Although all ultrasonic flowmeters use sound wave signals, they do not operate in the same way.
Transit time vs. Doppler ultrasonic flow meter
There are two main types of clamp-on ultrasonic flowmeters: transit time flowmeters and Doppler flowmeters, which differ in the way they transmit, receive, and process sound wave signals.
Transit time flowmeters use a pair of transducers that act as both transmitters and receivers of sound wave signals.
The speed of sound waves in a fluid is faster as they travel downstream and slower as they travel upstream.
By measuring the time difference between these scenarios, the meter can calculate the fluid velocity and, subsequently, the volumetric flow rate. When combined with the known density of the fluid, the mass flow rate can also be determined.
Transit time ultrasonic flow meters are more versatile, capable of measuring both liquids and steam, but they generally only work with one type of fluid at a time.
They require liquids containing a minimum of solid particles or entrained bubbles to avoid interference with the sound wave signal.
methode-du-doppler-a-impulsions-schema-en
Doppler flow meters, on the other hand, measure the frequency shift of the sound signal, which is proportional to fluid velocity.
These flowmeters rely on the presence of solid particles or air bubbles in the flow stream to divert sound wave signals to the flowmeter.
As a result, Doppler meters are limited to liquids containing solid particles or air bubbles, such as dirty or aerated liquids and slurries.
Explore the different types of ultrasonic clamp-on flow meters
Although all ultrasonic flowmeters use sound wave signals, they do not operate in the same way.
Transit time vs. Doppler ultrasonic flow meter
There are two main types of clamp-on ultrasonic flowmeters: transit time flowmeters and Doppler flowmeters, which differ in the way they transmit, receive, and process sound wave signals.
Transit time flowmeters use a pair of transducers that act as both transmitters and receivers of sound wave signals.
The speed of sound waves in a fluid is faster as they travel downstream and slower as they travel upstream.
By measuring the time difference between these scenarios, the meter can calculate the fluid velocity and, subsequently, the volumetric flow rate. When combined with the known density of the fluid, the mass flow rate can also be determined.
Transit time ultrasonic flow meters are more versatile, capable of measuring both liquids and steam, but they generally only work with one type of fluid at a time.
They require liquids containing a minimum of solid particles or entrained bubbles to avoid interference with the sound wave signal.
methode-du-doppler-a-impulsions-schema-en
Doppler flow meters, on the other hand, measure the frequency shift of the sound signal, which is proportional to fluid velocity.
These flowmeters rely on the presence of solid particles or air bubbles in the flow stream to divert sound wave signals to the flowmeter.
As a result, Doppler meters are limited to liquids containing solid particles or air bubbles, such as dirty or aerated liquids and slurries.