Pressure transducer dome

DETAILED DESCRIPTION With this and other objects in view the present invention contemplates fluid pressure measuring apparatus having a housing with first and second chamber portions separated by a flexible member.
The second chamber houses a device for positioning against the bottom surface of the flexible member to detect movement of the member in response to pressure pulses entering the upper chamber.
The first chamber is formed by a cavity formed in a generally dome shaped cover portion which is arranged over the flexible member.
The cavity serves as a fluid accumulator to provide a confined volume of fluid over the flexible member and thereby transmit pressure changes, incoming to the cavity, to the flexible member.
The cavity is arranged to be asymmetrical to reduce the occurrence of standing waves.
One asymmetrical feature of the cavity is the non-parallel interior side wall portions.
Another asymmetrical feature of the cavity is a sloping upper interior face of the cavity.
Still another feature of the cavity is a convex, downwardly-depending surface toward the center of the upper interior face of the cavity, acting as a fluid flow dispersing means.
Still another feature of the dome cover is the arrangement of ports or passage entrances into and out of the cavity, wherein such ports, usually a pair, are arranged on substantially opposite sides of the upper interior of the cavity and are sized to provide a closer impedance match between the ports, with their connecting fluid flow tubes, and the cavity itself.