電磁流量計における磁束分布の影響と脈流の測定

抄録

It is difficult to measure the pulsatile flow pattern with a small size probe of electro magnetic flow meter.
In this paper, the relation between the accuracy and the uniformity of the magnetic field was discussed.
When the magnetic field of electromagnetic flowmeter is non-uniform, conclusion is as follows.
If the flow is steady, the difference of the sensitivity between laminar and turbulent flow measurements is very small and is often able to neglect for average blood flow measurements.
But the error of pulsatile flow measurements is sometimes very large, since the velocity profile of pulsatile flow fluctuates very greatly.
This error could be reduced when the magnetic flux distribute suitably.
I have taken up the problem of trying to design a probe of small size which would sufficiently reduce the effect of the velocity profile on the sensitivity.
The probe which I have discussed in this paper produce only a very slight error in flow pattern measurements. This probe is, moreover, even superior to the uniform magnetic field probe when measuring non-axially symmetrical flow.