Method and device for detecting two parameters of a fluid
First Claim
1. A method for detecting a first and a second parameter of a fluid with a sensor apparatus including an oscillator, comprising:
- exciting the oscillator by an excitation signal of a primary oscillator;
exciting the oscillator via two parameters while the oscillator is in contact with the fluid, the first parameter of the fluid damping the excited oscillator via a first phase delay, and the second parameter damping the excited oscillator via a second phase delay;
detecting an oscillation signal of the excited and damped oscillator;
generating a first phase-shifted signal via a third phase delay from the excitation signal, the third phase delay equal to one of (a) the first phase delay and (b) the second phase delay;
mixing the oscillation signal with the first phase-shifted signal to generate a first mixed signal; and
averaging over time the first mixed signal to determine one of (a) the first parameter and (b) the second parameter of the fluid according to the third phase delay.
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Abstract
An oscillator is excited by a primary oscillator, and the excited oscillator is immersed in a fluid having two parameters, the first parameter of the fluid damping the excited oscillator via a first phase delay, and the second parameter damping the excited oscillator via a second phase delay. The oscillation of the excited and damped oscillator is detected as the oscillation signal. The oscillation signal is mixed with a phase-shifted signal generated from the excitation signal via a third phase delay which corresponds to either the first or the second phase delay. The mixed signal is averaged over time to determine the first or the second parameter according to the selection of the phase delay.
17 Citations
12 Claims
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1. A method for detecting a first and a second parameter of a fluid with a sensor apparatus including an oscillator, comprising:
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exciting the oscillator by an excitation signal of a primary oscillator;
exciting the oscillator via two parameters while the oscillator is in contact with the fluid, the first parameter of the fluid damping the excited oscillator via a first phase delay, and the second parameter damping the excited oscillator via a second phase delay;
detecting an oscillation signal of the excited and damped oscillator;
generating a first phase-shifted signal via a third phase delay from the excitation signal, the third phase delay equal to one of (a) the first phase delay and (b) the second phase delay;
mixing the oscillation signal with the first phase-shifted signal to generate a first mixed signal; and
averaging over time the first mixed signal to determine one of (a) the first parameter and (b) the second parameter of the fluid according to the third phase delay. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device, comprising:
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an oscillator connected to a primary oscillator to transmit an excitation signal of the primary oscillator to the oscillator;
a detection apparatus connected to sensor apparatus to detect an oscillation signal of an oscillating circuit;
a first delay unit arranged between a mixer apparatus and the primary oscillator to generate a third phase-shifted signal and supply the third phase-shifted signal to the mixer apparatus, which is connected to the sensor apparatus and is adapted to transmit first mixed signal to a first filter apparatus to average the first mixed signal over time. - View Dependent Claims (8, 9, 10, 11)
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12. A device for performing a method for detecting a first and a second parameter of a fluid with a sensor apparatus including an oscillator, comprising:
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means for exciting the oscillator by an excitation signal of a primary oscillator;
means for exciting the oscillator via two parameters while the oscillator is in contact with the fluid, the first parameter of the fluid damping the excited oscillator via a first phase delay, and the second parameter damping the excited oscillator via a second phase delay;
means for detecting an oscillation signal of the excited and damped oscillator;
means for generating a first phase-shifted signal via a third phase delay from the excitation signal, the third phase delay equal to one of (a) the first phase delay and (b) the second phase delay;
means for mixing the oscillation signal with the first phase-shifted signal to generate a first mixed signal; and
means for averaging over time the first mixed signal to determine one of (a) the first parameter and (b) the second parameter of the fluid according to the third phase delay.
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Specification