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Title: Ultrasonic Meters Fo R Liquid Measurement
Author: Peter Kucmas
Source: 2015 International School of Hydrocarbon Measurement
Year Published: 2015
Abstract: Doppler and Transit-time flow meters are both linear velo city measurement devices that utilize the properties of ultrasound as the physical basis for their measurement. Frequency is the only difference between sound and ultras ounds physical phenomenon described in Hz or cycles per second. Sound is a mechanical pressure wave propagat ing or moving through a medium whether its liquid, gas, solid or plasma. Sound is typically defined by the range of human hearing which extends idealistically from 20 Hz (20 cycles per second) to 20,000 Hz (20,000 cy cles per second). Any sound above 20,000 Hz is thus considered ultrasound. As a point of contrast, s ound generated containing frequencies lower than 20 Hz is identified as subsonic, and as an ex ample used by large mammals like elephants to communicate over vast distances. Sound cannot propagate in vacuum

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