Patent ID: 6820482
Filing Date: 2004-11-23
Classification: G01F,G01P

Abstract:
A method for gas flow determination, comprising:providing a sensor device including a diaphragm and a frame enclosing the diaphragm; creating a predetermined temperature profile on the diaphragm; directing a gas flow to be determined over the diaphragm in a predetermined direction of a flow; measuring a change in a temperature profile caused by the gas flow; determining the gas flow on the basis of the change in the temperature profile caused by the gas flow; and performing one of: regulating a temperature at a third location on the diaphragm upstream from a first location to a value corresponding to a local value of the predetermined temperature profile, the first location being located on the diaphragm upstream from a central region of the diaphragm, and regulating a temperature at a fourth location downstream from a second location on the diaphragm to the value corresponding to the local value of the predetermined temperature profile, the second location being located on the diaphragm downstream from the central region of the diaphragm.