Patent ID: 6263741
Filing Date: 2001-07-24
Classification: G01F

Abstract:
A micromechanically produced flow-restriction device comprising:a substrate;a first passage opening formed in a first main surface of a substrate;a channel which is formed in a second main surface of the substrate and one end of which is in fluid communication with said first passage opening;a second passage opening which is in fluid communication with a second end of the channel,said first passage opening, said channel and said second passage opening defining a flow path,a membrane which is formed in the substrate, which is arranged between the first and the second main surface of the substrate, and which is in fluid communication with said first passage opening;a membrane electrode formed at least on said membrane;a cover attached to the second main surface of the substrate in such a way that said cover defines together with said channel a flow resistance, said cover being provided with a counterelectrode which is arranged in opposed, spaced relationship with said membrane electrode in such a way that said membrane electrode and said counterelectrode define a capacitive pressure sensor, said capacitive pressure sensor being arranged on a wall of the flow path.