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Ultra low cost LED based gas sensing

Orpen, Dylan and Fay, Cormac and Beirne, Stephen and O'Toole, Martina and Lau, King-Tong and Corcoran, Brian and Diamond, Dermot (2011) Ultra low cost LED based gas sensing. In: Photonics Ireland 2011 , 7-9 Sept 2011, The Grand Hotel, Malahide, Dublin..

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Abstract

Over the last number of years a movement has taken place where conventional point-to-point grab sampling style sensors have slowly been phased out in favor of in situ autonomous sensors. Autonomous sensors provide a better insight into the monitored parameter delivering more data points in a less manual fashion. Over the next ten years, it’s predicted that gas sensors will become smaller, consume less power and exhibit much improved performance, and be of substantially reduced cost [1]. Optical sensors certainly are in pole position in terms of development having already met many of the criteria. The authors present a low cost (< €1) sensing platform. Two L.E.D’s are setup as a light sensor (emitter,detector), where the light passing from the emitter to detector L.E.D is modulated by a chemically selective colorimetric film, providing an indirect chemical measurement (this sensing setup is visible in Figure 1). Our presented experimental setup has exhibited a limit of detection in the p.p.b region (0.001145 mg/L or 12 ppb) [2], as well as demonstrating a 95% recovery within 30 seconds of contaminant exposure [2] (example exposures visible in Figure 2). This work has been done utilizing a bromophenol blue based dye, which was inkjet printed to created reproducible optical pH sensitive slides. However, the target of the device can be tuned by varying the colorimetric coating composition.

Item Type:Conference or Workshop Item (Poster)
Event Type:Conference
Refereed:No
Uncontrolled Keywords:gas sensors; Light Emitting Diodes; LED
Subjects:Physical Sciences > Thin films
Physical Sciences > Photonics
Engineering > Environmental engineering
DCU Faculties and Centres:Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland
ID Code:16490
Deposited On:07 Oct 2011 14:24 by INVALID USER. Last Modified 07 Oct 2011 14:24

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