Ultrasonic meters work using the transit time differential method. Differential measurement of transmission time is based on a simple physical fact. Imagine two boats crossing a river on the same diagonal line, one upstream and the other upstream. Streaming boats take much less time to reach the opposite shore
Ultrasonic Flow Meters
Ultrasonic waves behave in exactly the same way. The sound wave that travels in the direction of the product stream is propagated at a speed greater than one trip against the current (vAB> vBA). TAB and TBA transit times are measured continuously. The difference (tBA – tAB) in the time traveled by the two ultrasonic waves is directly proportional to the average flow velocity (vm). Where,
tAB is the time it takes for ultrasound waves to pass through sensor A to B.
tBA is the time it takes for ultrasound waves to pass from sensor B to sensor
Pros and Cons of Ultrasonic Flow Meters
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