Instrument for measuring static and dynamic forces between surfa

Details Instrument for measuring static and dynamic forces between surfa Instrument for measuring static and dynamic forces between surfa

1996-10-10

1999-01-19

Noland, Thomas P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

73862632, G01L 100, G01N 1300, G01B 902, G01B 1116

Patent

active

058619542

ABSTRACT:
A surface forces measuring apparatus (SFA) including miniature rheometers and friction measuring devices. Both static (i.e., equilibrium) forces and dynamic (e.g., time-dependent such as viscous, hysteretic and frictional) forces can be measured between two surfaces in relative motion to each other along the z-direction (normally) or the x- or y-directions (horizontally), or along any desired direction in 3D space. The new instrument uses a novel combination of piezoelectric tubes and N-type bimorphs, and a three-stage mechanical mechanism to produce linear motion of one of the surfaces along any desired direction, and a combination of an optical technique and semi-conductor strain-gauges allows for the force produced on the other surface to be directly measured, also in any direction (which may be in a different direction from that of the first surface which generates the force). Force measuring sensitivity is significantly higher, both in magnitude and time-response, than in previous force-measuring devices, particularly in the x- and y-directions, enabling weaker forces and rapid transient effects to be studied in detail.

REFERENCES:
patent: 3796494 (1974-03-01), Takabayashi
patent: 3870414 (1975-03-01), Duffy
patent: 4050818 (1977-09-01), Sharpe, Jr. et al.
patent: 5164791 (1992-11-01), Aubo et al.
patent: 5193383 (1993-03-01), Burnham et al.
patent: 5572233 (1996-11-01), Kuda et al.

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