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Development of a toluene detector based on deep UV absorption spectrophotometry using glass and aluminum capillary tube gas cells with a LED source

Date
2019
Abstract
A simple deep-ultraviolet (UV) absorption spectrophotometer based on ultraviolet light-emitting diode (UV LED) was developed for the detection of air-borne toluene with a good sensitivity. A fiber-coupled deep UV-LED was employed as a light source, and a spectrometer was used as a detector with a gas cell in between. 3D printed opto-fluidics connectors were designed to integrate the gas flow with UV light. Two types of hollow core waveguides (HCW) were tested as gas cells: a glass capillary tube with aluminum-coated inner walls and an aluminum capillary tube. The setup was tested for different toluene concentrations (10â 100 ppm), and a linear relationship was observed with sensitivities of 0.20 mA U/ppm and 0.32 mA U/ppm for the glass and aluminum HCWs, respectively. The corresponding limits of detection were found to be 8.1 ppm and 12.4 ppm, respectively
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Description
peer-reviewed
Publisher
MDPI
Citation
Collections
Bernal Institute
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Khan_2019_Development.pdf
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Keywords
ultraviolet light-emitting diode (UV LED), spectrophotometry, UV absorption, gas sensors, Benzene, toluene, ethylbenzene and xylene (BTEX), hollow core waveguides, capillary tubes
ULRR Identifiers
https://hdl.handle.net/10344/7730
 https://doi.org/10.34961/4745
Funding code
Funding Information
European Research Council (ERC)
Sustainable Development Goals
Type
Article
Rights
https://creativecommons.org/licenses/by-nc-sa/1.0/
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