Browsing by Author "Antunes, Paulo"
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- Multiparameter optical monitoring of Madeira winePublication . Pereira, Vanda; Marques, José Carlos; Carvalho, Maria João; Chen, Monchu; Sol, Ricardo; Novo, Catarina; Bilro, Lúcia; Antunes, Paulo; Alberto, Nélia; Pinto, João LemosMadeira wine vinification process has been most ly empiric and requiring further studies. The present paper describes the existing pilot plant facility in Madeira Univer sity, with the installed controlled systems and safety devices. An advanced multi-parameter platform for real time moni toring and interactive data visualization is described and its potential use demonstrated.
- Real-time measurement of refractive index using 3D-printed optofluidic fiber sensorPublication . Leça, João M.; Magalhães, Yannis; Antunes, Paulo; Pereira, Vanda; Ferreira, Marta S.; Leça, João MicaelThis work describes a 3D-printed optofluidic fiber sensor to measure refractive index in real time, combining a microfluidic system with an optical fiber extrinsic Fabry–Perot interferometer. The microfluidic chip platform was developed for this purpose through 3D printing. The Fabry–Perot cavity was incorporated in the microfluidic chip perpendicularly to the sample flow, which was of approximately 3.7 µL/s. The optofluidic fiber sensor platform coupled with a low-cost optical power meter detector was characterized using different concentrations of glucose solutions. In the linear regression analysis, the optical power shift was correlated with the refractive index and a sensitivity of −86.6 dB/RIU (r2 = 0.996) was obtained. Good results were obtained in terms of stability with a maximum standard deviation of 0.03 dB and a sensor resolution of 5.2 × 10−4 RIU. The feasibility of the optofluidic fiber sensor for dynamic analyses of refractive index with low sample usage was confirmed through real-time measurements.