Electromagnetic flowmeter
AssigneeKlaus Thurau
InventorJohannes Ruckel
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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.
Claims8
A probe for an electromagnetic flowmeter for measuring the flow rate of fluid in a conduit comprising:
- an annular core which can be placed around said conduit consisting of a plurality of alternating sheets of permanent magnetic material having a thickness of 10 .mu.m and sheets of insulating material;
- a coil wound around said core for generating a magnetic field extending transversely to the direction of flow of said fluid in said conduit upon electrical excitation of said coil, said coil having two oppositely wound coil sections;
- two electrodes disposed opposite each other on the interior of said core;
- and
- an electrode lead for each of said electrodes extending perpendicularly to said direction of flow and having a diameter of less than 0.8 mm.
Dependencies are inferred from the claim text.