Tracking control system using an incident radiation angle microsensor
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For some industrial applications, an accurate estimation of a light source position is needed. That is the case for a heliostat, a device that projects sunlight onto a focus hundreds of meters away from its aiming point. In this paper, we present a novel sensor design for generating an alignment error signal. Included is a detailed study of its response, which shows that certain geometrical design parameters are necessary to achieve desired accuracy. This sensor has been implemented using microelectromechanical system techniques to achieve a robust structure at low cost and it has been successfully applied to sun-tracking systems. Experimental results obtained in field tests are included.
CitacióQuero, J.M.; Aracil, C.; Franquelo, L.G.; Ricart, J.; Ortega, P.R.; Domínguez, M.; Castañer, L.M.; Osuna, R. Tracking control system using an incident radiation angle microsensor. A: IEEE Transactions on Industrial Electronics, 2007, vol. 54, p.1207-1216.