Integral differential and static pressure transducer

Details Integral differential and static pressure transducer Integral differential and static pressure transducer

G - Physics

01

L

73/3, 73/67

G01L 9/06 (2006.01) G01L 9/00 (2006.01) G01L 19/00 (2006.01)

Patent

CA 1234299

INTEGRAL DIFFERENTIAL AND STATIC PRESSURE TRANSDUCER ABSTRACT OF THE DISCLOSURE Differential and static pressure transducers are pro- vided with piezoresistive elements connected in Wheatstone bridges on the 100 surface of a silicon chip over a dia- phragm etched into the chip from the back. A thin disk diaphragm is used for differential pressure (DP) and a thicker annular diaphragm around the disk diaphragm is used for static pressure (SP) measurements. Two of the elements opposite each other in each bridge are produced along one crystallographic direction (110), and the other two are produced along an orthogonal crystallographic direction (110). Extra elements are produced for each pair to permit selection of a more closely matched set of four elements. A plurality of DP diaphragms with different diameters and respective bridges are provided along with a multiplexer for selecting a DP bridge in order to provide different ranges of sensitivity for the differential pressure measurements.

485077

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