INDUCTIVE POSITION SENSOR WITH FREQUENCY CONVERTER AND GOERTZEL FILTER FOR ANALYZING SIGNALS
First Claim
1. A position sensor for detecting a position of a position transmitter, wherein the position sensor is connected to a first electric signal source in order to output a first electric signal with a first frequency and to a second electric signal source in order to output a second electric signal with a second frequency, comprising:
- a primary coil for generating an alternating magnetic field with the first frequency;
a first secondary coil and a second secondary coil, wherein the first secondary coil and the second secondary coil are each magnetically coupled to the primary coil by means of the position transmitter, and wherein a third electric signal is induced in the first secondary coil and a fourth electric signal is induced in the second secondary coil by the generated alternating magnetic field;
a frequency converter for converting the third electric signal into a first intermediate frequency signal and for converting the fourth electric signal into a second intermediate frequency signal, wherein the frequency converter is connectable to the second electric signal source; and
a Goertzel filter bank for the demodulation of the first intermediate frequency signal in order to obtain a first demodulated signal, and for the demodulation of the second intermediate frequency signal in order to obtain a second demodulated signal.
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Accused Products
Abstract
A position sensor connected to first and second electric signal sources to output a first electric signal with a first frequency and a second electric signal with a second frequency. The position sensor includes: a primary coil generating a magnetic alternating field with the first frequency; a first and a second secondary coil, the first and second secondary coils each magnetically coupled to the primary coil by the position transmitter, and third and fourth electric signals induced in the first and second secondary coils respectively by the generated magnetic alternating field; a frequency converter converts the third and fourth electric signals into respective first and second intermediate frequency signals, the frequency converter connectable to the second electric signal source. A Goertzel filter bank demodulates the first intermediate frequency signal to obtain a first demodulated signal and demodulates the second intermediate frequency signal to obtain a second demodulated signal.
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Citations
18 Claims
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1. A position sensor for detecting a position of a position transmitter, wherein the position sensor is connected to a first electric signal source in order to output a first electric signal with a first frequency and to a second electric signal source in order to output a second electric signal with a second frequency, comprising:
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a primary coil for generating an alternating magnetic field with the first frequency; a first secondary coil and a second secondary coil, wherein the first secondary coil and the second secondary coil are each magnetically coupled to the primary coil by means of the position transmitter, and wherein a third electric signal is induced in the first secondary coil and a fourth electric signal is induced in the second secondary coil by the generated alternating magnetic field; a frequency converter for converting the third electric signal into a first intermediate frequency signal and for converting the fourth electric signal into a second intermediate frequency signal, wherein the frequency converter is connectable to the second electric signal source; and a Goertzel filter bank for the demodulation of the first intermediate frequency signal in order to obtain a first demodulated signal, and for the demodulation of the second intermediate frequency signal in order to obtain a second demodulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification