Patent Number: 6,169,965

Title: Fluid property and flow sensing via a common frequency generator and FFT

Abstract: A method and apparatus for using a common frequency generator for measuring selected properties of a fluid of interest via one or more heater and/or sensor elements. The common frequency generator may sequentially and/or simultaneously provide input signals to selected heater and/or sensor elements. Application of more than one frequency component by the common frequency generator enables the determination of one or more time and/or phase lags more efficiently, especially when using an FFT analysis technique. From the time and/or phase lags, the selected fluid properties including fluid flow speed can be determined.

Inventors: Kubisiak; David (Chanhassen, MN), Bonne; Ulrich (Hopkins, MN)

Assignee: Honeywell International Inc.

International Classification: G01N 27/14 (20060101); G01F 1/684 (20060101); G01F 1/698 (20060101); G01F 1/696 (20060101); G01F 1/704 (20060101); G01F 1/708 (20060101); G01F 1/712 (20060101); G01N 27/18 (20060101); G01F 5/00 (20060101); G01N 25/18 (20060101); G01N 025/00 (); G01K 017/06 (); G06I 015/20 ()

Expiration Date: 01/02/2018