Draw and explain Doppler type flow measurement.

Draw and explain Doppler type flow measurement.
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1 Answer

Answer :

Doppler type ultrasonic flow meter

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➢ Explianation: • The Doppler Effect Ultrasonic Flow meter use reflected ultrasonic waves to measure the fluid velocity. • There is a change in ultrasonic frequency ( Fc ± Δf ) received by the ultrasonic receiver as the ultrasonic wave is travelling through the fluid flowing. This change or shift in the ultrasonic frequency is called as doppler frequency. • The resulting frequency shift is named the Doppler Effect. • The fluid for which pipe flow rate is being measured must have material like particles or air bubbles that will reflect ultrasonic waves • A signal of known ultrasonic frequency is transmitted through fluid, which has uniform velocity (v). • Solids, bubbles or any discontinuity in liquid will reflect back to the receiver Because of the velocity of the liquid their frequency, there will be a frequency shift at the receiver end which is protentional to the velocity

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