Vergaz Benito, RicardoSánchez Pena, José ManuelBarrios Puerto, DavidVázquez García, María CarmenContreras Lallana, Pedro2009-04-222009-04-222008Solar energy materials & solar cells, nº92, p.1483-1487, 5 August 2008.0927-0248http://hdl.handle.net/10016/4032Some smart windows make use of suspended particle devices (SPDs) which are made of charged rod-shape particles that change their orientation in an applied electric field, thereby allowing transmittance control. In this work, the electro-optical behaviour of a commercial SPD is analyzed. Impedance analysis shows characteristics similar to those of a Randles circuit, and a modified equivalent circuit is proposed and experimentally validated. Intermediate levels of transmittance are obtained using a customized field programmable gate array (FPGA)-based electrical circuit. Finally, measurements are taken to check the applicability of the SPD device and control system in smart glazing or photonic applications.application/pdfengControl systemEquivalent circuitImpedanceMeasurementTransmittanceElectric fieldOrientationCharged particleWindowsSuspended particleModelingconference outputElectrónicaopen access