A vortex shedding flowmeter uses two ultrasonic transducers to generate {HEAD ~ an acoustic beam} at {TAIL ~ a selected carrier frequency} 
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A vortex shedding flowmeter uses two ultrasonic transducers to generate { HEAD ~ an acoustic beam } at { TAIL ~ a selected carrier frequency }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL