Method and device for position detection of an object along an acoustic-signal conductor
AssigneeK.A. Schmersal GmbH & Co.
InventorChristian Oelschlegel
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Abstract
The invention relates to the detection of the position of an object which can be moved along an acoustic-signal conductor of ferromagnetic material, in which an acoustic signal is incoupled in a clocked manner into the acoustic-signal conductor by means of a signal input coupler connected to a signal transmitter, extracted by means of a signal output coupler and the extracted signal is evaluated by an evaluating circuit for generating a signal representative of the instantaneous position of the object, wherein an opposite magnetic field for the magnetic field generated by the acoustic signal is incoupled in each case after the incouplion of the acoustic signal.
Claims22
A method for detecting the position of an object moveable along an acoustic-signal conductor of ferromagnetic material, comprising the steps:
- incoupling an acoustic signal in a clocked manner into the acoustic-signal conductor by means of a signal input coupler connected to a signal transmitter;
- extracting the incoupled signal by means of a signal output coupler;
- and evaluating the extracted signal by an evaluating circuit for generating a signal representative of the instantaneous position of the object;
- wherein after the acoustic signal has been incoupled, an opposite magnetic field is applied for compensating for the residual magnetization originating from the incoupling of the acoustic signal.
A method for detecting the position of an object moveable along an acoustic-signal conductor of ferromagnetic material, comprising the steps of;
- incoupling an acoustic signal in a clocked manner into the acoustic-signal conductor by means of a signal input coupler connected to a signal transmitter;
- extracting the incoupled signal by means of a signal output coupler;
- and evaluating the extracted signal by an evaluating circuit for generating a signal representative of the instantaneous position of the object;
- wherein in each case after the acoustic signal has been incoupled, a number of acoustic compensation signals having the opposite phase to the incoupled acoustic signal are incoupled at the beginning and subsequently in each case with changing phases and decreasing amplitude.
A device for detecting the position of an object moveable along an acoustic-signal conductor of ferromagnetic material, comprising a signal input coupler connected to a signal transmitter for the clocked incoupling of an acoustic signal into the acoustic-signal conductor and a signal output coupler which is connected to an evaluating circuit for generating a signal representative of the instantaneous position of the object, wherein in each case after the incoupling of the acoustic signal, an opposite magnetic field can be incoupled for compensating for the residual magnetization originating from the incoupling of the acoustic signal.
A device for detecting the position of an object moveable along an acoustic-signal conductor of ferromagnetic material, comprising a signal input coupler connected to a signal transmitter for the clocked incoupling of an acoustic signal into the acoustic-signal conductor and a signal output coupler which is connected to an evaluating circuit for generating a signal representative of the instantaneous position of the object, wherein in each case after incoupling of the acoustic signal, a sequence of a number of acoustic compensation signals with opposite phase to the incoupled acoustic signal can be incoupled at the beginning and subsequently in each case with changing phases and decreasing amplitude.
Dependencies are inferred from the claim text.