Simultaneous measurement of humidity and vibration based on a nanowire sensor system using Fast Fourier Transform technique

Open Access

Abstract

This paper presents a new sensor system for vibration and relative humidity measurements based on its interaction with the evanescent field of a microwire. The interrogation of the sensing head is carried out by monitoring the fast Fourier transform (FFT) phase of one of the FFT peaks of the microwire transmission signal. This technique is not dependent of the signal amplitude and also eludes the requisite of tracking the wavelength evolution in the spectrum, which can be a handicap when there are multiple interference frequency . ; This work was supported in part by the Spanish Comisión Interministerial de Ciencia y Tecnología within project TEC2013-47264-C2-2-R and SUDOE ECOAL-MGT and FEDER funds from the European Union.