Rheometer

Details Rheometer Rheometer

2007-03-27

2007-03-27

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

Reexamination Certificate

active

10523917

ABSTRACT:
A rheometer and method of making rheological measurements is disclosed, in which a sample is supported between plates and an alternating movement is applied by a driver, support rod and plate. Force and displacement measurements are taken and the property determined from those measurements. The vibrating signal which is applied is in the form of a frequency sweep signal having a monotonic group delay function. The top plate is provided with a surface which causes a meniscus to form up a side edge of the plate to reduce the spring nature of the sample when the movement is supplied to the sample, and a supporting rod which supports the top plate is preferably formed from a material having a low coefficient of thermal expansion so that the gap between the plates is maintained substantially constant if the sample is heated to take measurements at different temperatures.

REFERENCES:
patent: 3933032 (1976-01-01), Tschoegl
patent: 5750884 (1998-05-01), Field
patent: 2002/0178795 (2002-12-01), Isogai et al.
patent: 2 806 804 (2001-09-01), None
patent: WO 90/08309 (1990-07-01), None
patent: WO 02/086462 (2002-10-01), None

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