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AssigneeHahn-Schickard-Gesellschaft für angewandte Forschung e.V.
InventorsWolfram Geiger, Alexander Gaisser, Norbert Niklasch
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An analogue output signal of a sensor which comprises a carrier signal with a carrier frequency ωC which is modulated by a measurement size is sampled with a sampling frequency ωA to receive a sampled sensor output signal. The frequency ωA of the sampling signal is set so that it is an integer divisor n of the carrier frequency ωC, wherein the phase of the sampling signal is set so that the sampling signal is synchronous to the sensor output signal. The sampled sensor output signal is filtered now to remove periodically repeated signal components from the sampled sensor output signal. Then a filtered useful signal is received, wherein its amplitude is proportional to the measurand detected by the sensor.
Method for processing an analogue output signal (S4) of a sensor (100), wherein the analogue sensor output signal (S4) comprises a carrier signal having a carrier frequency ωC and being modulated by a measurand, wherein the method comprises:
Method according to one of the preceding claims, wherein the sampling signal is obtained by a synchronous frequency division of the carrier signal, wherein the carrier frequency ωC of the carrier signal is an integer multiple n of the sampling frequency ωA, with:
Method according to one of the preceding claims, wherein the carrier frequency ωC of the carrier signal is set to a frequency which is higher or equal to 250 kHz.
Method according to one of the preceding claims, wherein the carrier frequency ωC of the carrier signal is higher than the frequency ωdrive of the useful signal by a factor of 30-500.
Method according to one of the preceding claims, wherein the analogue sensor output signal (S4) is amplified analogously before the step of sampling.
Method according to one of the preceding claims, wherein the amplified analogue sensor output signal is high-pass filtered before the step of sampling to essentially remove low-frequency components of the signal (S4).
Method according to one of the preceding claims, wherein the analogue sensor output signal (S4) is amplitude-modulated by the measurand.
Method according to one of the preceding claims, wherein the measurand is a rotational rate.
Method according to one of the preceding claims, wherein the sensor (100) is a capacitive sensor.
Method according to one of the preceding claims, wherein the carrier signals are fed into the sensor (100) at a center electrode of the same, wherein the sensor output signal is output to exterior electrodes of the sensor (100).
Method according to one of the preceding claims, wherein the useful signal is input into a digital signal processor (130), wherein the digital signal processor outputs an analogue or a digital signal representing the measurand.
Device for processing an analogue output signal (S4) of a sensor (100), wherein the analogue sensor output signal (S4) comprises a carrier signal having a carrier frequency ωC and being modulated by a measurand, the device comprising:
Dependencies are inferred from the claim text.