Timed window ultrasonic gas meter with nose cone

US6606916B2 · kind B2 · utility

Assignee

• Commonwealth Scientific and Research Organisation · AU

Inventors

• Noel Bignell · Sydney, AU
• Colin Walter Braathen · Hornsby, AU
• Gerard Jan Jeep Berend DeGroot · Hornsby, AU
• Barry John Martin · Guildford, AU
• Charles Malcolm Welsh · Pine Hills Road, AU
• John Graeme Winter · Sydney, AU

Key dates

• Filing date: Dec 22, 2000
• Grant date: Aug 19, 2003
• Expiry date: May 10, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P5/245
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An ultrasonic fluid flow meter (50) measures the flow speed of a fluid by measuring the time, in each direction, for a sequence of ultrasonic pulses (55) to pass between two transducers (54A,54B) positioned in a measuring tube (52) in the fluid flow path. The second and subsequent transmit pulses of each sequence are caused to start by the arrival of its predecessor at the detector end of the measuring tube. A first transmit pulse calculates a delay (110) to a zero crossing which is used to identify a particular zero crossing at which the arrival of each pulse in the sequence is determined.