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Fiber optic Raman distributed temperature sensor based on an ultrashort pulse mode-locked fiber laser
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Paper Abstract

Nowadays fiber optic Raman distributed temperature sensors (RDTS) are broadly used for e.g. fire detection, gas leaks detection in pipelines and aircraft icing monitoring. The most common sources of probe pulses for RDTS are CW lasers with external intensity modulation or Q-switched lasers with a pulse duration of several tens of nanoseconds which limits the RDTS effective spatial resolution to a few meters. In this paper we have developed an Er-doped ultrashort pulse (USP) mode-locked fiber laser and implemented it to Raman distributed temperature sensor.This feature allow us to achieve high spatial resolution (down to several centimeters) and high signal-to-noise ratio in the receiving system. An all-fiber erbium-doped laser of 180 fs pulse duration and an average output power of 30 mW was used as a source of probing pulses. We have studied limiting factors of fiber sensor effective length such as high pulse repetition rate of 12.2 MHz and intensity noise of the USP laser (relative intensity noise RIN ~ 6.3 ∙ 10-4). Furthermore, the peak power of the USP laser has to be at kW level to get high signal-to-noise ratio in the receiving system and pulse duration < 100 ps at full-width-half-maximum for desirable spatial resolution of ~2 cm. Moreover, we have developed an experimental prototype of RDTS with the spatial resolution of ~ 0.1 m limited by the receiving system according to the detector bandwidth of 2 GHz, the effective sensor length of 3 m and ±1.5 °C temperature measurement error. As a result, a list of requirements for a new laser source for distributed temperature sensor was formulated.

Paper Details

Date Published: 11 April 2019
PDF: 6 pages
Proc. SPIE 11028, Optical Sensors 2019, 110281I (11 April 2019); doi: 10.1117/12.2520385
Show Author Affiliations
Yan Zh. Ososkov, Bauman Moscow State Technical Univ. (Russian Federation)
Anton O. Chernutsky, Bauman Moscow State Technical Univ. (Russian Federation)
Dmitriy A. Dvoretskiy, Bauman Moscow State Technical Univ. (Russian Federation)
Stanislav G. Sazonkin, Bauman Moscow State Technical Univ. (Russian Federation)
Ilya O. Orekhov, Bauman Moscow State Technical Univ. (Russian Federation)
Alexey B. Pniov, Bauman Moscow State Technical Univ. (Russian Federation)
Valeriy E. Karasik, Bauman Moscow State Technical Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 11028:
Optical Sensors 2019
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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