초록 ▼

An electrical flowmeter having signal electrodes laterally spaced along a line perpendicular to fluid flow and sensitive to a voltage field set up in the fluid by a magnetic field is provided with a plurality of planar helically coiled conductive windings disposed in stacked arrangement parallel to

An electrical flowmeter having signal electrodes laterally spaced along a line perpendicular to fluid flow and sensitive to a voltage field set up in the fluid by a magnetic field is provided with a plurality of planar helically coiled conductive windings disposed in stacked arrangement parallel to the direction of fluid flow. The spiral windings are connected to a push-pull current drive source. The signal electrodes are spaced proximate to the outer coil winding of the coil closest to the fluid. The windings of the coils are alternately oriented in opposite, clockwise-counterclockwise disposition. Each spiral coil ends in an inner and an outer terminus, and the inner termini of all coils are connected together, while the outer termini of the clockwise disposed coils are connected in parallel with each other. The outer termini of the counterclockwise disposed coils are also connected in parallel with each other. The electrical field set up in the fluid impresses a voltage field across the signal electrodes proportional to relative fluid velocity and is immune from quadrature and hydrodynamic effects.

대표청구항 ▼

In a flowmeter for measuring relative velocity of fluid flow therepast, the improvement comprising: a plurality of signal electrode means arranged to contact said fluid, and a plurality of stacked planar, spirally wound electromagnetic field producing means, an end one of which is in coplanar arrang

In a flowmeter for measuring relative velocity of fluid flow therepast, the improvement comprising: a plurality of signal electrode means arranged to contact said fluid, and a plurality of stacked planar, spirally wound electromagnetic field producing means, an end one of which is in coplanar arrangement with said signal electrode means and is electrically insulated from said fluid by a separating surface and arranged parallel to a direction of fluid flow to produce a magnetic field normal to the planar orientation of said field producing means at said separating surface to induce an alternating current voltage field in said fluid parallel to said field producing means at said separating surface and perpendicular to the direction of fluid flow, thereby inducing an alternating current in said signal electrode means proportional to the velocity of fluid flow and in phase with said magnetic field.