ELECTRICAL BRIDGE APPARATUS FOR AND METHOD OF MEASURING MECHANICAL FORCES BY MAGNETOELASTIC MEMBERS
First Claim
1. In apparatus for measuring mechanical forces with two measuring members of which one is capable of accepting a load and the other is not loadable, the members having magnetization windings which are arranged in a bridge circuit, the bridge having the two magnetization windings in first and second branches connected to each other at a first junction, the third and fourth branches having rectifiers therein, the bridge being fed with alternating current at the junctions beyond the ends of the series connected magnetization windings, the measuring voltage being taken off the bridge from the junctions between the first and second and beTween the third and fourth branches, the improvement comprising a combination of a series connected inductance and condenser connected in parallel with each of the respective magnetization windings, the resistances being such as to increase the output potential of the bridge, to decrease deviations from linearity, and to lower the creeping fault of the first measuring member caused by the magnetic viscosity of the measuring member, each of the series connected inductance and condenser combination comprising a series connected choke coil and a condenser, the third and fourth branches of the bridge circuit being each connected to the junction between the respective choke coil and condenser.
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Abstract
Force-measuring apparatus and method employing two similar measuring members, one loaded and the other unloaded, carrying magnetizing windings disposed in different branches of a bridge energized by alternating current. The present invention changes the energy relationships of the magnetizing fields by providing additional measuring circuits and auxiliary circuits with inductive, capacitive and ohmic resistance or resistance combinations which, when load changes occur, bring about changes in the measuring potential such as to increase the measuring voltage output, at least substantially linearize the measuring members, and substantially or wholly eliminate the creep or creeping effects of the measuring members.
3 Citations
3 Claims
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1. In apparatus for measuring mechanical forces with two measuring members of which one is capable of accepting a load and the other is not loadable, the members having magnetization windings which are arranged in a bridge circuit, the bridge having the two magnetization windings in first and second branches connected to each other at a first junction, the third and fourth branches having rectifiers therein, the bridge being fed with alternating current at the junctions beyond the ends of the series connected magnetization windings, the measuring voltage being taken off the bridge from the junctions between the first and second and beTween the third and fourth branches, the improvement comprising a combination of a series connected inductance and condenser connected in parallel with each of the respective magnetization windings, the resistances being such as to increase the output potential of the bridge, to decrease deviations from linearity, and to lower the creeping fault of the first measuring member caused by the magnetic viscosity of the measuring member, each of the series connected inductance and condenser combination comprising a series connected choke coil and a condenser, the third and fourth branches of the bridge circuit being each connected to the junction between the respective choke coil and condenser.
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2. Apparatus according to claim 1, comprising an ohmic resistance connected in series with the respective magnetization winding in each of the respective first and second branches of the bridge.
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3. Apparatus according to claim 1, comprising a second condenser connected in parallel with the respective magnetization windings.
Specification
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Current AssigneeHermann Goebbels
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Original AssigneeHermann Goebbels
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InventorsGoebbels, Hermann
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Primary Examiner(s)Lynch, Michael J.
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Assistant Examiner(s)Corcoran, R. J.
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Application NumberUS04/884,130Time in Patent Office782 DaysField of Search324/34R,34S,34ST,34TR,6B,61B 323/75M,75J 73/133BUS Class Current324/209CPC Class CodesG01L 1/125 by using magnetostrictive m...G01L 1/127 by using inductive means G0...
