Measuring device and measured quantity sensor having coupled processing and excitation frequencies
First Claim
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1. A measuring device for determining a measured quantity, comprising:
- an oscillatory structure in which an oscillation signal is detectable;
an exciter configured to excite the oscillatory structure by an excitation frequency to result in an oscillation with an oscillation frequency;
a processor configured to process the oscillation signal synchronous to the oscillation frequency or the excitation frequency; and
an evaluator configured to determine the measured quantity based on the processed oscillation signal, wherein the oscillatory structure comprises a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling depending on the measured quantity, wherein the oscillatory structure is excitable to result in an oscillation in the first oscillation mode by an excitation by the exciter at the excitation frequency, and the oscillatory structure is coupled to the processor such that a signal resulting from the oscillation of the mechanical structure in the second oscillation mode is available for the processor as a detectable oscillation signal.
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Abstract
A measuring device for determining a measured quantity having an oscillatory structure where an oscillation signal is detectable. The measuring device further includes a device for exciting the oscillatory structure by an excitation frequency to result in an oscillation of an oscillation frequency. The measuring device further has a device for processing the oscillation signal by a frequency depending on the oscillation frequency and the excitation frequency. Furthermore, the measuring device includes an evaluator for determining the measured quantity based on the oscillation signal processed.
17 Citations
53 Claims
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1. A measuring device for determining a measured quantity, comprising:
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an oscillatory structure in which an oscillation signal is detectable; an exciter configured to excite the oscillatory structure by an excitation frequency to result in an oscillation with an oscillation frequency; a processor configured to process the oscillation signal synchronous to the oscillation frequency or the excitation frequency; and an evaluator configured to determine the measured quantity based on the processed oscillation signal, wherein the oscillatory structure comprises a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling depending on the measured quantity, wherein the oscillatory structure is excitable to result in an oscillation in the first oscillation mode by an excitation by the exciter at the excitation frequency, and the oscillatory structure is coupled to the processor such that a signal resulting from the oscillation of the mechanical structure in the second oscillation mode is available for the processor as a detectable oscillation signal. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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4. A measuring device for determining a measured quantity, comprising:
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an oscillatory structure in which an oscillation signal is detectable; an exciter configured to excite the oscillatory structure by an excitation frequency to result in an oscillation with an oscillation frequency; a processor configured to process the oscillation signal synchronous to the oscillation frequency or the excitation frequency; and an evaluator configured to determine the measured quantity based on the processed oscillation signal, the processor comprising a filter having a filter characteristic depending on the oscillation frequency or the excitation frequency, wherein the filter characteristic is determined by an analog device of an impedance which depends on the oscillation frequency or the excitation frequency.
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15. A measured quantity sensor comprising:
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an oscillatory structure comprising a first detection terminal at which an oscillation signal is detectable, and an excitation terminal, wherein the oscillatory structure is excitable to result in an oscillation with an oscillation frequency by applying an excitation signal with an excitation frequency to the excitation terminal; an excitation circuit comprising an output coupled to the excitation terminal; a signal processor comprising an input coupled to the first detection terminal, a frequency input to which a signal of a frequency which depends on the oscillation frequency of the oscillatory structure or the excitation frequency at the excitation terminal may be applied, and an output; and an evaluation circuit comprising an input coupled to the output of the signal processor, and an output representing a measured quantity sensor output of the measured quantity sensor, wherein the oscillatory structure comprises a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling which depends on a measured quantity of the measured quantity sensor to be measured, wherein the mechanical structure is excitable to result in an oscillation in the first oscillation mode by applying the excitation signal to the excitation terminal, and a signal which results from an oscillation of the mechanical structure in the second oscillation mode is detectable as the oscillation signal at the first detection terminal. - View Dependent Claims (16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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18. A measured quantity sensor, comprising:
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an oscillatory structure comprising a first detection terminal at which an oscillation signal is detectable, and an excitation terminal, wherein the oscillatory structure is excitable to result in an oscillation with an oscillation frequency by applying an excitation signal with an excitation frequency to the excitation terminal; an excitation circuit comprising an output coupled to the excitation terminal; a signal processor comprising an input coupled to the first detection terminal, a frequency input to which a signal of a frequency which depends on the oscillation frequency of the oscillatory structure or the excitation frequency at the excitation terminal may be applied, and an output; and an evaluation circuit comprising an input coupled to the output of the signal processor, and an output representing a measured quantity sensor output of the measured quantity sensor, wherein the signal processor additionally comprises a filter having a filter characteristic depending on the oscillation frequency or the excitation frequency, wherein the filter characteristic is determined by an analog device of an impedance which depends on the oscillation frequency or the excitation frequency.
