公开(公告)号：US4389898A

公开(公告)日：1983-06-28

申请号：US213128

申请日：1980-12-04

Applicant: James C. Long ,  James K. Palmer

Inventor： James C. Long ,  James K. Palmer

IPC: G01F1/58

CPC classification number: G01F1/58

Abstract: A low power, reliable velocity transducer is particularly adapted to measure the flow of a fluid in a metallic pipe. A pair of U-shaped cores of high magnetic permeability are arranged side-by-side and surrounded by an energizing coil to provide an electromagnet of high electromagnetic energy conversion efficiency and low susceptibility to stray and shunt fields. A triad of electrodes is mounted thereon to detect a resultant electric field from the interaction of the velocity of the flow with the imposed magnetic field. Conductors engaged to the measuring electrodes effect a generally S-shaped geometry so that the signals applied to a differential amplifier to derive the E field waveforms are unencumbered by induced currents unrelated to the cross product of B and V.

Abstract translation: 低功率，可靠的速度传感器特别适用于测量金属管中流体的流动。 一对高磁导率的U形磁芯并排布置，并被激励线圈包围，以提供高电磁能转换效率的电磁体和对杂散和分流场的低磁化率。 电极的三元组被安装在其上以从流动速度与所施加的磁场的相互作用检测所得到的电场。 接合到测量电极的导体大体上形成S形几何形状，使得施加到差分放大器以导出E场波形的信号不受与B和V的交叉积无关的感应电流的阻碍。