Journal
SENSORS
Volume 22, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/s22239377
Keywords
optofluidics; Fabry-Perot; refractive index; real-time measurement
Funding
- Project AROMA
- FEDER
- CENTRO2020-Programa Operacional Regional do Centro
- National funds (OE) [CENTRO-01-0145-FEDER-031568]
- FCT/MCTES [PTDC/EEI-EEE/31568/2017, UIDB/50025/2020, UIDP/50025/2020]
- Research fellowships [BIPD/UI96/9903/2021, 1420-09-5369-FSE-000001 (ARDITI), CEEC-IND/00777/2018]
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This work presents a 3D-printed optofluidic fiber sensor that can measure refractive index in real time. By combining a microfluidic system with an optical fiber extrinsic Fabry-Perot interferometer, a microfluidic chip platform was developed using 3D printing. The sensor showed good stability and sensitivity when characterized using different concentrations of glucose solutions.
This 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 mu L/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 (r(2) = 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 x 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.
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