Piezo-rheometric measuring cell and corresponding piezo-rheometer
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United States of America Patent
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Aug 31, 2010
Grant Date -
Oct 2, 2008
app pub date -
Jul 21, 2005
filing date -
Jul 22, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a piezo-rheometric measuring cell for shear or compression measurement, essentially comprising two sample holder plates, with the sample for analysis between the same in solid, liquid or intermediate form, piezoelectric ceramic elements on the faces of the plates opposite to the faces in contact with the sample and a construction forming the housing and compressing the arrangement of plates and ceramic elements, one or more ceramics called emitter, being connected to one of the two plates or the emitter plate and subjecting the same to shear or compression vibrations by means of an excitation signal and one or more ceramics, called receiver, being connected to the other plate or receiver plate and converting the forces to which the same is subject into a measured signal. The cell is characterized in that the emitter and receiver cell(s) are arranged such that the respective polarizations of the emitter ceramic (4) and the receiver ceramic (4'), or the respective resultant polarizations of the emitter ceramics (4) and the receiver ceramics (4') are parallel and in the same direction. Said cell (1) is preferably portable and permits measurements with variation in temperature and/or pressure.
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