Measuring and testing – Specific gravity or density of liquid or solid
Patent
1992-04-10
1994-06-28
Williams, Hezron E.
Measuring and testing
Specific gravity or density of liquid or solid
73 5427, G01N 934, G01N 1116
Patent
active
053236386
ABSTRACT:
A sensor, for use in determining physical properties of fluid, comprises a flexible diaphragm having a plane. Two tines depend from the diaphragm substantially at right angles to the plane. First and second substantially planar transducers are each bonded to the diaphragm so that the plane of the transducers are parallel to that of the diaphragm. A first one of the transducers is operative, in use, to flex between in its plane and to couple an alternating driving force into the plane of the diaphragm such that the tines vibrate in an oscillatory motion. Second of the transducers is operative to detect vibrations of the diaphragm.
REFERENCES:
patent: 4922745 (1990-05-01), Rudin et al.
R. M. Langdon, "Vibratory Process Control Transducers", Marconi Review, vol. 43, No. 218 (Third Quarter 1980), pp. 156-175.
GEC--Marconi Limited
Roskos Joseph W.
Williams Hezron E.
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