Pulse shape effects on the measurement of temperature using a Brillouin-based optical fiber sensor
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AuthorGalíndez Jamioy, Carlos Augusto; Madruga Saavedra, Francisco Javier; Cobo García, Adolfo; Conde Portilla, Olga María; López Higuera, José Miguel
© 2007 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Proceedings of SPIE, 2007, vol. 6572, 65720S
Enabling Photonics Technologies for Defense, Security, and Aerospace Applications III, Orlando (FL), 2007
SPIE Society of Photo-Optical Instrumentation Engineers
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Brillouin gain scattering
Distributed temperature measurements
Optical time domain analysis
Probe pulse shape
Distributed fiber sensing based on Brillouin gain scattering (BGS) principle is a useful way to develop devices capable to measure temperature or/and strain in optical fibers. New effects or technologies that could achieve a larger distance and/or a better spatial resolution are a topic of special interest in this fiber sensing area. The influence of the probe-pulse shape in the interaction between the pulsed light and the continuous wave laser in a pump-probe system is presented. The purpose of this study is to improve the spatial resolution of the measurement without losing stability in the BGS. Also it is showed how the backscattering Brillouin gain is affected by inducing variations on the final value of the BGS intensity; this effect is illustrated by using an experimental set up based on the Brillouin optical time-domain analysis (BOTDA). Theoretical analysis of the probe pulse in the Brillouin shift and intensity value using triangular, sinc and saw tooth shapes around the medium phonon life time (~10ns) are presented; as well as the experimental results and possible applications are explained.
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