Oscillation sensor with calibration unit and measurement device
AssigneePepperl + Fuchs GmbH
InventorJochen Vater
Life of this patent
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Abstract
The invention relates to an oscillating sensor for a measurement device comprising: an oscillator comprising: a resonance circuit for providing an oscillation signal; a gain stage configured to provide a feed-back to the resonance circuit to inject energy for excitation of the oscillator to maintain oscillation; at least one calibration element to adjust the open loop gain of the oscillator; a calibration unit to provide a modulated calibration control signal to selectively adjust an electrical measure of the at least one calibration element based on at least one predetermined duty cycle, wherein the calibration unit is further configured to provide the modulated calibration control signal with at least one cycle frequency which depends on the oscillation frequency.
Claims14
Oscillating sensor for a measurement device comprising:
- an oscillator comprising:
- a resonance circuit for providing an oscillation signal;
- a gain stage configured to provide a feed-back to the resonance circuit to inject energy for excitation of the oscillator to maintain oscillation;
- at least one calibration element to adjust an open loop gain of the oscillator;
- a calibration unit to provide a modulated calibration control signal to selectively adjust an electrical measure of the at least one calibration element based on at least one predetermined duty cycle,
- characterized in that
- a frequency counter is provided to measure an oscillation frequency of the oscillation signal and to provide an indication of the oscillation frequency to the calibration unit, and that
- the calibration unit is further configured to provide the modulated calibration control signal with at least one cycle frequency which depends on the oscillation frequency of the oscillation signal.
Method for operating an oscillation sensor, the oscillation sensor comprising an oscillator, the oscillator comprising a resonance circuit for providing an oscillation signal, a gain stage configured to feed back to the resonance circuit to inject energy for excitation of the resonance circuit to maintain oscillation, the oscillation sensor further comprising at least one calibration element to adjust a feedback coupling between the gain stage and the resonance circuit, wherein an electrical measure of the at least one calibration element is adjusted based on at least one predetermined duty cycle of a modulated calibration control signal
- characterized in that
- a frequency counter is provided to measure an oscillation frequency of the oscillation signal and to provide an indication of the oscillation frequency to the at least one calibration unit, and that
- the modulated calibration control signal has at least one cycle frequency, which depends on the oscillation frequency of the oscillation signal.
Dependencies are inferred from the claim text.