Oscillation sensor with calibration unit and measurement device
AssigneePepperl + Fuchs GmbH
InventorThomas Kühn
Life of this patent
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Abstract
The present 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 feedback to the resonance circuit to inject energy for excitation of the resonance circuit 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 modulated calibration control signal has an irregularly time-varying cycle frequency.
Claims20
Oscillating sensor for a measurement device comprising:
- an oscillator comprising,
- a resonance circuit for providing an oscillation signal;
- a gain stage configured to feedback to the resonance circuit to inject energy for excitation of the resonance circuit 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
- the modulated calibration control signal has an irregularly time-varying cycle frequency,
- wherein the irregularly time-varying cycle frequency is carried out without having an effect on the at least one predetermined duty cycle.
Method for operating an oscillation sensor comprising an 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, and at least one calibration element to adjust an open loop gain of the oscillator, 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
- the modulated calibration control signal has an irregularly time-varying cycle frequency,
- wherein the irregularly time-varying cycle frequency is carried out without having an effect on the at least one predetermined duty cycle.
Dependencies are inferred from the claim text.