Acoustic controlled rotation and orientation

Details Acoustic controlled rotation and orientation Acoustic controlled rotation and orientation

1986-10-29

1989-01-31

Chapman, John

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

73571, G10K 1500, G01B 1700

Patent

active

048007560

ABSTRACT:
Acoustic energy is applied to a pair of locations spaced about a chamber, to control rotation of an object levitated in the chamber. Two acoustic transducers applying energy of a single acoustic mode, one at each location, can (one or both) serve to levitate the object in three dimensions as well as control its rotation. Slow rotation is achieved by initially establishing a large phase difference and/or pressure ratio of the acoustic waves, which is sufficient to turn the object by more than 45.degree., which is immediately followed by reducing the phase difference and/or pressure ratio to maintain slow rotation. A small phase difference and/or pressure ratio enables control of the angular orientation of the object without rotating it. The sphericity of an object can be measured by its response to the acoustic energy.

REFERENCES:
patent: 3882732 (1975-05-01), Wang et al.
patent: 4139806 (1979-02-01), Kanber et al.
patent: 4393706 (1983-07-01), Barmatz
patent: 4420977 (1983-12-01), Elleman et al.
patent: 4475921 (1984-10-01), Barmatz
patent: 4573356 (1986-03-01), Barmatz et al.
patent: 4716764 (1988-01-01), Felix

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