A sapphire fibre thermal probe based on fast Fourier transform and phase-lock loop |
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Authors: | Wang Yu-Tian Wang Dong-Sheng Ge Wen-Qian and Cui Li-Chao |
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Institution: | Department of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China |
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Abstract: | A sapphire fibre thermal probe with Cr3+ ion-doped end is developed by
using the laser heated pedestal growth method. The fluorescence thermal
probe offers advantages of compact structure, high performance and ability
to withstand high temperature in a detection range from room temperature to
450℃. Based on the fast Fourier transform (FFT), the fluorescence
lifetime is obtained from the tangent function of phase angle of the
non-zeroth terms in the FFT result. This method has advantages such as quick
calculation, high accuracy and immunity to the background noise. This FFT
method is compared with other traditional fitting methods, indicating that
the standard deviation of the FFT method is about half of that of the Prony
method and about 1/6 of that of the log-fit method. And the FFT method is immune
to the background noise involved in a signal. So,
the FFT method is an excellent way of processing signals. In addition,
a phase-lock amplifier can effectively suppress the noise. |
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Keywords: | fluorescence thermometer fast Fourier
transform phase-lock loop sapphire optical fibre |
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