Methods and apparatus for determining properties of a fluid
First Claim
1. A method for determining viscosity of a fluid comprising:
- interacting the fluid with a standing wave in a first state to establish the standing wave in a second state;
analyzing an electric signal associated with the standing wave to determine a characteristic associated with the second state, wherein the characteristic comprises at least one of a maximum phase slope of at least a part of the electric signal, a phase slope associated with a resonant frequency, or both; and
determining the viscosity of the fluid by comparing the characteristic associated with the second state with a function that associates a plurality of viscosities with a corresponding plurality of characteristics.
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Abstract
A method and system for determining properties of a fluid involves interacting the fluid with a standing wave in a first state to establish the standing wave in a second state, analyzing an electric signal associated with the standing wave to determine a characteristic associated with the second state, and determining the property of the fluid by comparing the characteristic with a function that associates a plurality of properties with a corresponding plurality of characteristics. The characteristic can include a maximum phase slope, a phase slope associated with a resonant frequency, a maximum magnitude associated with the resonant frequency, the value of the resonant frequency, or any combination thereof.
118 Citations
22 Claims
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1. A method for determining viscosity of a fluid comprising:
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interacting the fluid with a standing wave in a first state to establish the standing wave in a second state; analyzing an electric signal associated with the standing wave to determine a characteristic associated with the second state, wherein the characteristic comprises at least one of a maximum phase slope of at least a part of the electric signal, a phase slope associated with a resonant frequency, or both; and determining the viscosity of the fluid by comparing the characteristic associated with the second state with a function that associates a plurality of viscosities with a corresponding plurality of characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for determining viscosity of a fluid comprising:
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interacting the fluid with a standing wave in a first state to establish the standing wave in a second state, wherein a wave speed associated with the standing wave is less than the speed of sound in the fluid; analyzing an electric signal associated with the standing wave to determine a characteristic associated with the second state, wherein the characteristic comprises a maximum magnitude of at least a part of the electric signal associated with a resonant frequency of the electric signal; and determining viscosity of the fluid by comparing the characteristic associated with the second state with a function that associates a plurality of viscosities with a corresponding plurality of characteristics. - View Dependent Claims (16, 17)
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18. A method for determining density of a fluid comprising:
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interacting the fluid with a standing wave in a first state to establish the standing wave in a second state; analyzing an electric signal associated with the standing wave to determine a resonant frequency associated with the second state; and determining density of the fluid by comparing the resonant frequency with a function that associates a plurality of densities with a corresponding plurality of resonant frequencies. - View Dependent Claims (19, 20, 21)
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22. An apparatus for determining viscosity of a fluid, the device comprising:
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a means for interacting a fluid with a standing wave in a first state to establish the standing wave in a second state; a means for analyzing an electric signal associated with the standing wave to determine a characteristic associated with the second state, wherein the characteristic comprises at least one of a maximum phase slope, a phase slope associated with a resonant frequency, or both; a means for determining viscosity of the fluid by comparing the characteristic associated with the second state with a function that associates a plurality of viscosities with a corresponding plurality of characteristics.
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Specification