Method and apparatus for determining diameter and wall thickness of minute hollow spherical shells
US4308750A · kind A · utility
1Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 1980 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | May 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.