Charles T Gebert

US Patent:

57419612, Apr 21, 1998

Filed:

Aug 18, 1993

Appl. No.:

8/108397

Inventors:

Stephen J. Martin - Albuquerque NM
James J. Wiczer - Albuquerque NM
Richard W. Cernosek - Albuquerque NM
Gregory C. Frye - Cedar Crest NM
Charles T. Gebert - Albuquerque NM
Leonard Casaus - Bernalillo NM
Mary A. Mitchell - Tijeras NM

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G01N 900

US Classification:

73 32R

Abstract:

A pair of thickness-shear mode resonators, one smooth and one with a textured surface, allows fluid density and viscosity to be independently resolved. A textured surface, either randomly rough or regularly patterned, leads to trapping of liquid at the device surface. The synchronous motion of this trapped liquid with the oscillating device surface allows the device to weigh the liquid; this leads to an additional response that depends on liquid density. This additional response enables a pair of devices, one smooth and one textured, to independently resolve liquid density and viscosity; the difference in responses determines the density while the smooth device determines the density-viscosity product, and thus, the pair determines both density and viscosity.

US Patent:

57984522, Aug 25, 1998

Filed:

Apr 25, 1997

Appl. No.:

8/846085

Inventors:

Stephen J. Martin - Albuquerque NM
James J. Wiczer - Albuquerque NM
Richard W. Cernosek - Albuquerque NM
Gregory C. Frye - Cedar Crest NM
Charles T. Gebert - Albuquerque NM
Leonard Casaus - Bernalillo NM
Mary A. Mitchell - Tijeras NM

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G01N 900

US Classification:

73 32R

Abstract:

A pair of thickness-shear mode resonators, one smooth and one with a textured surface, allows fluid density and viscosity to be independently resolved. A textured surface, either randomly rough or regularly patterned, leads to trapping of liquid at the device surface. The synchronous motion of this trapped liquid with the oscillating device surface allows the device to weigh the liquid; this leads to an additional response that depends on liquid density. This additional response enables a pair of devices, one smooth and one textured, to independently resolve liquid density and viscosity; the difference in responses determines the density while the smooth device determines the density-viscosity product, and thus, the pair determines both density and viscosity.