Device for determining geometric parameters of a structural element
AssigneeRobert Bosch GmbH
InventorsKlaus Dobler, Hansjoerg Hachtel
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Abstract
A measuring device for contactless control of a design of structural elements composed of an electrically conductive material comprises at least one coil through which an alternating current flows and whose measuring voltage is influenced by a structural element, and electronic evaluating unit arranged to compare the measuring voltage of the coil influenced by the structural element with a nominal value, the coil being formed as a cylindrical coil.
Claims3
A device for determining geometric parameters of a screw-shaped structural element, comprising a first cylindrical coil for determining a first geometric parameter, said first cylindrical coil having a length substantially corresponding to a length of the structural element;
- a second coil spaced from said first cylindrical coil and arranged opposite said first cylindrical coil for determining a second geometric parameter, said first and second coils being adapted to be located at different sides of a structural element and connectable to a source of an alternating voltage that provides for flow of an alternating current through said first and second coil, and each of said first and second coils generating a signal representative of a respective parameter of the structural element resulting from a change in an alternating current resistance in a respective coil caused by eddy current generated in the structural element by flow of the alternating current through the respective coil;
- and evaluating means for comparing the signal generated by each of said first and second coils with a nominal value for the respective parameter of the structural element to thereby provide an evaluation of the respective parameters.
Dependencies are inferred from the claim text.