Inductive sensor arrangement and measuring arrangement for use thereof
First Claim
1. An inductive sensor arrangement comprising a laminar coil carrier, transmitting coil means consisting of at least one transmitting coil, HF-oscillator means connected to supply said transmitting coil means with an a.c. voltage, receiving coil means consisting of at least one receiving coil, at least one of said coils of said transmitting coil means and said receiving coil means being applied as a metal layer to a surface of said laminar coil carrier, and said transmitting coil means and said receiving coil means being mounted in relation to said coil carrier for alternating current, when induced in said receiving coil means by said transmitting coil means, to be dependent in respect of at least one of the current values of phase relationship and amplitude, on the relative position of a metal article to be sensed with respect to the sensor arrangement, the winding axes of said coil means in use being oriented toward the article, at least one of said transmitting coil means and said receiving coil means comprising at least two coils, said at least two coils of the one said coil means and the other of said coil means being arranged with symmetry with respect to a feature of said laminar coil carrier, said symmetry being selected from axial symmetry with respect to at least one axis of symmetry on said laminar coil carrier and point symmetry with respect to at least one point of symmetry on said laminar coil carrier, whereby the distance or relative position of a surface irregularity or an edge of the metal article can be determined, and means for transmitting a signal according to such determination.
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Accused Products
Abstract
The sensor arrangement according to the invention serves to determine the spacing from a non-magnetic or ferro-magnetic article. In addition, it seeks to make it possible to determine the relative position of the sensor with respect to irregularities on the article such as gaps or holes. The inductive sensor arrangement has an oscillator which feeds a transmitting coil which in turn induces alternating current, in dependence on the relative position with respect to the article, in a receiving component coil. By virtue of the transmitting and/or receiving component coil being in the form of a metal layer on at least one surface of a laminar coil carrier, it is possible substantially to improve measuring accuracy and also the degree of sensitivity of the sensor arrangement.
60 Citations
18 Claims
- 1. An inductive sensor arrangement comprising a laminar coil carrier, transmitting coil means consisting of at least one transmitting coil, HF-oscillator means connected to supply said transmitting coil means with an a.c. voltage, receiving coil means consisting of at least one receiving coil, at least one of said coils of said transmitting coil means and said receiving coil means being applied as a metal layer to a surface of said laminar coil carrier, and said transmitting coil means and said receiving coil means being mounted in relation to said coil carrier for alternating current, when induced in said receiving coil means by said transmitting coil means, to be dependent in respect of at least one of the current values of phase relationship and amplitude, on the relative position of a metal article to be sensed with respect to the sensor arrangement, the winding axes of said coil means in use being oriented toward the article, at least one of said transmitting coil means and said receiving coil means comprising at least two coils, said at least two coils of the one said coil means and the other of said coil means being arranged with symmetry with respect to a feature of said laminar coil carrier, said symmetry being selected from axial symmetry with respect to at least one axis of symmetry on said laminar coil carrier and point symmetry with respect to at least one point of symmetry on said laminar coil carrier, whereby the distance or relative position of a surface irregularity or an edge of the metal article can be determined, and means for transmitting a signal according to such determination.
- 15. A measuring arrangement for determining the relative position of a sensor arrangement with respect to a metal article, comprising a sensor arrangement including transmitting coil means and receiving coil means, at least one of said transmitting coil means and said receiving coil means being divided into at least two component coils, an HF-oscillator, means connecting said HF-oscillator to said transmitting coil, an evaluation circuit for determining at least one of the values of phase relationship and voltage of an alternating current induced in said receiving coil means by said transmitting coil means while dependent on changes in the relative position of the article and said sensor arrangement, and change-over switching means interposed between on the one hand one of said transmitting coil means and said receiving coil means and on the other hand said evaluation circuit for selectively connecting at least one of said component coils to said evaluation circuit.
Specification