This paper describes a system for measuring the size and concentration of free air bubble nuclei in the limited ranges of size and concentration thought to exist in a water tunnel.
The system is based on measuring the amplitude attenuation of an acoustic pulse of sound as it is propagated across a water tunnel test section. An arbitrary method is proposed for converting the measured sound attenuation into size and concentration of air bubbles.
Killen, John M.; Ripken, John F..
A Water Tunnel Air Content Meter.
St. Anthony Falls Laboratory.
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