OSCILLATION SENSOR WITH CALIBRATION UNIT AND MEASUREMENT DEVICE
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Accused Products
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 feed back 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.
4 Citations
34 Claims
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1-14. -14. (canceled)
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15. Oscillating sensor for a measurement device comprising:
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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; 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, characterized in that the modulated calibration control signal has an irregularly time-varying cycle frequency. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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- 32. Measurement device comprising an oscillating sensor and an analyzing circuit which is configured to receive an indication of the oscillation signal and to provide an amplitude signal as a sensor signal indicating the amplitude of the oscillation signal.
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34. 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 the 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.
Specification