Acoustic rotation control
US4420977A · kind A · utility
10Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N11/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system is described for acoustically controlled rotation of a levitated object (12), which avoids deformation of a levitated liquid object. Acoustic waves (50, 52 in FIG. 6) of the same wavelength are directed along perpendicular directions across the object, and with the relative phases of the acoustic waves repeatedly switched so that one wave alternately leads and lags the other by 90.degree.. The amount of torque for rotating the object, and the direction of rotation, are controlled by controlling the proportion of time one wave leads the other and selecting which wave leads the other most of the time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.