Method for measuring the viscosity of a material

Details Method for measuring the viscosity of a material Method for measuring the viscosity of a material

1991-11-27

1993-02-16

Williams, Hezron E.

Measuring and testing

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

Viscosity

G01N 1100

Patent

active

051860406

ABSTRACT:
A method for measuring the viscosity of a material consists in forming an array of parallel strips of material for constituting a diffraction grating; illuminating the array with a monochromatic light beam which produces a diffraction grating comprised of a main light spot (5) and of a plurality of adjacent diffraction spots, the envelope of which exhibits a major lobe (LO) including the main spot (5) and minor lobes (L1, L2); subjecting the array to a thermal process consisting in rapidly heating it at a predetermined temperature (T) and maintaining it at such temperature; selecting the brightest spot (6) among those of the first lobe (L1) and measuring the evolution of its light intensity (HL1) during the thermal process; determining the time interval elapsing until the first passage by a minimum intensity value (HL1b) of the spot (6); and deducting therefrom the value (.nu.) of the viscosity of the material constituting the array by the formula 1/.nu.=.alpha.d.

REFERENCES:
patent: 4188123 (1980-02-01), Kleinknecht
patent: 4813781 (1989-03-01), Tissier et al.
A. Tissier et al., "Glass Reflow Modeling for Process Optimization", Proceedngs of the 17th European Solid State Device Research Conference, Sep., 1987, pp. 431-434.
A. Tissier et al, "An Optical Method for In-Line Glass Flow Control", Proceedings of the SPIE, vol. 1012, Sep. 1988, pp. 186-193.

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