Optrode-Assisted Multiparametric Near-Infrared Spectroscopy for the Analysis of Liquids

Year: 2024

Authors: Delli Santi M.G.; Castrignano S.; Capezzuto M.; Consales M.; Vaiano P.; Cusano A.; Gagliardi G.; Malara P.

Autors Affiliation: Consiglio Nazl Ric CNR, Ist Nazl Ott INO, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy; Univ Sannio, Engn Dept, Optoelect Grp, Cso Garibaldi 107, I-82100 Benevento, Italy.

Abstract: We demonstrate a sensing scheme for liquid analytes that integrates multiple optical fiber sensors in a near-infrared spectrometer. With a simple optofluidic method, a broadband radiation is encoded in a time-domain interferogram and distributed to different sensing units that interrogate the sample simultaneously; the spectral readout of each unit is extracted from its output signal by a Fourier transform routine. The proposed method allows performing a multiparametric analysis of liquid samples in a compact setup where the radiation source, measurement units, and spectral readout are all integrated in a robust telecom optical fiber. An experimental validation is provided by combining a plasmonic nanostructured fiber probe and a transmission cuvette in the setup and demonstrating the simultaneous measurement of the absorption spectrum and the refractive index of water-methanol solutions.

Journal/Review: SENSORS

Volume: 24 (3)      Pages from: 729-1  to: 729-7

KeyWords: fiber optics sensors; lab-on-fiber sensors; portable spectrometers; NIR spectroscopy; multiparametric analysis
DOI: 10.3390/s24030729

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