Differential reflectometry of FBG sensors in the wide spectral range |
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| Authors: | Yu N Kulchin O B Vitrik A V Dyshlyuk A M Shalagin S A Babin I N Nemov |
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| Institution: | (1) Institute of Automatics and Control Processes, Far Eastern Branch, Russian Academy of Sciences (IAPU DVO RAN), Vladivostok, Russia;(2) Institute of Automatics and Electrometry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia |
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| Abstract: | The paper presents a reflectometric technique for interrogation of multiple fiber Bragg grating (FBG) sensors based on conventional
optical time domain reflectometry (OTDR). The method proposed rests on the differential measurement of FBGs’ response to a
short probing laser pulse. Implementation of differential measurement principle using several reference FBGs allowed us to
eliminate the susceptibility of the system to intensity fluctuations as well as to increase the measurement range as compared
to the previous developments. The experimental threshold sensitivity amounted to ∼50 microstrain with the measurement range
being defined by the number of reference FBGs and limited only by optical fiber tensile strength. Due to its simplicity, efficiency
and usage of conventional OTDR equipment the proposed FBG interrogation technique can find a wide range of applications dealing
with strain and temperature measurements. |
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