Nanowire humidity optical sensor system based on fast Fourier transform technique

S. Rota-Rodrigo; R. Pérez-Herrera; A. Lopez-Aldaba; M. C. López Bautista; O. Esteban; M. López-Amo

doi:10.1117/12.2194813

28 September 2015 Nanowire humidity optical sensor system based on fast Fourier transform technique

S. Rota-Rodrigo, R. Pérez-Herrera, A. Lopez-Aldaba, M. C. López Bautista, O. Esteban, M. López-Amo

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96342H (2015) https://doi.org/10.1117/12.2194813
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

In this paper, a new sensor system for relative humidity measurements based on its interaction with the evanescent field of a nanowire is presented. The interrogation of the sensing head is carried out by monitoring the fast Fourier transform phase variations of one of the nanowire interference frequencies. This method is independent of the signal amplitude and also avoids the necessity of tracking the wavelength evolution in the spectrum, which can be a handicap when there are multiple interference frequency components with different sensitivities. The sensor is operated within a wide humidity range (20%–70% relative humidity) with a maximum sensitivity achieved of 0.14rad/% relative humidity. Finally, due to the system uses an optical interrogator as unique active element, the system presents a cost-effective feature.

Citation Download Citation

S. Rota-Rodrigo, R. Pérez-Herrera, A. Lopez-Aldaba, M. C. López Bautista, O. Esteban, and M. López-Amo "Nanowire humidity optical sensor system based on fast Fourier transform technique", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96342H (28 September 2015); https://doi.org/10.1117/12.2194813

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