Method and apparatus for measuring viscosity in a liquid utilizing a piezoelectric sensor
First Claim
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1. An apparatus for measuring the viscosity of liquids comprising:
- piezoelectric means containing a thickness shear mode crystal with opposing major surfaces, opposing electrodes mounted on said major surfaces and lead wires correspondingly connected to said electrodes for suspending said thickness shear mode crystal and conveying electrical drive energy to said electrodes;
energization means for supplying AC electrical drive energy to said piezoelectric means; and
detection means for monitoring electrical characteristics of said piezoelectric means when driven by said energization means.
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Abstract
A piezoelectric element energized to exhibit thickness-shear mode vibration is utilized to measure the viscosity of liquids. Electrodes, of an inert material are bonded to the major faces of the disc shaped crystal and are of a lesser diameter than the crystal surfaces so as to provide a concentric ring area of the crystal that is unenergized.
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Citations
11 Claims
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1. An apparatus for measuring the viscosity of liquids comprising:
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piezoelectric means containing a thickness shear mode crystal with opposing major surfaces, opposing electrodes mounted on said major surfaces and lead wires correspondingly connected to said electrodes for suspending said thickness shear mode crystal and conveying electrical drive energy to said electrodes; energization means for supplying AC electrical drive energy to said piezoelectric means; and detection means for monitoring electrical characteristics of said piezoelectric means when driven by said energization means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for measuring the viscosity of liquids comprising:
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providing piezoelectric means containing a thickness shear mode crystal with opposing major surfaces, opposing electrodes mounted on said major surfaces and lead wires correspondingly connected to said electrodes for suspending said thickness shear mode crystal and conveying electrical drive energy to said electrodes; providing energization means for supplying AC electrical drive energy to said piezoelectric means; and providing detection means for monitoring electrical characteristics of said piezoelectric means when driven by said energization means. - View Dependent Claims (8, 9, 10, 11)
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Specification