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Title: Fundamentals Of Multi-Path Ultrasonic Meters
Author: William R. Johansen
Source: 2005 Western Gas Measurement Short Course
Year Published: 2005
Abstract: The use of sound waves to measure fluid flow was conceived more than 40 years ago. The basic equation for measuring flow using sound waves will be discussed and derived. An understanding of velocity profiles is also important as the velocity profile of the gas flowing in a pipe will affect the accuracy of ultrasonic flow measurement. Most ultrasonic flowmeters in use today are flow calibrated. An understanding of how the ultrasonic meter is to be used in the field is essential in establishing calibration parameters. As a result of a flow calibration the ultrasonic meter is adjusted to bring it into agreement with the calibration facility. Three different methods of adjusting ultrasonic meter performance are currently in use. The three different adjustment methods will be discussed as well as the potential strengths and weaknesses of each.

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