A Neural Network Based Intelligent Predictive Sensor for Cloudiness, Solar Radiation and Air Temperature
AbstractAccurate measurements of global solar radiation and atmospheric temperature,as well as the availability of the predictions of their evolution over time, are importantfor different areas of applications, such as agriculture, renewable energy and energymanagement, or thermal comfort in buildings. For this reason, an intelligent, light-weightand portable sensor was developed, using artificial neural network models as the time-seriespredictor mechanisms. These have been identified with the aid of a procedure based on themulti-objective genetic algorithm. As cloudiness is the most significant factor affecting thesolar radiation reaching a particular location on the Earth surface, it has great impact on theperformance of predictive solar radiation models for that location. This work also representsone step towards the improvement of such models by using ground-to-sky hemisphericalcolour digital images as a means to estimate cloudiness by the fraction of visible skycorresponding to clouds and to clear sky. The implementation of predictive models inthe prototype has been validated and the system is able to function reliably, providingmeasurements and four-hour forecasts of cloudiness, solar radiation and air temperature.
The authors would like to correct the acknowledgements of this article  as follows:
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Ferreira, P.M.; Gomes, J.M.; Martins, I.A.C.; Ruano, A.E. A Neural Network Based Intelligent Predictive Sensor for Cloudiness, Solar Radiation and Air Temperature. Sensors 2012, 12, 15750-15777.
Ferreira PM, Gomes JM, Martins IAC, Ruano AE. A Neural Network Based Intelligent Predictive Sensor for Cloudiness, Solar Radiation and Air Temperature. Sensors. 2012; 12(11):15750-15777.Chicago/Turabian Style
Ferreira, Pedro M.; Gomes, João M.; Martins, Igor A.C.; Ruano, António E. 2012. "A Neural Network Based Intelligent Predictive Sensor for Cloudiness, Solar Radiation and Air Temperature." Sensors 12, no. 11: 15750-15777.