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

Citation

Mahbub, P and Leis, J and Macka, M, Chemometric approach to the calibration of light emitting diode based optical gas sensors using high-resolution transmission molecular absorption data, Analytical Chemistry pp. 1-4. ISSN 0003-2700 (2018) [Letter or Note in Journal]


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DOI: doi:10.1021/acs.analchem.8b01295

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 16% methane (CH4) in air, considering CH4 as a model absorbing gas. We employed the absorbance thus calculated using HITRAN to validate the experimentally measured absorbance of CH4. 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.

Item Details

Item Type:Letter or Note in Journal
Keywords:HITRAN, chemometrics, calibration of gas sensor, not-perfect-monochromaticity, spatial directivity, optical pathlength, emission spectra of LED
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Sensor Technology (Chemical aspects)
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Environmentally Sustainable Mineral Resource Activities
Objective Field:Management of Greenhouse Gas Emissions from Mineral Resource Activities
UTAS Author:Mahbub, P (Dr Parvez Mahbub)
UTAS Author:Macka, M (Professor Mirek Macka)
ID Code:125794
Year Published:2018
Web of Science® Times Cited:2
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2018-05-05
Last Modified:2018-07-19
Downloads:0

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