Doppler ultrasound flow metering instrumentation for measuring the volume of a liquid that has transferred over a period of time using Doppler effect acoustic frequency shift ultrasound acoustic wave fluid flow velocity sensors.
The frequency and wavelength of an acoustic wave remains constant if the source and receiver are fixed relatively to each other, and the medium in which the wave propagates has not changed.
If the acoustic source is moving away from the receiver, then the wavelength will become stretched and the frequency lowered relative to the receiver.
Conversely, if the acoustic source is moving towards the receiver, then the wavelength will become compressed and the frequency raised relative to the receiver.
In the case of measuring flow, the doppler effect is applied by bouncing acoustic waves off particles and bubbles in the flowing fluid. Although the acoustic source is static relative to the receiver, it will become a moving one when it bounces off a moving particle or bubble.
A doppler flowmeter can be used to measure liquids such as waste water and other liquids which contain solid particles or gas bubbles.
Ultrasonic sensors are contactless measurement devices which transmit and receive high frequency acoustic waves to measure flow velocity of a fluid.
Since there is no contact with the fluid to be measured, ultrasound sensor technology can be used in applications where sensors requiring contact are otherwise prohibited. These sensors have no moving parts which makes them very reliable, requiring very little maintenance.
Ultrasonic sensors can be housed in a single assembly combining the acoustic transmitter and receiver in one device, or in dual assembly separating the acoustic transmitter and receiver.
A liquid volumetric flow meter is an instrument which can measure either directly or indirectly the volume of a fluid which is passing through a specific location in a set period of time.
Ultrasonic liquid volumetric flow meters actually measure the speed of the flow rather than directly measure the volumetric flow rate. The flow speed measurement is converted into a volumetric flow rate by multiplying the flow velocity by the cross-sectional area of the duct or pipe where the volumetric flow meter is installed, i.e. Q = v ยท A.
Ultrasonic liquid volumetric flow meters can provide an analogue, digital or pulse output of the volumetric flow rate.
A ultrasonic liquid volumetric flow meter may also include additional electronics such as a digital indicator for displaying the total volume measured to date.
Related Help Guides
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- Flow Measurement
Related Technical Terms
- Doppler Effect Flow Measurement
- Mass Flow Rate
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- Positive Displacement Flow Measurement
- Square Root Extraction
- Totalizer
- Transit Time Flow Measurement
- Turbine Rotor Sensor
- Ultrasonic Flow Velocity Sensors
- Volumetric Flow Rate
- Vortex Flow Measurement
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