Non-contact position sensor
First Claim
1. Non-contacting displacement sensor with a measuring coil to which an alternating current can be applied, the measuring coil having at least two voltage taps, with an electrically and/or magnetically conductive measuring object, and with an evaluation circuit for evaluating and determining an output voltage that corresponds to the position of the measuring object with respect to the voltage taps, the measuring object being arranged and displaceable in the interior of the measuring coil, and the total impedance of the measuring coil being independent of the position of the measuring object, wherein sources-of alternating current supply the measuring coil and the sources of alternating current are provided by a source of ac voltage and intermediate resistors.
2 Assignments
0 Petitions
Accused Products
Abstract
A noncontacting displacement sensor (1) is proposed with a measuring coil (2) to which alternating current can be applied, the measuring coil (2) having at least two voltage taps (3), with an electrically and/or magnetically conductive measuring object (5), and with an evaluation circuit (4) for evaluating and, if need be, determining an output voltage that corresponds to the position of the measuring object (5) with respect to the voltage taps (3). To provide the displacement sensor of a structural form that is as compact as possible, the measuring object (5) is arranged and displaceable in the interior of the measuring coil (2), the total impedance of the measuring coil (2) being independent of the position of the measuring object (5).
48 Citations
34 Claims
- 1. Non-contacting displacement sensor with a measuring coil to which an alternating current can be applied, the measuring coil having at least two voltage taps, with an electrically and/or magnetically conductive measuring object, and with an evaluation circuit for evaluating and determining an output voltage that corresponds to the position of the measuring object with respect to the voltage taps, the measuring object being arranged and displaceable in the interior of the measuring coil, and the total impedance of the measuring coil being independent of the position of the measuring object, wherein sources-of alternating current supply the measuring coil and the sources of alternating current are provided by a source of ac voltage and intermediate resistors.
- 28. Noncontacting displacement sensor with a measuring coil to which an alternating current can be applied, the measuring coil having at least two voltage taps, with an electrically and/or magnetically conductive measuring object, and with an evaluation circuit for evaluating and determining an output voltage that corresponds to the position of the measuring object with respect to the voltage taps, the measuring object being arranged and displaceable in the interior of the measuring coil, and the total impedance of the measuring coil being independent of the position of the measuring object, wherein means for compensating the temperature are provided, which comprise a source of ac voltage and parallel thereto a source of dc voltage that is connected via at least one resistor to the measuring coil, that the means for compensating the temperature comprise a component for determining the absolute value of the temperature and an evaluation circuit with two channels, wherein the dc component can be determined in the first channel and the ac component of the output signal of the measuring coil in the second channel.
- 33. Noncontacting displacement sensor with a measuring coil to which an alternating current can be applied, the measuring coil having at least two voltage taps, with an electrically and/or magnetically conductive measuring object, and with an evaluation circuit for evaluating and determining an output voltage that corresponds to the position of the measuring object with respect to the voltage taps, the measuring object being arranged and displaceable in the interior of the measuring coil, and the total impedance of the measuring coil being independent of the position of the measuring object, wherein the measuring coil is wound on a coil tube that comprises openings for applying pressures, that the position of the measuring object adjusts itself based on the applied pressures, and that the measuring coil is a toroidal coil, wherein a plurality of voltage taps extend via resistors and a junction to an input of the evaluation circuit.
Specification