Precise shear-stress measurement apparatus

Details Precise shear-stress measurement apparatus Precise shear-stress measurement apparatus

1997-01-16

1998-01-06

Chilcot, Richard

Measuring and testing

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

Viscosity

73 5401, G01N 1110

Patent

active

057057389

ABSTRACT:
A precise shear-stress measurement apparatus includes a spring disposed perpendicularly to a sample surface, and a cylindrical piezoelectric element disposed perpendicularly to the sample surface and connected to the spring. The piezoelectric element is circumferentially divided into a plurality of pieces. The apparatus further includes a circuit for driving the piezoelectric element, a capacitance-type displacement gauge for detecting a horizontal displacement of the spring, and a battery for driving the displacement gauge. This reduces noise from an electric system, thereby making it possible to precisely measure even rheology motion in a very small space on the order of nanometers.

REFERENCES:
patent: 4896339 (1990-01-01), Fukumoto
patent: 5094100 (1992-03-01), Dealy et al.
patent: 5163317 (1992-11-01), Ono et al.

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