Device for testing a surface including an extraction unit for extracting a shifted frequency component and associated method

摘要

A device including a holder and a transmitter supported by the holder is provided. The transmitter is capable of transmitting an electromagnetic signal toward the surface any transmission frequency (Fe). The device also includes a receiver for receiving a signal reflected on the surface. The device also includes a guide assembly for guiding the movement of the holder to move the transmitter and the receiver across from the surface, tangentially relative to the surface. The device also includes an extraction unit for extracting, in the signal received by the receiver, a shifted frequency component of the transmission frequency resulting from a local impedance variation of the surface. The extraction unit produces an extracted signal representative of the state of the surface from the shifted frequency component.

主权项

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.