| 摘要 |
A variable area flowmeter employing a vertical tube containing a displaceable magnet and a closed-loop magnetic detection circuit. The closed-loop magnetic detection circuit includes first and second magnetic cores each having a sense coil and a compensation coil. The sense coil provides an output related to magnetic field strength. With a feedback technique, the compensation coil compensates for the magnetic field through the sense coil. Field strength is determined by monitoring feedback. Displacement of the displaceable magnet is determined using information from the first and second magnetic cores. The detection circuit produces an output proportional to the position of the magnet within the tube. This output is translated into fluid flow.
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