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

Mahbub, Parvez and 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. ISSN 0003-2700

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 22 May 2018 00:36
Last Modified: 29 May 2018 01:20
Uncontrolled Keywords: gas detection, infrared LED, HITRAN
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090606 Photonics and Electro-Optical Engineering (excl. Communications)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970110 Expanding Knowledge in Technology
Identification Number or DOI: 10.1021/acs.analchem.8b01295
URI: http://eprints.usq.edu.au/id/eprint/34091

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