Acoustic Flowmeter

This type of flowmeter (ultrasonic) can give a continuous measurement of the flow rates of both open channel or pipe. It is nonintrusive, nonmechanical and can give a reading in either flow direction.

There are two types used:

• Ultrasonic Doppler Meter
• Ultrasonic Transit-time Meter

 

Acoustic Flowmeter FORMULA
\(\large{ v_a = \frac {l} {2 \; \cos \; \theta} \left( \frac {1} {t_d} - \frac {1} {t_u} \right) }\)
Symbol	English	Metric
\(\large{ v_a }\) = average axial velocity of water flow	\(\large{ \frac{ft}{sec} }\)	\(\large{ \frac{m}{s} }\)
\(\large{ l }\) = acoustic path length between transducer faces	\(\large{ ft }\)	\(\large{ m }\)
\(\large{ t_d }\) = acoustic signal downstream travel time	\(\large{ sec }\)	\(\large{ s }\)
\(\large{ t_u }\) = acoustic signal upstream travel time	\(\large{ sec }\)	\(\large{ s }\)
\(\large{ \theta }\) = angle between acoustic path and the pipe's longitudinal axis	\(\large{ deg }\)	\(\large{ rad }\)

 

Acoustic Flowmeter calculator