Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1998-09-17
2000-01-11
Fuller, Benjamin R.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386128, 7386118, G01F 166
Patent
active
060123389
ABSTRACT:
An ultrasonic flow velocity measuring apparatus includes two transducers arranged to form a certain angle to a flow velocity direction to measure flow velocity of a fluid, the two transducers transmitting and receiving an ultrasonic beam relative to each other to allow ultrasonic beam transmitting time to be measured to compute the flow velocity, wherein the transducers are connected to a transducer switching portion, which is connected to an outputting amplifier, which is connected to a frequency modulation oscillator, which is connected to a one shot multivibrator, which is connected to a control square pulse generating portion, which is connected to the transducer switching portion and an output switching portion, the outputting switching portion is connected to the receiving amplifier, the an attenuator, and to the frequency discriminator, which is connected to a pulse shaping portion to shape the output of the frequency discriminator into a square pulse, the pulse shaping portion is connected to a time interval measuring portion, which is connected to a flow velocity arithmetic-logic processing unit to compute the flow velocity.
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patent: 4145925 (1979-03-01), Stasz et al.
patent: 4185498 (1980-01-01), Watson et al.
patent: 4203322 (1980-05-01), Brown et al.
patent: 4262545 (1981-04-01), Lamarche et al.
patent: 4475406 (1984-10-01), Ansaldi et al.
Chang Min Tech Co., Ltd.
Fuller Benjamin R.
Lee Eugene M.
Patel Jagdish
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