CPC H01J 23/18 (2013.01) [G10K 11/172 (2013.01); H01J 25/58 (2013.01)] | 20 Claims |
1. A variable-frequency, curved tube acoustic resonator comprising:
a side wall forming a tube defining a cylindrical resonance chamber and having an open end configured to receive an incident acoustic wave, and a distal end opposite the open end, the tube defining a curvilinear axis extending along the middle of the resonance chamber from the open end to the distal end, the curvilinear axis having at least one curved region;
a sphere comprising a ferromagnetic material positioned within the tube, defining an end wall, the sphere movable along the curvilinear axis to vary a resonance frequency of the resonator; and
an external magnetic element configured to move and impel a corresponding movement of the sphere.
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14. A variable-frequency, curved tube acoustic resonator comprising:
a side wall forming a tube defining a cylindrical resonance chamber and having an open end configured to receive an incident acoustic wave, and a distal end opposite the open end, the tube defining a curvilinear axis extending along the middle of the resonance chamber from the open end to the distal end, the curvilinear axis having a helical shape; and
a sphere positioned within the tube, defining an end wall, the sphere movable along the curvilinear axis to vary a resonance frequency of the resonator.
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