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An instrument for determining the velocity of a fluid flow from the difference between the times required for high-frequency sound to travel between two transducers in opposite directions along a path having a component parallel to the flow.



Related Terms

CORRELATION ULTRASONIC FLOWMETER

An instrument for determining the velocity of a fluid flow from the time required for discontinuities in the fluid stream to pass between two pairs of transducers that generate and detect highfrequency sound.

DIFFERENTIAL-PRODUCING PRIMARY DEVICE

An instrument that modifies the flow pattern of a fluid passing through a pipe, duct, or open channel, and thereby produces a difference in pressure between two points, which can then be measured to determine the rate of flow.

LONGITUDINAL BAFFLE

Baffle sheets or plates within a process vessel (such as a heat exchanger) that are parallel to the long dimension of the vessel; used to direct fluid flow in the desired flow pattern.

CROSSBAR MICROMETER

An instrument consisting of two bars mounted perpendicular to each other in the focal plane of a telescope, and inclined to the east-west path of stars by 45 ; used to measure differences in right ascension and declination of celestial objects.

ANEMOMETER

An instrument for measuring the velocity of a fluid.

DIFFERENTIAL SCREW

A type of compound screw which produces a motion equal to the difference in motion between the two component screws.

DIFFERENTIAL INSTRUMENT

Galvanometer or other measuring instrument having two circuits or coils, usually identical, through which currents flow in opposite directions; the difference or differential effect of these currents actuates the indicating pointer.

INTEGRATING ACCELEROMETER

An instrument which senses the component of specific acceleration along an axis known as the sensitive axis of the accelerometer, and produces an output equal to the time integral of that quantity. Also called VELOCITY METER.

ACOUSTIC OCEAN-CURRENT METER

An instrument that measures current flow in rivers and oceans by transmitting acoustic pulses in opposite directions parallel to the flow and measuring the difference in pulse travel times between transmitter-receiver pairs.

DIFFERENTIAL MANOMETER

An instrument in which the difference in pressure between two sources is determined from the vertical distance between the surfaces of a liquid in two legs of an erect or inverted U-shaped tube when each of the legs is connected to one of the sources.

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