Study on Characteristic of Thin layer Rubber Based on Ultrasonic Echo Testing

摘要

With ultrasonic echo method, characteristic of rubber thin layer was investigated, and theory of a survey the thin layer medium characteristic of frequency spectral analysis was deduced. A method is proposed to establish restoration function of frequency spectrum ratio of ultrasonic echoes under the condition of substrate material is covered and uncovered with the rubber thin layer. The results show that ( ) H f contains information on the acoustic properties of the substrate and the thin layer, not only the supersonic wave propagation velocity in the rubber thin layer can be acquired, but also its acoustic impedance and density. The results of this method accord with the time frequency compound method, of which ascertains performance of a thin layer without damaging its usability of a detected component.