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A low-cost autonomous optical sensor for water quality monitoring

Authors: 

Kevin Murphy, Brendan Heery, Timothy Sullivan, Dian Zhang, Lizandra Paludetti, King Lau, Dermot Diamond, Emane Costa, Noel O'Connor

Publication Type: 
Refereed Original Article
Abstract: 
A low-cost optical sensor for monitoring the aquatic environment is presented, with the construction and design described in detail. The autonomous optical sensor is devised to be environmentally robust, easily deployable and simple to operate. It consists of a multi-wavelength light source with two photodiode detectors capable of measuring the transmission and side-scattering of the light in the detector head. This enables the sensor to give qualitative data on the changes in the optical opacity of the water. Laboratory tests to confirm colour and turbidity-related responses are described and the results given. The autonomous sensor underwent field deployments in an estuarine environment, and the results presented here show the sensors capacity to detect changes in opacity and colour relating to potential pollution events. The application of this low-cost optical sensor is in the area of environmental pollution alerts to support a water monitoring programme, where multiple such sensors could be deployed as part of a network.
Digital Object Identifer (DOI): 
10.1016/j.talanta.2014.09.045
Publication Status: 
Published
Date Accepted for Publication: 
Thursday, 15 January, 2015
Publication Date: 
15/01/2015
Journal: 
Talanta
Volume: 
132
Pages: 
520-527
Research Group: 
Institution: 
Dublin City University (DCU)
Open access repository: 
No