Medida de la no línealídad en materiales piezocerámicos por el método de la intermodulación

A method of measurement of the nonlinearity of piezoelectric ceramic materials near a resonance has been described. It is based upon intermodulation distortion IMD of two signals of different frequency. Since relatively low excitation signals can be used, higher frequencies can be attained. Suitable magnitudes have been defined in order to analyze the results, and the data treatement has been discussed, verifying that the results are not only self coherent, but coherent with other measurement methods. The present method has been applied to a set of diferent piezoceramic materials, comparing their properties.