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US 4,300,400 AGranted
Acoustic flowmeter with Reynolds number compensation
AssigneeWestinghouse Electric Corp.
InventorsJohn M. Bistrian, Jr., Lawrence G. Wright
Life of this patent
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Abstract
An acoustic flowmeter wherein pulses of acoustic energy are transmitted between upstream and downstream transducers through the fluid under measurement and wherein the arithmetic computation of velocity based upon the difference in time measurement of the oppositely-directed pulses is modified by predetermined factors to automatically compensate for errors caused by a Reynolds number change due to flow velocity change.
Claims8
Acoustic flowmeter apparatus for measuring fluid flow in a conveyance, said fluid being subject to a varying Reynolds number, comprising:
- (a) means for projecting acoustic energy through said fluid from respective upstream and downstream transducers, the relative upstream and downstream travel times of said projected acoustic energy being indicative of the velocity of said fluid;
- (b) means for obtaining an indication of said fluid velocity based upon said travel times;
- (c) arithmetic means for raising said indication to a predetermined power other than one and thereafter modifying by a predetermined constant value.
Dependencies are inferred from the claim text.