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The optimisation of a paired emitter-detector diode optical pH sensing device

Orpen, Dylan and Beirne, Stephen and Fay, Cormac and Lau, King-Tong and Corcoran, Brian and Diamond, Dermot (2010) The optimisation of a paired emitter-detector diode optical pH sensing device. Sensors and Actuators B: Chemical, 153 (1). pp. 182-187. ISSN 0925-4005

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Abstract

With recent improvements in wireless sensor network hardware there has been a concurrent push to develop sensors that are suitable in terms of price and performance. In this paper a low cost gas sensor is detailed, and significant improvements in sensor characteristics have been achieved compared to previously published results. A chemical sensor is presented based on the use of low cost LEDs as both the light source and photodetector, coupled with a sensor slide coated with a pH sensitive colorimetric dye to create a simple gas sensor. Similar setups have been successfully used to detect both acetic acid and ammonia. The goal of this work was to optimise the system performance by integration of the sensing technique into a purposely deigned flowcell platform that holds the colorimetric slide and optical detector in position. The reproducibility of the sensor has been improved through this arrangement and careful control of deposited film thickness. The enhanced reproducibility between sensors opens the potential of calibration-free measurement, in that calibration of one sensor can be used to model the characteristics of all sensors in a particular batch.

Item Type:Article (Published)
Refereed:Yes
Subjects:Engineering > Mechanical engineering
Physical Sciences > Chemical detectors
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.snb.2010.10.007
Copyright Information:Copyright © 2010 Elsevier B.V.
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:15900
Deposited On:29 Nov 2010 14:31 by Cormac Fay. Last Modified 19 May 2011 12:09

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