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High Rate Dynamic Monitoring with Fabry–Perot Interferometric Sensors: An Alternative Interrogation Technique Targeting Biomedical Applications

Domingues, M. F. ; Tavares, C. ; Alberto, N. ; Radwan, A. R. ; André, P.S ; Antunes, P.

Sensors Vol. 19, Nº 21, pp. 4744 - 4744, October, 2019.

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

Journal Impact Factor: 2,033 (in 2015)

Digital Object Identifier: 10.3390/s19214744

Fabry–Perot interferometric (FPI) sensors are an accurate and well-established sensing
technology that are used to monitor a wide range of parameters such as strain, temperature, and
refractive index, among many others. Nevertheless, due to the limited number and high cost of
existing interrogation techniques for FPIs, its use is often restricted to discrete measurements, not
being so explored for dynamic applications. The development of an alternative interrogation
technique for a high rate of acquisition may propel this type of sensor into less explored fields such
as dynamic biomedical applications. In this work, we present the theoretical and experimental
analyses of an FPI sensing architecture by using an alternative high rate dynamic acquisition
methodology, based on frequency to amplitude conversion, where the FPI spectral shift is detuned
by the convolution of the optical light source with the FPI interference pattern. The good agreement
between the theoretical and experimental results verified the reliability of the proposed
methodology. Moreover, preliminary results show that the developed sensing architecture can be a
suitable solution to monitor biomedical parameters such as the carotid pulse wave.