Electromagnetic flowmeter

Details Electromagnetic flowmeter Electromagnetic flowmeter

1986-08-21

1988-03-01

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

128691, G01F 158

Patent

active

047277548

ABSTRACT:
A probe for an electromagnetic flowmeter in miniaturized format, particularly for blood flow measurements, has two magnetic coils which are oppositely wound on a toroidal core of permanent magnetic material. Two electrodes respectively connected to the coils are disposed inside the core. The core has a layer structure of extremely thin wafers of material having high magnetic resonance and thin insulating layers in alternation. For re-magnetization of the core, the coils are charged with extremely brief and high current pulses. The measured signal is taken when the pulsed current for magnetization of the coils has decayed.

REFERENCES:
patent: 3309924 (1967-03-01), Kolin et al.
patent: 4409846 (1983-10-01), Ueno
patent: 4601209 (1986-07-01), Amata
"Transducers For Biomedical Measurements: Principles and Applications," Cobbold, 1974 pp. 244-315.

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