System for controlled acoustic rotation of objects

Apparatus for levitating an object and closely controlling its rotation, comprising:

• walls defining a chamber having a width, length and height;
• first transducer means for propagating acoustic waves along the width of said chamber, including waves of a first wavelength and also waves of a second wavelength that is shorter than said first wavelength and with said first and second wavelengths both resonant to the width of the chamber;
• second transducer means for propagating acoustic waves along the length of said chamber, including waves of a third wavelength and also waves of a fourth wavelength that is shorter than said third wavelength and with said third and fourth wavelengths both resonant to the length of the chamber;
• and
• means for controlling the position of said object along the height of said chamber;
• said chamber width and length and said wavelengths being chosen, so that said first and third wavelengths are different while said second and fourth wavelengths are substantially the same, whereby the first and third wavelength modes levitate the object and the degenerate second and fourth wavelength modes control object rotation.

Apparatus for levitating an object and controlling its rotation, comprising:

• walls forming a substantially parallelepiped chamber having a width, length and height;
• means for propagating resonant acoustic waves in said chamber, including waves of three different wavelengths along the width, waves of three different wavelengths along the length, and waves of three different wavelengths along the height;
• a first of the wavelengths along the width, length, and height all being considerably different, so that they do not tend to rotate the object;
• a second of the wavelengths along the width and length being substantially the same to control rotation of the object about a first axis extending along the height;
• a third wavelength along the width and a second wavelength along the height being substantially the same, to control rotation of the object about a second axis extending along the length;
• and
• a third wavelength along the length and a third wavelength along the height being substantially the same to control rotation of the object about a third axis extending along the width.

Apparatus for levitating an object and closely controlling its rotation, comprising:

• walls defining a chamber substantially in the form of a parallelepiped having a width, length and height;
• first transducer means for propagating acoustic waves along the width of said chamber, including waves of a first wavelength and also waves of a second wavelength that is shorter than said first wavelength and with said first and second wavelengths both resonant to the width of the chamber;
• second transducer means for propagating acoustic waves along the length of said chamber, including waves of a third wavelength and also waves of a fourth wavelength that is shorter than said third wavelength and with said third and fourth wavelengths both resonant to the length of the chamber;
• and
• said chamber width and length and said wavelengths being chosen, so that said first and third wavelengths are different while said second and fourth wavelengths are substantially the same, whereby the first and third wavelength modes levitate the object and the degenerate second and fourth wavelength modes control object rotation;
• said first transducer means also producing waves of a fifth wavelength along the chamber width, and including third transducer means for propagating resonant acoustic waves along the height of said chamber, including waves of a sixth wavelength which is different from said first and third wavelengths, and waves of a seventh wavelength that is substantially the same as said fifth wavelength.