Next Article in Journal
BlockSIEM: Protecting Smart City Services through a Blockchain-based and Distributed SIEM
Next Article in Special Issue
Self-Referenced Multifrequency Phase-Resolved Luminescence Spectroscopy
Previous Article in Journal
Energy Efficiency in RF Energy Harvesting-Powered Distributed Antenna Systems for the Internet of Things
Previous Article in Special Issue
Development of an Aptamer Based Luminescent Optical Fiber Sensor for the Continuous Monitoring of Hg2+ in Aqueous Media
Open AccessArticle

A Polynomial-Exponent Model for Calibrating the Frequency Response of Photoluminescence-Based Sensors

1
Department Signal Theory, Networking and Communications, University of Granada, 18071 Granada, Spain
2
By Techdesign S.L., 28500 Arganda del Rey (Madrid), Spain
3
Department of Analytical Chemistry, University of Granada, 18071 Granada, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(16), 4635; https://doi.org/10.3390/s20164635
Received: 8 July 2020 / Revised: 7 August 2020 / Accepted: 13 August 2020 / Published: 18 August 2020
(This article belongs to the Special Issue Calibration of Chemical Sensors Based on Photoluminescence)
In this work, we propose a new model describing the relationship between the analyte concentration and the instrument response in photoluminescence sensors excited with modulated light sources. The concentration is modeled as a polynomial function of the analytical signal corrected with an exponent, and therefore the model is referred to as a polynomial-exponent (PE) model. The proposed approach is motivated by the limitations of the classical models for describing the frequency response of the luminescence sensors excited with a modulated light source, and can be considered as an extension of the Stern–Volmer model. We compare the calibration provided by the proposed PE-model with that provided by the classical Stern–Volmer, Lehrer, and Demas models. Compared with the classical models, for a similar complexity (i.e., with the same number of parameters to be fitted), the PE-model improves the trade-off between the accuracy and the complexity. The utility of the proposed model is supported with experiments involving two oxygen-sensitive photoluminescence sensors in instruments based on sinusoidally modulated light sources, using four different analytical signals (phase-shift, amplitude, and the corresponding lifetimes estimated from them). View Full-Text
Keywords: calibration; chemical sensor; photoluminescence; oxygen sensing; frequency response; Stern–Volmer model; Lehrer model; Demas model; polynomial-exponent model calibration; chemical sensor; photoluminescence; oxygen sensing; frequency response; Stern–Volmer model; Lehrer model; Demas model; polynomial-exponent model
Show Figures

Figure 1

MDPI and ACS Style

Torre, A.; Medina-Rodríguez, S.; Segura, J.C.; Fernández-Sánchez, J.F. A Polynomial-Exponent Model for Calibrating the Frequency Response of Photoluminescence-Based Sensors. Sensors 2020, 20, 4635.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop