Patent ID: 8214168
Filing Date: 2012-07-03
Classification: G01F,G01N

Abstract:
1. A method of passing a measuring signal through a test material located between at least two spaced walls, the method comprising: (a) at least one of emitting and receiving the measuring signal from at least one transducer; (b) passing the measuring signal associated with the at least one transducer along a first signal path and a second signal path through the test material and the at least two spaced walls, the first and the second signal paths having equal or known external components and the first and the second signal paths having different straight lengths within the test material; and (c) measuring at least one signal parameter of the measuring signal passed along the first signal path and the second signal path, wherein the at least one signal parameter of the measuring signal is changed by the passing of the measuring signal through the test material.