Long range multiplexed sensors based on identical Bragg gratings with ultra-low reflectivity

M. G. Shlyagin; Luis Antonio Arias Castro; Rodolfo Martínez Manuel; S. V. Miridonov

doi:10.1117/12.848874

7 April 2010 Long range multiplexed sensors based on identical Bragg gratings with ultra-low reflectivity

M. G. Shlyagin, Luis Antonio Arias Castro, Rodolfo Martínez Manuel, S. V. Miridonov

Proceedings Volume 7648, Smart Sensor Phenomena, Technology, Networks, and Systems 2010; 764805 (2010) https://doi.org/10.1117/12.848874
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

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.

Citation Download Citation

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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