Patent ID: 7690243

Claim:
A measurement probe for an apparatus for measurement of the thickness of thin layers, the measurement probe having a housing which holds at least one sensor element whose longitudinal axis lies on a longitudinal axis of the housing, a supply opening to which a connection for supplying a gaseous medium is fitted, and which has an outlet opening which is provided on an end face of the measurement probe, pointing towards a measurement surface, and having a connection channel, which connects the supply opening to the outlet opening, wherein the outlet opening is provided on the longitudinal axis of the housing, and the sensor element is arranged concentrically with respect to the outlet opening, and the outlet opening is provided on a cup-shaped projection on said one end face of the sensor element, thus resulting in the distance between the measurement probe and the measurement surface being increased adjacent to the outlet opening, so that a vacuum-pressure area is created adjacent to the outlet opening, and that a supporting ring which extends in the radial direction is provided on the housing and has a plurality of outlet openings which point towards the measurement surface.