Chemometric approach to the calibration of light emitting diode based optical gas sensors using high-resolution transmission molecular absorption data

Article

Mahbub, Parvez, Leis, John and Macka, Mirek. 2018. "Chemometric approach to the calibration of light emitting diode based optical gas sensors using high-resolution transmission molecular absorption data." Analytical Chemistry. 90 (10), pp. 5973-5976. https://doi.org/10.1021/acs.analchem.8b01295
Article Title

Chemometric approach to the calibration of light emitting diode based optical gas sensors using high-resolution transmission molecular absorption data

ERA Journal ID1612
Article CategoryArticle
AuthorsMahbub, Parvez (Author), Leis, John (Author) and Macka, Mirek (Author)
Journal TitleAnalytical Chemistry
Journal Citation90 (10), pp. 5973-5976
Number of Pages4
Year2018
Place of PublicationUnited States
ISSN0003-2700
1520-6882
Digital Object Identifier (DOI)https://doi.org/10.1021/acs.analchem.8b01295
Web Address (URL)https://pubs.acs.org/doi/10.1021/acs.analchem.8b01295
Abstract

ABSTRACT: Modeling the propagation of light from LED sources is problematic since the emission covers a broad range of wavelengths and thus cannot be considered as monochromatic. Furthermore, the lack of directivity of such sources is also problematic. Both attributes are characteristic of LEDs. Here we propose a HITRAN (high-resolution transmission molecular absorption database) based chemometric approach that incorporates not-perfect-monochromaticity and spatial directivity of near-infrared (NIR) LED for absorbance calculations in 1 − 6% methane (CH 4 ) in air, considering CH 4 as a model absorbing gas. We employed the absorbance thus calculated using HITRAN to validate the experimentally measured absorbance of CH 4 . The maximum error between the measured and calculated absorbance values were within 1%. The approach can be generalized as a chemometric calibration technique for measuring gases and gas mixtures that absorb emissions from polychromatic or not-perfect-monochromatic sources, provided the gas concentration, optical path length, as well as blank and attenuated emission spectra of the light source are incorporated into the proposed chemometric approach.

Keywordsgas detection, infrared LED, HITRAN
ANZSRC Field of Research 2020400909. Photonic and electro-optical devices, sensors and systems (excl. communications)
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Byline AffiliationsUniversity of Tasmania
School of Mechanical and Electrical Engineering
Institution of OriginUniversity of Southern Queensland
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