Water Journal : Current November 2017
www.awa.asn.au 69 The results with various sensor designs showed that using a thinner coating takes less than 15 minutes to saturate while thicker coatings take nearly an hour for saturation. However, the sensitivity of the thicker coating is approximately more than 2.5 times that of the thinner coating. Depending on the application, it should therefore be possible to select the coating thickness to achieve faster response or higher sensitivity. Thinner coatings for rapid response are more suitable for this study. Furthermore, visual observations of the photonic sensors indicated that the aggressive and biofouling sewer conditions had only minor impact on the physical integrity of the photonic sensors after five months. This study demonstrated that photonic sensors can be used to monitor humidity in the range where hydrogen sulphide is converted into sulphuric acid. The use of photonic sensors in Sydney Water will both improve the monitoring of humidity and help optimise ventilation. It will also provide information for the design and management of future sewer systems. Dr Heriberto (Heri) Bustamante is principal scientist -- treatment at Sydney Water Dr Lourdes S M Alwis is a lecturer in electrical, electronic and information engineering at Edinburgh Napier University, Scotland. Professor Kenneth T. V. Grattan has been researching novel optical instrumentation at City, University of London. Professor Tong Sun is director of the Research Centre of Sensors and Instrumentation. Louisa Vorreiter is currently service planning lead in asset strategy with Sydney Water. José González has more than 28 years of experience and has conducted fieldwork and laboratory analyses ranging from trace organics to trace metals. To read the full article, visit the Water e-Journal at bit.ly/water_ejournal Photonic sensors can be used to monitor humidity in the range where hydrogen sulphide is converted into sulphuric acid.
Current August 2017