Method and apparatus for determining diameter and wall thickness

Details Method and apparatus for determining diameter and wall thickness Method and apparatus for determining diameter and wall thickness

1980-05-30

1982-01-05

Ruehl, Charles A.

Measuring and testing

Miscellaneous

73 57, 250578, G01N 1502, G01N 2185

Patent

active

043087507

ABSTRACT:
Method and apparatus for determining diameter and wall thickness of hollow microspheres or shells wherein terminal velocities of shells traveling in fluid-filled conduits of differing diameters are measured. A wall-effect factor is determined as a ratio of the terminal velocities, and shell outside diameter may then be ascertained as a predetermined empirical function of wall-effect factor. For shells of known outside diameter, wall thickness may then be ascertained as a predetermined empirical function of terminal velocity in either conduit.

REFERENCES:
patent: 2949027 (1960-08-01), Eolkin
patent: 3763428 (1973-10-01), Preist
patent: 4196353 (1980-04-01), Singleton
Francis; A. W., Wall Effect in Falling Ball Method for Viscosity, Physics, vol. 4, pp. 403-406, Nov. 1933.

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