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28. A measured quantity sensor, comprising:
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a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprises a coupling which depends on a measured quantity of the measured quantity sensor to be measured; a first excitation terminal at which an oscillation of the mechanical structure with an oscillation frequency in the first oscillation mode is excitable by exciting the mechanical structure by an excitation frequency; a first detection terminal at which an oscillation of the mechanical structure in the second oscillation mode is detectable;
a second detection terminal at which the oscillation of the mechanical structure in the first oscillation mode is detectable;an excitation circuit comprising an output coupled to the first excitation terminal, wherein the excitation circuit forms a control loop with a feedback branch coupled to the second detection terminal; a signal processor comprising an input coupled to the first detection terminal, a frequency input coupled to a circuit part of the excitation circuit where the excitation frequency at the first excitation terminal is detectable or to the second detection terminal, and an output; and an evaluation circuit comprising an input coupled to the output of the signal processor, and an output representing a measured quantity sensor output of the measured quantity sensor. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for determining a measured quantity by means of an oscillatory structure, comprising:
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exciting the oscillatory structure by an excitation frequency to result in an oscillation with an oscillation frequency; detecting an oscillation signal at the oscillatory structure; processing the oscillation signal by a frequency which depends on the oscillation frequency or the excitation frequency; and determining the measured quantity based on the oscillation signal processed, wherein the step of processing includes a step of sampling by a sample frequency which depends on the oscillation frequency or the excitation frequency, wherein the oscillatory structure comprises a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling depending on the measured quantity, wherein exciting the oscillatory structure comprises exciting the oscillatory structure by an excitation frequency to result in an oscillation in the first oscillation mode, and sampling comprises sampling a siqnal as the detectable oscillation signal resulting from an oscillation of the mechanical structure in the second oscillation mode. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A measuring method comprising:
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exciting a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling depending on a measured quantity to be measured, by an excitation frequency to result in an oscillation of the mechanical structure of an oscillation frequency in the first oscillation mode; detecting an oscillation of the mechanical structure in the second oscillation mode; detecting the oscillation of the mechanical structure in the first oscillation mode; regulating the excitation frequency, an excitation amplitude or an excitation phase depending on the detected oscillation of the mechanical structure in the first oscillation mode; processing the detected oscillation of the mechanical structure in the second oscillation mode by a frequency depending on the excitation frequency or the oscillation frequency of the oscillation in the first oscillation mode; and determining the measured quantity to be measured on the basis of the processed oscillation of the mechanical structure in the second oscillation mode. - View Dependent Claims (49)
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50. A computer program product comprising a program code on a computer-readable medium, the program code when executed on a computer or microcontroller performing a method for determining a measured quantity by means of an oscillatory structure, comprising:
- exciting the oscillatory structure by an excitation frequency to result in an oscillation of an oscillation frequency;
detecting an oscillation signal at the oscillatory structure;
processing the oscillation signal by a frequency which depends on the oscillation frequency or the excitation frequency; anddetermining the measured quantity based on the oscillation signal processed, wherein the processing includes sampling by a sample frequency which depends on the oscillation frequency or the excitation frequency, wherein the oscillatory structure comprises a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling depending on the measured quantity, wherein the exciting the oscillatory structure comprises exciting the oscillatory structure by an excitation frequency to result in an oscillation in the first oscillation mode, and the samplinq comprises sampling a signal as the detectable oscillation signal resulting from an oscillation of the mechanical structure in the second oscillation mode.
- exciting the oscillatory structure by an excitation frequency to result in an oscillation of an oscillation frequency;
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51. A computer program product comprising a program code on a computer-readable medium, the program code when executed on a computer or microcontroller performing a measuring method comprising:
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exciting a mechanical structure capable of oscillating in a first oscillation mode and a second oscillation mode which comprise a coupling depending on a measured quantity to be measured, by an excitation frequency to result in an oscillation of the mechanical structure of an oscillation frequency in the first oscillation mode; detecting an oscillation of the mechanical structure in the second oscillation mode;
detecting the oscillation of the mechanical structure in the first oscillation mode;regulating the excitation frequency, an excitation amplitude or an excitation phase depending on the detected oscillation of the mechanical structure in the first oscillation mode; processing the detected oscillation of the mechanical structure in the second oscillation mode by a frequency depending on the excitation frequency or the oscillation frequency of the oscillation in the first oscillation mode; and determining the measured quantity to be measured on the basis of the processed oscillation of the mechanical structure in the second oscillation mode.
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52. A measuring device for determining a measured quantity, comprising:
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a mechanical oscillatory structure in which, via an oscillation signal, a mechanical oscillation of the mechanical structure is detectable; an exciter configured to excite the mechanical oscillatory structure by an excitation signal having a excitation frequency to result in the mechanical oscillatory structure mechanically oscillating with an oscillation frequency, the exciter being configured to regulate the excitation frequency, an excitation amplitude or an excitation phase of the excitation signal by a feedback branch via which the mechanical oscillation of the oscillatory structure is detectable, the oscillatory structure, the exciter and the feedback branch forming a resonance circuit oscillating at a self-resonance of the oscillatory structure; a sampler configured to sample the oscillation signal of the mechanical oscillatory structure at a sample frequency synchronized to the excitation signal; a digital filter configured to digitally filter the oscillation signal; and a evaluator configured to determine the measured quantity based on the filtered oscillation signal.
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53. A measuring device for determining a measured quantity, comprising:
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an oscillatory structure in which an oscillation signal is detectable; an exciter configured to excite the oscillatory structure by an excitation frequency to result in an oscillation with an oscillation frequency; a processor configured to process the oscillation signal synchronous to the oscillation frequency or the excitation frequency; and an evaluator configure to determine the measured quantity based on the processed oscillation signal, wherein the processor comprises a sampler configured to sample the oscillation signal of the oscillatory structure at a sample frequency synchronized to the oscillation frequency or the excitation frequency and comprises a digital filter having fixed filter tap coefficients so that a filter characteristic of the digital filter depends on the sample frequency.
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Specification