Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-11-20
1999-03-30
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, 310324, 310312, H01L 4108
Patent
active
058893512
ABSTRACT:
A viscosity measuring device is equipped with a piezo-electric vibrator, an oscillator and a loss factor monitoring means. The elastic properties of the piezo-electric vibrator and the viscous resistance of the fluid are controlled so that the tangent of loss factor of the piezo-electric vibrator may change largely enough to measure the viscosity. The characteristics measuring device is equipped with a first ceramic plate, a piezo-electric element sandwiched between a pair of electrodes attached to one surface of this first ceramic plate, a second ceramic plate having a hollow portion therein sintered integrally with the first ceramic plate, and a lid disposed so as to sandwich the second ceramic plate between the lid and the first ceramic plate and so as to face the other surface of the first ceramic plate. The amount of a glass component on the other surface of the first ceramic plate is regulated to be smaller than that of the glass component on the one surface of the first ceramic plate. The device for measuring the viscosity of a fluid can easily measure the viscosity with the good reproducibility even in the flowing fluid irrespective of the magnitude of the viscosity, and an element and a device for effectively measuring characteristics such as viscosity, concentration and density of an acidic solution or a basic solution is easily provided.
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Okumura Hidemasa
Shibata Kazuyoshi
Takeuchi Yukihisa
Budd Mark O.
NGK Insulators Ltd.
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