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Abstract

A magnetohydrodynamic sensor having an annular or circular sense channel containing a conductive liquid proof mass. A radial flow is introduced into the annular channel which, in response to rotation of the device, produces a coriolis force and resulting circumferential velocity of the fluid. An electromagnetic winding produces an alternating electromagnetic field directed perpendicular to the annular channel. First and second electrodes sense a time varying electric potential induced between the center of the annular channel and the circumference of the annular channel. The time varying electrical potential is proportional to the strength of the time varying electric field and rotational velocity of the channel with respect to said proof mass. The transformer connected to the electrodes provides for amplification of the signal representing the rotational velocity of the channel with respect to the proof mass. Synchronous detection of the alternating voltage produced by the electrodes permits very small angular velocities to be measured.

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First Claim