The Design of Electromagnetic Flowmeter Probes with Homogeneous Luminal Magnetic Fields

Inhomogeneities in magnetic field density are not very critical in pulsating arterial flow, but may be an important consideration in venous flow and branch or asymmetric flow. In this regard, a blood flow probe design has been developed with a magnetic field distribution which varies less than 1% across the lumen. It is shown that the luminal fields of two commercially available probes vary as much as 25%.