JEFFREY FOSTER PUCKETT
Pilots at County Rd 492, Rector, AR
License number
Arkansas A4190986
Issued Date
Sep 2016
Expiration Date
Sep 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
154 County Rd 492, Rector, AR 72461
Professional information
Method And Apparatus For Flow Measurement With Temperature And Density Compensation
US Patent:
6390999, May 21, 2002
Filed:
Jun 26, 1997
Appl. No.:
08/882948
Inventors:
John Zscheile - Rockledge FL
Jeffrey F. Puckett - Rector AR
Richard S. Eidens - Salt Lake City UT
Jeffrey F. Puckett - Rector AR
Richard S. Eidens - Salt Lake City UT
Assignee:
Rocky Mountain Research, Inc. - Salt Lake City UT
International Classification:
A61M 3700
US Classification:
604 401, 7386129
Abstract:
A transit time ultrasonic flow meter includes a pair of ultrasonic transducers transmitting an ultrasonic signal through a fluid flowing in a conduit and receiving the transmitted ultrasonic signal. An exclusive-OR (XOR) phase comparator then detects a difference in phase between the received ultrasonic signal and a reference signal having a selected phase shift (e. g. , 0°, 90°, 180°, or 270°) with respect to the transmitted ultrasonic signal. Control circuitry selects the phase shift of the reference signal based on outputs of the XOR phase comparator in order to maintain the phase shifts detected by the XOR phase comparator within a range in which the comparator has relatively accurate detection (e. g. , 45° to 135°). By adjusting the phase of the reference signal and thereby maintaining the XOR phase comparator in its relatively high accuracy region, the present invention enhances the accuracy of detection by the phase comparator.