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Low-Cost Interrogation Technique for Dynamic Measurements with FBG-Based Devices

Rodriguez, C. ; Leitão, C. Leitão ; Marques, C. ; Domingues, M. F. ; Alberto, N. ; Pontes, M. J. ; Frizera-Neto, A. Frizera-Neto ; R. N. Ribeiro, M. R. N. Ribeiro ; André, P.S ; Antunes, P.

Sensors Vol. 17, Nº 10, pp. 2414 - -10, September, 2017.

ISSN (print): 1424-3210
ISSN (online): 1424-8220

Scimago Journal Ranking: 0,58 (in 2017)

Digital Object Identifier: 10.3390/s17102414

Fiber Bragg gratings are widely used optical fiber sensors for measuring temperature and/or mechanical strain. Nevertheless, the high cost of the interrogation systems is the most important drawback for their large commercial application. In this work, an in-line Fabry–Perot interferometer based edge filter is explored in the interrogation of fiber Bragg grating dynamic measurements up to 5 kHz. Two devices an accelerometer and an arterial pulse wave probe
were interrogated with the developed approach and the results were compared with a commercial interrogation monitor. The data obtained with the edge filter are in agreement with the commercial
device, with a maximum RMSE of 0.05 being able to meet the requirements of the measurements. Resolutions of 3.6 pm and 2.4 pm were obtained, using the optical accelerometer and the arterial
pulse wave probe, respectively.