Patent ID: 7765874

Claim:
Vacuum measuring cell with a membrane ( 2 , 41 ) disposed between two planar housing parts ( 1 , 4 ), wherein the first housing part ( 1 ) forms a reference vacuum volume ( 10 ) and the second housing part ( 4 ) a measuring vacuum volume ( 9 ) with connection means ( 5 ) for the connection with the medium to be measured, and means for measuring the membrane deflection are provided, characterized in that the membrane surface ( 41 a ), which is exposed to the medium to be measured, is implemented as a structured surface, the structure of the structured surface being implemented such that an accumulation layer ( 40 ) deposited from the medium onto the membrane ( 2 , 41 ) behaves substantially stress-free with respect to the membrane, such that hereby a stress deformation of the membrane ( 2 , 41 ) is reduced.