Acoustic viscometer and method of determining kinematic viscosity and intrinsic viscosity by propagation of shear waves
First Claim
1. An acoustic viscometer for determining both the kinematic viscosity and the intrinsic viscosity of a liquid comprising:
- an acoustic wave generator;
a transmitting piezoelectric transducer operably connected to the acoustic wave generator and positioned so as to be in contact with the liquid so as to propagate a longitudinal wave of known frequency through the liquid;
a receiving piezoelectric transducer, spaced apart from the transmitting piezoelectric transducer and in contact with liquid, so as to detect the longitudinal, wave and a corresponding shear wave propagated through the liquid in terms of liquid density; and
a phase-shift detector operably connected to the transmitting piezoelectric transducer and the receiving piezoelectric transducer to measure a difference in phase between the longitudinal wave propagated by the transmitting piezoelectric transducer and the longitudinal and shear wave detected by the receiving piezoelectric transducer, the difference in phase used to determine the velocity of the shear wave, and the kinematic viscosity and the intrinsic viscosity of the liquid in terms of liquid density.
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Accused Products
Abstract
An acoustic viscometer and method for determining both the kinematic viscosity and the intrinsic viscosity of a liquid which includes an acoustic wave generator, a transmitting piezoelectric transducer, a receiving piezoelectric transducer, and a phase-shift detector. The transmitting piezoelectric transducer is positioned so as to be in contact with the liquid and is operably connected to the acoustic wave generator. The transmitting piezoelectric transducer propagates a longitudinal wave of known frequency through the liquid. The receiving piezoelectric transducer is spaced apart from the transmitting piezoelectric transducer and detects the longitudinal wave and a corresponding shear wave propagated through the liquid. The phase-shift detector is operably connected to both the transmitting and receiving piezoelectric transducers and measures the difference in phase between the longitudinal wave propagated by the transmitting piezoelectric transducer and the longitudinal and shear wave detected by the receiving piezoelectric transducer. The difference in phase is used to determine the velocity of the shear wave, and the kinematic and intrinsic viscosities of the liquid in terms of liquid density.
32 Citations
23 Claims
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1. An acoustic viscometer for determining both the kinematic viscosity and the intrinsic viscosity of a liquid comprising:
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an acoustic wave generator;
a transmitting piezoelectric transducer operably connected to the acoustic wave generator and positioned so as to be in contact with the liquid so as to propagate a longitudinal wave of known frequency through the liquid;
a receiving piezoelectric transducer, spaced apart from the transmitting piezoelectric transducer and in contact with liquid, so as to detect the longitudinal, wave and a corresponding shear wave propagated through the liquid in terms of liquid density; and
a phase-shift detector operably connected to the transmitting piezoelectric transducer and the receiving piezoelectric transducer to measure a difference in phase between the longitudinal wave propagated by the transmitting piezoelectric transducer and the longitudinal and shear wave detected by the receiving piezoelectric transducer, the difference in phase used to determine the velocity of the shear wave, and the kinematic viscosity and the intrinsic viscosity of the liquid in terms of liquid density. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
a phase-to-voltage convector operably connected to the phase-shift detector to convert the difference in phase between the longitudinal wave propagated by the transmitting piezoelectric transducer and the longitudinal and shear wave detected by the receiving piezoelectric transducer to a voltage; and
an output device operably connected to the phase-to-voltage convector for displaying a value corresponding to the voltage.
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15. A method for determining both the kinematic viscosity and the intrinsic viscosity of a liquid comprising:
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placing a transmitting piezoelectric transducer and a receiving piezoelectric transducer in contact with the liquid;
propagating a longitudinal wave and a corresponding shear wave in the liquid by vibrating the transmitting piezoelectric transducer;
detecting the longitudinal and shear wave With the receiving piezoelectric transducer;
determining a difference in phase between the longitudinal wave propagated by the transmitting piezoelectric transducer and the longitudinal and shear wave detected by the receiving piezoelectric transducer; and
determining a velocity of the shear wave, and the kinematic viscosity and the intrinsic viscosity of the liquid in terms of liquid density. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
converting the difference in phase between the longitudinal wave propagated by the transmitting piezoelectric transducer and the longitudinal and shear wave detected by the receiving piezoelectric transducer to a voltage; and
transmitting the voltage to an output device for displaying a value corresponding to the voltage.
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Specification