Patent ID: 8402836

Claim:
A pressure difference measuring cell for registering pressure difference between a first pressure and a second pressure, comprising: an elastic measuring arrangement having at least one measuring membrane, or diaphragm, comprising silicon; a platform pressure-tightly connected with said elastic measuring arrangement; a first hydraulic path for transferring a first pressure onto a first surface section of said elastic measuring arrangement; a second hydraulic path for transferring a second pressure onto a second surface section of said elastic measuring arrangement, and; at least one hydraulic throttle wherein: the first pressure opposes the second pressure; the elastic deflection of said measuring arrangement is a measure for the difference between the first and the second pressure; said at least one hydraulic throttle comprises porous silicon; said elastic measuring arrangement has a measuring membrane, or diaphragm, which is arranged between a first platform part and a second platform part of said platform, and is pressure-tightly connected with both said platform parts, in each case, along a perimetral joint; said first and said second hydraulic paths comprise, in each case, at least one duct through one of said platform parts; and said at least one hydraulic throttle includes a porous Si layer, which surrounds a duct opening on a surface of one of said platform parts facing away from said measuring membrane, or diaphragm, and a hydraulically sealed cover layer, which covers said porous Si layer up to at least one intake opening, which is laterally spaced from said duct opening, so that one of said hydraulic paths extends from at least one intake opening through said porous Si layer in the plane of said porous Si layer to the duct opening.