Multi-tuned acoustic cylindrical projector
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorRobert J. Obara
Life of this patent
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Abstract
A system and method for operating a cylindrical acoustic projector is provided which allows efficient operation of the projector over a wide bandwidth. The system and method use multiple power amplifiers each tuned to operate over separate and narrow bandwidths, the number of seperate bandwidths corresponding to the number of amplifiers such that the total bandwidth is covered. Each tuning network assembly includes the power amplifier, a transformer and a tuning inductor, with the tuning inductor selected for proper tuning over the frequency bands the amplifier is to operate at. The narrow bandwidths for each power amplifier result in a substantial reduction in the reactive power dissipated in the amplifiers and also the total power consumption of the acoustic projector.
Claims8
An operating system for a wide bandwidth cylindrical acoustic projector having a plurality of electrically conductive elements spaced circumferentially about the projector the system comprising:
- a plurality of signal amplifiers, each amplifier providing a signal corresponding to a separate portion of the bandwidth of the acoustic projector, the total of the signals corresponding to the total bandwidth;
- and
- a plurality of tuning means, each tuning means associated with one of the amplifiers, each tuning means receiving the signal from the one amplifier, providing a tuned voltage corresponding to the signal and applying the tuned voltage across a separate portion of the acoustic projector between adjacent conductive elements, the portions of the acoustic projector forming the complete acoustic projector.
A method for operating a wide bandwidth cylindrical acoustic projector, the method comprising the steps of:
- providing a cylindrical acoustic projector;
- determining a number of tuning bands;
- dividing the bandwidth into bandwidth portions corresponding to the number of tuning bands;
- dividing the acoustic projector into sub-elements using electrically conductive elements, the number of sub-elements corresponding to the number of tuning bands;
- and,
- applying a voltage across each sub-element, the voltage across each sub-element separately tuned to a center of one of the bandwidth portions.
Dependencies are inferred from the claim text.