THE ROLE OF POLARIZATION OF THE SURFACE IN GENERATING ELECTROMAGNETIC IMPULSE RESPONSE OF THE MECHANICAL EXCITATION OF DIELECTRIC MATERIALS
In the article the results of experimental studies of the electromagnetic response to the shock excitation of the samples of cement and gypsum stone. Investigated the temporal and amplitude-frequency characteristics of electromagnetic responses using two kinds of electrical receivers: contact and contactless. As the electrical contact of the receiver used a metal foil on the knurled surface of the sample. As a contactless receiver used a metal plate, located at a distance of 2 mm from the sample surface. Studies have shown that a significant role in the generation of the electromagnetic response of the registered non-contact method, plays a component associated with acoustic vibrations induced surface charges. The contribution of polarization effects in the electromagnetic response is determined by the dielectric and acoustic properties of the materials.