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Open AccessArticle

Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source

1
School of Engineering, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland
2
Université de Strasbourg, CNRS, ICPEES UMR 7515, F-67000 Strasbourg, France
3
In’Air Solutions, 67087 Strasbourg, France
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(3), 193; https://doi.org/10.3390/mi10030193
Received: 14 February 2019 / Revised: 8 March 2019 / Accepted: 11 March 2019 / Published: 18 March 2019
(This article belongs to the Special Issue Gas Flows in Microsystems)
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 (10–100 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. View Full-Text
Keywords: ultraviolet light-emitting diode (UV LED); spectrophotometry; UV absorption; gas sensors; Benzene, toluene, ethylbenzene and xylene (BTEX); toluene; hollow core waveguides; capillary tubes ultraviolet light-emitting diode (UV LED); spectrophotometry; UV absorption; gas sensors; Benzene, toluene, ethylbenzene and xylene (BTEX); toluene; hollow core waveguides; capillary tubes
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MDPI and ACS Style

Khan, S.; Newport, D.; Le Calvé, S. Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source. Micromachines 2019, 10, 193.

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