Transmitter device, sensor device and method for sensing a magnetic field change
AssigneeSiemens Mobility GmbH
InventorRainer Freise
Life of this patent
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Abstract
A transmitter device for a sensor device detects a magnetic field change caused by an object approaching or moving past the sensor device, in particular by a wheel of a rail vehicle. The transmitter device has at least two alternating-current-fed transmitter oscillating circuits. In order to implement error disclosure of the sensor device in a particularly simple manner, the at least two transmitter oscillating circuits are formed in such a way that the resonance frequencies thereof are different from each other. A sensor device and a method for detecting a magnetic field change are also provided.
Claims5
A sensor device for detecting a magnetic field change caused by an object approaching or moving past the sensor device, the sensor device comprising:
- at least one transmitter device including at least two alternating-current-fed transmitter oscillating circuits for forming a transmitter frequency of said at least one transmitter device, said at least two transmitter oscillating circuits being constructed to have resonance frequencies being different than each other;
- at least one monitoring device for determining the transmitter frequency of said at least one transmitter device and for checking whether the determined transmitter frequency is in a predetermined frequency range;
- and
- at least one receiver device.
A method for detecting a magnetic field change caused by an object approaching or moving past a sensor device in a direction of movement of the sensor device, the method comprising the following steps:
- using at least two alternating-current-fed transmitter oscillating circuits to form a transmitter frequency of a transmitter device;
- forming the transmitter frequency from at least two different resonance frequencies of the at least two transmitter oscillating circuits;
- forming each of the at least two resonance frequencies with a frequency outside a predetermined frequency range of the transmitter frequency;
- and
- determining the transmitter frequency and generating a warning signal when the determined transmitter frequency is outside the predetermined range.
Dependencies are inferred from the claim text.