Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1985-08-12
1986-12-09
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
7386122, G01F 172
Patent
active
046272941
ABSTRACT:
A flow meter comprising a pulsed eddy generator disposed at an upstream section in the flow passage and an eddy sensor disposed at a downstream section, wherein the pulsed eddy generator is programmed to be activated automatically following a predetermined brief period of deactivation, which brief period of deactivation starts at the moment the eddy generator is switched from an activation mode to a deactivation mode by the eddy sensor that senses the leading edge of the eddy stream generated by the eddy generator during a preceding activation. As a consequence, the eddy generator generates a series of pulsed eddy streams created during the activation of the eddy generator, wherein each of which pulsed eddy streams is interceded by silent streams created during the deactivation period of the eddy generator. The representative fluid velocity is obtained by dividing the distance between the eddy generator and the eddy sensor by the duration of each activated period of the eddy generator, which duration is equal to the period of one complete cycle of the pulsed flow minus the predetermined duration of the deactivated period of the eddy generator. The actual flow rate is obtained by calibrating and/or statistically analyzing the representative velocity, which may be carried out by a microcomputer or microprocessor.
REFERENCES:
patent: 2637208 (1953-05-01), Mellen
patent: 4480483 (1984-11-01), McShane
patent: 4491024 (1985-01-01), Miller
patent: 4543834 (1985-10-01), Hasegawa et al.
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