Gerhard H Felten

US Patent:

52070891, May 4, 1993

Filed:

Jul 11, 1991

Appl. No.:

7/720841

Inventors:

Jurgen Abt - Gerlingen, DE
Sybille Stumpf - Markgroningen, DE
Ulrich Kuhn - Renningen-Malmsheim, DE
Werner Banzhaf - Sindelfingen, DE
Gerhard Felten - Summerville SC
Gerold Lemperle - Leinfelden, DE
Michael Specker - Blaichach, DE

Assignee:

Robert Bosch GmbH - Stuttgart

International Classification:

G01B 13008

US Classification:

73 375

Abstract:

The method for measuring the cross-sectional area of a nozzle by a pneumatic through-flow method with supercritical pressure ratio measures the volume flow flowing through the nozzle on its input side by a differential pressure measurement at a resistance distance through which a laminar flow passes. Deviations of the temperature of the test medium from a reference value are determined by a temperature sensor and accounted for via a correction factor.