| In touch sensitive applications, the possibility of using the dispersive properties of a plate of specific material with specified dimensions to localize the source tap location is analyzed. Flexural waves propagating as a result of a tap on the material's surface by a finger, plastic or metal object are detected and the relevant dispersion information is extracted to determine the distance. Since the source signal parameters cannot be expected to be the same on a tap to tap basis, two methods independent of the excitation source are developed. Experimental results are presented to demonstrate repeatability, accuracy and independence of the developed methods in various source signal parameters. Additional impairments and strengths of the method are mentioned and briefly discussed. |
