Application of ultrasonic method for investigation of porous plates

Abstract

Application of ultrasonic method for evaluating porous plates is presented in this article, The ultrasonic echolocation measurement method to evaluate porous structures is presented. The mathematical model is considered for uniform and non-uniform volume structure of the product. The pores on the surface are smaller then in the depth of a flat surface. The indirect ultrasonic measurement method is proposed for investigation of porous plates. The porosity of a product is evaluated by absorbed liquid volume versus time using this method. The volume of the absorbed liquid is calculated according to the liquid level in the cylindrical measurement vessel versus time. The level of liquid is measured by acoustical echolocation method through air. The measurement vessel construction was improved for planar objects. The obtained uncertainty in distance measurements till the liquid surface is five micrometers in the forty millimeters measurement interval. The focusing electroacoustical transducers were used for investigations.
The experimentally tested technique allows to apply acoustic method for various porous plates structures investigations when others methods give results with great uncertainties. This article can be beneficial for researchers, who specialize in evaluation of porous structures.