Optical fiber distributed temperature sensor using short term Fourier transform based simplified signal processing of Raman signals |
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| Affiliation: | 1. Fiber Optics Lab., SSLD, Raja Ramanna Centre for Advanced Technology (RRCAT), Dept. of Atomic Energy, Indore 452 013, India;2. Electronics Section, AMPD, Bhabha Atomic Research Centre (BARC), Dept. of Atomic Energy, Mumbai 400 085, India;1. Electrical Engineering Department, Tehran South Branch, Tehran, Iran;2. Shahid Sattari University, Tehran, Iran;1. Beijing Institute of Petrochemical Technology, School of Information Engineering, Beijing, 102617, China;2. Beijing University of Chemical Technology, School of Information Science and Technology, Beijing, 100029, China |
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| Abstract: | A simplified technique using short term Fourier transform to reduce the errors in distributed temperature measurement with a Raman scattering based optical fiber sensor system is presented. The two main sources of errors are differential attenuation to anti-Stokes and Stokes signal by fiber and local change in Stokes due to change in temperature. The proposed technique compensates these errors and extracts correct temperature profile in spite of practical difficulties encountered in applying the theoretical concept. Moreover proposed technique is less complex, self-reliant, can tolerate variation in laser power, requires less dead zone and suits automation using embedded solution. Results of measurement carried out, using the system developed at RRCAT, Indore, for two hot zones having spatial width of 1.9 m (kept at 56 °C) and 1.5 m (kept at 78 °C), located at 47 m and 85 m respectively, show that these parameters can be recovered with significantly small errors. |
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| Keywords: | Optical fiber Raman anti-Stokes Raman Stokes Distributed temperature sensing |
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