Patent ID: 9151720
Filing Date: 2015-10-06
Classification: G01N,G01R

Abstract:
1. A device for testing a surface, comprising: a holder; a transmitter supported by the holder, the transmitter being able to transmit an electromagnetic signal to the surface at a transmission frequency (Fe); a receiver for receiving a signal reflected on the surface; and a guide assembly for the holder to move the transmitter and the receiver across from the surface, tangentially relative to the surface, the device comprising an extraction unit for extracting a shifted frequency component (Fr-Fe) of the transmission frequency (Fe) resulting from a local impedance variation of the surface in the signal received by the receiver, the extraction unit producing an extracted signal that is representative of a state of the surface from the shifted frequency component, wherein the guide assembly comprises at least one skid and/or a rolling member capable of keeping the transmitter and the receiver at a substantially constant distance across from the surface, during the tangential movement of the holder on the surface.