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Real Time Frequency Domain Processing Technique for Optic Fiber Fluorescence Temperature Sensor

Chunhai Hu

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Abstract

One kind of signal processing technique, real time frequency domain technique, for optical fiber fluorescence temperature sensor is studied. Representation of excitation light and response fluorescence and relation between excitation light modulation frequency and sampling frequency are given. The phase delay of fluorescence and excitation light is calculated by fast fourier transform for getting lifetime of fluorescence. According to the relation of temperature and fluorescence lifetime stored in EPROM, the temperature is obtained. The resolution of temperature is less than 1℃.

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What this paper is about

One kind of signal processing technique, real time frequency domain technique, for optical fiber fluorescence temperature sensor is studied. Representation of excitation light and response fluorescence and relation between excitation light modulation frequency and sampling frequency are given. The phase delay of fluorescence and excitation light is calculated by fast fourier transform for getting lifetime of fluorescence. According to the relation of temperature and fluorescence lifetime stored in EPROM, the temperature is obtained. The resolution of temperature is less than 1℃.

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Available abstract

One kind of signal processing technique, real time frequency domain technique, for optical fiber fluorescence temperature sensor is studied. Representation of excitation light and response fluorescence and relation between excitation light modulation frequency and sampling frequency are given. The phase delay of fluorescence and excitation light is calculated by fast fourier transform for getting lifetime of fluorescence. According to the relation of temperature and fluorescence lifetime stored in EPROM, the temperature is obtained. The resolution of temperature is less than 1℃.

Key concepts: Fluorescence, Optics, Optical fiber, SIGNAL (programming language), Materials science, Frequency domain, Fiber optic sensor, Signal processing

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