Ultrasonic flow meter ( speed of sound )

Description

An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Ultrasonic flow meters are affected by the acoustic properties of the fluid Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and against the direction of the flow or by measuring the frequency shift from the Doppler effect. By using the absolute transit times both the averaged fluid velocity and the speed of sound can be calculated.

Related formulas

Variables

cThe speed of sound (m/s)
LThe distance between receiving and transmitting transducers (m)
tupThe transit time of ultrasonic pulses propagating against flow direction (s)
tdownThe transit time of ultrasonic pulses propagating into the direction of the flow (s)