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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28497

Title: A Compact Optical Instrument with Artificial Neural Network for pH Determination
Authors: Capel Cuevas, Sonia
López-Ruiz, Nuria
Martínez Olmos, Antonio
Cuéllar, Manuel P.
Pegalajar Jiménez, María del Carmen
Palma López, Alberto José
Orbe Payá, Ignacio de
Capitán Vallvey, Luis Fermín
Issue Date: 2012
Abstract: The aim of this work was the determination of pH with a sensor array-based optical portable instrument. This sensor array consists of eleven membranes with selective colour changes at different pH intervals. The method for the pH calculation is based on the implementation of artificial neural networks that use the responses of the membranes to generate a final pH value. A multi-objective algorithm was used to select the minimum number of sensing elements required to achieve an accurate pH determination from the neural network, and also to minimise the network size. This helps to minimise instrument and array development costs and save on microprocessor energy consumption. A set of artificial neural networks that fulfils these requirements is proposed using different combinations of the membranes in the sensor array, and is evaluated in terms of accuracy and reliability. In the end, the network including the response of the eleven membranes in the sensor was selected for validation in the instrument prototype because of its high accuracy. The performance of the instrument was evaluated by measuring the pH of a large set of real samples, showing that high precision can be obtained in the full range.
Sponsorship: We acknowledge financial support from the Ministerio de Ciencia e Innovación, Dirección General de Investigación y Gestión del Plan Nacional de I+D+i (Spain) (Projects CTQ2009-14428-C02-01 and CTQ2009-14428-C02-02); and the Junta de Andalucía (Proyecto de Excelencia P08-FQM-3535). These projects were partially supported by European Regional Development Funds (ERDF).
Publisher: MDPI
Keywords: Portable instrument
H coordinate
HSV colour space
pH sensor array
Neural networks
URI: http://hdl.handle.net/10481/28497
ISSN: 1424-8220
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Capel-Cuevas, S.; et al. A Compact Optical Instrument with Artificial Neural Network for pH Determination. Sensors, 12(5): 6746-6763 (2012). [http://hdl.handle.net/10481/28497]
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