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Title: Multipath Ultrasonic Flow Meters For Gas. Measurement
Author: Lars Farestvedt
Source: 2003 International School of Hydrocarbon Measurement
Year Published: 2003
Abstract: Transit time UltraSonic Meters (USM) have been used in gas measurement for close to two decades now, though ultrasonic technology in general has been used in flow measurement for several decades. Ultrasonic technology is defined as utilizing sound waves at higher frequencies than what the human ear can hear, so higher than 20,000 Hz (or 20kHz). Most natural gas USMs use frequencies around 100- 200 kHz, while liquid USMs are in the 1 GHz range. There is in other words differences in the optimum frequency to be used depending of the medium that is to be measured.

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