Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1983-09-30
1985-03-12
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386115, G01F 158
Patent
active
045037116
ABSTRACT:
A travelling wave magnetic flowmeter senses the velocity of flow of an electrically conductive fluid through a conduit and provides an output signal representative of the velocity of flow. A first pair of coils providing a first magnetic field and a second pair of coils providing a second magnetic field are disposed on the conduit. The first and second magnetic fields are varied in strength and at least partially combined to form a travelling composite magnetic field, a portion of which interacts with the fluid to induce an electromotive force. A pair of electrodes are electrically isolated from the conduit and disposed in the conduit between the first and second coils. The electrodes are electrically coupled to the fluid to provide a detected signal representative of the electromotive force. A control circuit coupled to the first and second coils and coupled to the electrodes to receive the detected signal, controls an electrical current shifted between the first coils and the second coils such that the travelling composite magnetic field travels in the direction of fluid flow at a speed representative of the fluid velocity.
REFERENCES:
patent: 2750461 (1956-06-01), Bunch
patent: 3714826 (1973-02-01), Tsunoda et al.
patent: 3967500 (1976-07-01), Forster
patent: 4236411 (1980-12-01), Ketelsen
patent: 4346605 (1982-08-01), Skladzien et al.
Book entitled, "The Theory of Electromagnetic Flow-Measurement", by J. A. Shercliff, Cambridge at the University Press, 1962, pp. 102, 103.
Rosemount Inc.
Ruehl Charles A.
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