Method and apparatus for measuring a pulsatingly fluctuating flow rate
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United States of America Patent
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May 24, 2016
Grant Date -
Jan 15, 2015
app pub date -
Jul 3, 2014
filing date -
Jul 12, 2013
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Abstract
A method and apparatus for measuring a pulsatingly fluctuating flow rate under a general condition, without needing electrical conductivity for a fluid, and without allowing a phase lag corresponding to a calculation time or attenuation, or resulting from a relation between pressure difference and flow rate, to occur. Ultrasonic waves are repeatedly transmitted with respect to a pulsatingly fluctuating fluid, while the ultrasonic wave is being received, and a signal indicative of the transmission and receipt, and a signal indicative of a timing of the transmission and receipt are recorded. Alternatively, the ultrasonic wave is transmitted and received based on a preliminarily set timing signal, and the signal indicative of the transmission and receipt is recorded. These signals are used to determine flow rates and transmission and receipt timings to plot a pulsating fluctuation. In one or more implementations, the timing signal may be phase-synchronized with a pulsation reference signal.
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