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Sensors 2018, 18(6), 1895;

Experimental Demonstration of Low-Uncertainty Calibration Methods for Bragg Grating Interrogators

Instituto de Óptica, CSIC, C/Serrano 121, 28006 Madrid, Spain
Instituto de Estructura de la Materia, CSIC, Serrano 123, 28006 Madrid, Spain
Instituto Mexicano del Petróleo—IMP, Ciudad de México 07730, México
Author to whom correspondence should be addressed.
Received: 8 May 2018 / Revised: 4 June 2018 / Accepted: 6 June 2018 / Published: 10 June 2018
(This article belongs to the Section Physical Sensors)
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In this paper we propose and demonstrate two alternative methods for the high-precision calibration of fiber Bragg grating (FBG) interrogators. The first method is based on the direct comparison between the wavelength measurements of the interrogator under test and a calibrated wavemeter, while analyzing a simulated symmetric Bragg grating constructed by a tunable filter and a fiber mirror. This first method is applicable to most commercial systems but presents an uncertainty limited by the spectral width and the wavelength stability of the tunable filter. The second method consists in measuring multiple reference absorption lines of calibrated absorption gas cells. This second method presents lower uncertainties, limited only by the optical resolution of the interrogator and the wavelength uncertainty of the reference cell absorption lines. However, it imposes more restrictive requirements on the interrogator software. Both methods were experimentally demonstrated by calibrating multiple commercial systems, reaching uncertainties down to 0.63 pm at a central wavelength of 1550 nm. View Full-Text
Keywords: fiber-optic sensors; fiber Bragg gratings interrogators; absolute calibration fiber-optic sensors; fiber Bragg gratings interrogators; absolute calibration

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de Miguel, J.L.; Galindo-Santos, J.; Pulido de Torres, C.; Salgado, P.; Velasco, A.V.; Corredera, P. Experimental Demonstration of Low-Uncertainty Calibration Methods for Bragg Grating Interrogators. Sensors 2018, 18, 1895.

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