System for controlled acoustic rotation of objects

Details System for controlled acoustic rotation of objects System for controlled acoustic rotation of objects

1981-09-18

1983-07-19

Gill, James J.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

60721, H02N 1100

Patent

active

043937063

ABSTRACT:
A system is described for use with acoustically levitated objects, which enables close control of rotation of the object. One system includes transducers (18, 20, 22) that propagate acoustic waves along the three dimensions (X, Y, Z) of a chamber (16) of rectangular cross section. Each transducer generates a first wave which is resonant to a corresponding chamber dimension to acoustically levitate an object, and additional higher frequency resonant wavelengths for controlling rotation of the object. The three chamber dimensions and the corresponding three levitation modes (resonant wavelengths) are all different, to avoid degeneracy, or interference, of waves with one another, that could have an effect on object rotation. Only the higher frequencies, with pairs of them (e.g. 50, 52) having the same wavelength, are utilized to control rotation, so that rotation is controlled independently of levitation and about any arbitrarily chosen axis.

REFERENCES:
patent: 3232120 (1966-02-01), Ensley
patent: 3882732 (1975-05-01), Fletcher
patent: 4139806 (1979-02-01), Kanber et al.

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