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7 April 2010 Long range multiplexed sensors based on identical Bragg gratings with ultra-low reflectivity
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Abstract
We present very simple and sensitive techniques capable to interrogate ultra-weak Bragg gratings written in a long SMF-28 fiber. The techniques are suitable for distributed detection and localization of alarm conditions in early warning systems. Also, a high multiplexing capability was demonstrated in a multi-point measuring system utilizing an array of identical FBGs. This technique is based on measuring correlation between the probe and reflected signal. A DFB laser operating in a CW regime was used as a light source. We present results of experimental verification of the techniques in different sensor configurations for static strain and vibration measuring. Multipoint sensor using Bragg gratings with reflectivity of 0.01% printed in a 3-km long fiber was demonstrated.
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M. G. Shlyagin, Luis Antonio Arias Castro, Rodolfo Martínez Manuel, and S. V. Miridonov "Long range multiplexed sensors based on identical Bragg gratings with ultra-low reflectivity", Proc. SPIE 7648, Smart Sensor Phenomena, Technology, Networks, and Systems 2010, 764805 (7 April 2010); https://doi.org/10.1117/12.848874
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