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Title: FUNDAMENTALS OF ULTRASONIC FLOWMETERS FOR NATURAL GAS
Author: JONATHAN FIEDLER
Source: 2018 American School of Gas Measurement Technology
Year Published: 2018
Abstract: The use of ultrasound in flow measurement began in the last century when, in 1928, Oskar Rtten patented this method and apparatus for measuring the volume of flowing liquids, gas, and steam. The first ultrasonic flowmeters were introduced in the 1950s, and in the 1960s different companies developed the first ultrasonic flowmeters using the differential transit time method. Around this same time the first clamp-on ultrasonic flowmeters were also launched onto the market. The first multipath ultrasonic flowmeters for measuring gases were finally introduced at the start of the 1980s. However the main breakthrough in ultrasonic flow measurement has come in the last 10 to 20 years, which has seen the breakthrough of digital signal processing. With this highly precise method, exact recording and analysis of transit times has become increasingly accurate, which of course has made the measuring device extremely interesting to industry.

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