformation with nonlinear curve fitting of the entire spectrum. Modular fun...

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Veröffentlicht in:Review of scientific instruments 2013-04, Vol.84 (4), p.045002-045002
Hauptverfasser: Su, Z H, Gan, J, Yu, Q K, Zhang, Q H, Liu, Z H, Bao, J M
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container_title Review of scientific instruments
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creator Su, Z H
Gan, J
Yu, Q K
Zhang, Q H
Liu, Z H
Bao, J M
description A generic new data processing method is developed to accurately calculate the absolute optical path difference of a low-finesse Fabry-Perot cavity from its broadband interference fringes. The method combines Fast Fourier Transformation with nonlinear curve fitting of the entire spectrum. Modular functions of LabVIEW are employed for fast implementation of the data processing algorithm. The advantages of this technique are demonstrated through high performance fiber optic temperature sensors consisting of an infrared superluminescent diode and an infrared spectrometer. A high resolution of 0.01 °C is achieved over a large dynamic range from room temperature to 800 °C, limited only by the silica fiber used for the sensor.
doi_str_mv 10.1063/1.4802684
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title High-resolution fiber optic temperature sensors using nonlinear spectral curve fitting technique
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