Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1996-07-29
1997-11-25
Dougherty, Elizabeth L.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386115, G01F 158
Patent
active
056914849
ABSTRACT:
Sensors for measuring the flow rate of fluids flowing through a chamber. The chamber is formed using electrically insulating material through which there is an orthogonal alternating magnetic field provided by a mechanically repositioned permanent magnet and at least a pair of electrodes in line with and orthogonal to the magnetic field. This provides an electrical potential with a magnitude proportional to flow rate. The alternating magnetic field may also be provided by a stationary multiple electromagnet. Various embodiments are disclosed which make use of electromagnetics, stepper motors and other modifications for adapting the flow sensor to a wide variety of applications and environmental conditions.
REFERENCES:
patent: 3777561 (1973-12-01), Lewis
patent: 3802262 (1974-04-01), Banks
patent: 3897684 (1975-08-01), Dewan
patent: 3903741 (1975-09-01), Greene
patent: 3967500 (1976-07-01), Forster
patent: 4195515 (1980-04-01), Smoll
patent: 4825703 (1989-05-01), Kubota
Dougherty Elizabeth L.
Noori Max H.
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