Measuring and testing – Volume or rate of flow – System
Patent
1975-03-24
1977-04-26
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
73205R, 128 208, G01F 134
Patent
active
040193829
ABSTRACT:
A fluidic flowmeter for measuring the respiratory function of infants or children comprises a duct through which the infant or child breathes. A convergent pair of supply passages are provided for directing a pair of jets across the duct towards a pair of receiver passages which communicate with and diverge from the duct, the jets merging part way across the duct. A pressure tapping is provided in each receiver passage for sensing the static pressure of fluid flow at a respective point in each receiver passage and there is a differential pressure sensitive transducer having an input connected to one end of the pressure tappings and another input connected to the other pressure tapping. In a preferred embodiment the two receiver passages are connected together to define a loop, the dimensions and configuration of that part of the loop with which the tappings communicate being such that the flow passed each tapping is laminar. A temperature sensitive electrical resistance element or a hot-wire anemometer element may be used in place of the pressure tappings to provide a signal which is indicative of non-turbulent fluid flow through the receiver passages if the receiver passages are sized and configured to ensure laminar flow therethrough.
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patent: 3690171 (1972-09-01), Tippetts et al.
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patent: 3803911 (1972-09-01), Shkatov et al.
patent: 3876009 (1975-04-01), Johnson, Jr.
"Fluidic Wind Sensor Aids Low Airspeed Measurement", in Cont. Eng. vol. 18, No. 4, 4/71, p. 41.
Ferraris Development and Engineering Company Limited
Goldstein Herbert
Greigg Edwin E.
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