Electrodynamic force measuring apparatus

Details Electrodynamic force measuring apparatus Electrodynamic force measuring apparatus

1975-06-20

1977-05-03

Gill, James J.

Measuring and testing

Volumetric content measuring

73517B, G01L 108

Patent

active

040206874

ABSTRACT:
An electrodynamic force measuring apparatus comprising a force coil arranged in a stationary magnetic field and movable out of a null position by means of the force which is to be measured. The force coil is supplied with a current through the agency of an amplifier as a function of its deviation out of the null position as detected by a feeler. This current, under the action of the stationary magnetic field, produces a restoring force which forces back the force coil into the null position. The force coil is connected in series with a compensation coil which varies the field intensity of the stationary magnetic field. The compensation coil is dimensioned to alter the magnetic field resulting from the stationary magnetic field and the magnetic field produced by the current in the force coil in such a manner that the restoring force acting upon the force coil remains proportional to the current.

REFERENCES:
patent: 2685200 (1954-08-01), Slottow et al.
patent: 2940747 (1960-06-01), Eder et al.
patent: 2995935 (1961-08-01), Eyestone et al.
patent: 3046794 (1962-07-01), Fischel
patent: 3680393 (1972-08-01), Rogall

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