Sounding Out the Applications for Ultrasonic Flow Measurement

Sensors Technology

Sounding Out the Applications for Ultrasonic Flow Measurement

Sounding Out the Applications for Ultrasonic Flow Measurement

Ultrasonic flow Measurement is based on the principle of transmitting and receiving sound

waves, so that which have a unique quality to jump from most objects: solid, liquid, or gaseous.

This technology is very different from traditional flow measurement technologies that use

turbines or thermal sensors to measure the flow of liquids.


Industry demands for higher accuracy and lower costs have led to the development of ultrasonic measurement technologies so that meet the requirements of a wide range of applications and

processes. While there are many different technologies in ultrasonic measurement on the

market today, these can be classified into four types. so that This cataloging is center on the attitude

on which these machines are construct.

Transit time technology

This is the original ultrasonic technology develop to measure fluid flow. so that The technology

uses the transit time of sound waves to measure speed. An ultrasonic flow tempo created

on this know-how has two ultrasonic transducers. These transducers act as transmitters and

receivers of ultrasonic waves. To measure the flow rate or velocity of the liquid, either gas or

liquid through the tube, the flow meter switches between emitting and receiving ultrasonic

waves through the transducers. so that The time it takes for sound waves to travel from the transmitting transducer to the receiver gives an accurate reading of the velocity of the liquid in the tube.


Ultrasonic Doppler Technology

This technology also works with two ultrasonic sound transducers. However, unlike transit

time technology, Doppler uses a transducer as a continuous transmitter of ultrasonic sound

waves. The second transducer acts as a continuous receiver. Sound waves introduced into the

stream are reflect or scattered from particles or bubbles suspend in the liquid and are

captured by the receiving transducer.

so that The reflection causes a change in frequency in the sound waves, which is known as the Doppler

Effect. By measuring this change in frequency, so it is possible to determine the flow rate of the

liquid in the tube. This velocity, calculated from the cross-sectional area of ​​the pipe, gives the

flow rate of the pipe stream.


Cross-correlation measurement technology

Cross-correlation measurement technology works on the principle that a turbulent flow of a

liquid is made up of vortices so that have nearly uniform properties over a small cross-section of

the flow. This is known as the correlation length. so that A flow meter based on cross-correlation

measurement technology has two ultrasonic sensors located along the flow direction of the liquid.


The first or upstream sensor captures the turbulence signature L / V seconds before the

second or downstream sensor, where L is the distance between the two sensors and V is

the velocity of the liquid flow. Therefore, the velocity turns out to be L / T, where T is the

time delay in detection between the two sensors.

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