| 摘要 |
<p>#CMT# #/CMT# The apparatus (10) has a transmitter (22) carried by a support (20) and emitting an electromagnetic signal along direction of a surface (12) with transmission frequency. A guidance assembly (21) guides the support to move the transmitter and a receiver (26) relative to the surface in a tangential manner. An extraction unit (34) extracts a frequential component shifted from the transmission frequency due to a change of local impedance of the surface. The extraction unit produces an extracted signal representative of a state of the surface from the shifted frequential component. #CMT# : #/CMT# An independent claim is also included for a method for controlling a surface. #CMT#USE : #/CMT# Apparatus i.e. portable unit, for controlling local heterogeneities and/or radioelectric defects present on a surface e.g. radio-electrically homogeneous surface such as conducting surface and metal surface, and insulating surface, formed in mass of a part e.g. parabolic reflector used in an antenna, or radome mounted on a fixed installation or a mobile platform such as aircraft. #CMT#ADVANTAGE : #/CMT# The apparatus ensures effective measurement of defects of radioelectric properties using an oscillator with very low noise of phase such as dielectric resonator oscillator, thus guaranteeing adequate sensitivity even if displacements are weak and low speed, and hence generating Doppler frequencies of few Hz in a simple manner. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic partial sectional view of a testing device intended to control a surface. 10 : Control apparatus 12 : Surface 20 : Support 21 : Guidance assembly 22 : Transmitter 26 : Receiver 34 : Extraction unit.</p> |
