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Published on: November 8, 2019

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

Maria Giulia Delli Santi¹, Salvatore Castrignano¹, Marialuisa Capezzuto¹

¹Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (CNR-INO), Via Campi Flegrei 34, 80078 Pozzuoli, Italy.

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Summary

This study presents a novel optical fiber sensor system for simultaneous, multiparametric analysis of liquid samples. The compact, integrated setup enables real-time spectral and refractive index measurements.

Keywords:

NIR spectroscopy fiber optics sensors lab-on-fiber sensors multiparametric analysis portable spectrometers

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Published on: September 23, 2021

Area of Science:

Optoelectronics
Spectroscopy
Chemical Sensing

Background:

Multiparametric analysis of liquid samples is crucial for various applications.
Existing methods often require complex and bulky setups.
Integrating multiple optical fiber sensors offers a potential solution for miniaturization.

Purpose of the Study:

To develop a compact sensing scheme for simultaneous multiparametric analysis of liquid analytes.
To integrate multiple optical fiber sensors within a near-infrared spectrometer.
To validate the proposed method for real-time spectral and refractive index measurements.

Main Methods:

A broadband radiation source is encoded into a time-domain interferogram.
The encoded signal is distributed to multiple sensing units for simultaneous sample interrogation.
Spectral readout is achieved using Fourier transform routines on output signals.
A plasmonic nanostructured fiber probe and transmission cuvette were employed for validation.

Main Results:

Demonstrated simultaneous measurement of absorption spectrum and refractive index.
Successfully performed multiparametric analysis of water-methanol solutions.
Validated the integration of sensing units within a robust telecom optical fiber.

Conclusions:

The proposed optofluidic method enables compact and simultaneous multiparametric analysis of liquid samples.
The integrated optical fiber sensor system offers a robust and versatile platform for chemical sensing.
This approach simplifies complex spectral and refractive index measurements.