Apparatus and methods of tuning and amplifying piezoelectric sonic and ultrasonic outputs

Patent metadata

Field	Value
Publication number	US-9321081-B2
Application number	US-201313851336-A
Country	US
Kind code	B2
Filing date	Mar 27, 2013
Priority date	Jul 27, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

An apparatus and method associated with amplifying piezoelectric sonic and ultrasonic outputs is presented which provides high power output from piezoelectric devices, especially at high ultrasonic frequencies, in open air, which mitigates or eliminates overheating of the piezoelectric devices when stimulated at or near their peak outputs for extended periods. In addition, the invention provides a means of amplifying a piezoelectric sonic and ultrasonic device if a desired output power exceeds a normal maximum capability of the piezoelectric device.

First claim

The invention claimed is:

1. An energy output apparatus assembly adapted for amplifying and controlling a plurality of piezoelectric devices comprising
a plurality of piezoelectric devices;
a plurality of heat conductive structures; and
a plurality of time delay devices coupled to at least some of said plurality of piezoelectric devices;
wherein said plurality of piezoelectric devices are adapted to propagate a piezoelectric effect along a propagation path, said devices comprising a front device, a back device, and intervening devices disposed between said front and back device;
wherein said plurality of heat conductive structures are thermo coupled and sonic coupled between sides of said plurality of said devices, said heat conductive structures are operable as heat sinks adapted to dissipate thermal energy from portions of said devices, each of the heat conductive structures are sized to resonate at a predetermined or an operating frequency of each of the devices a respective said heat conductive structure is coupled with on one side, said devices are stacked such as a propagation side of said devices are oriented along an axis defined by a propagation path;
wherein said assembly is adapted to produce said piezoelectric effect comprising an energy output of the devices which is directionally oriented or focused such that a phasing of each individual device produces a combined wavefront along said propagation path of said assembly that results in additive phasing of said energy output, wherein each of said time delay devices are adapted to control said energy output of said devices to further provide said additive phasing of said wavefront for each device as said energy output of the devices travels along said propagation path at or in front of the front device;
wherein each of said heat conductive structures is formed with a parabolic curvature of each structure;
wherein said each of said heat conductive structures has an increasing radius as compared to an adjacent said structure along a progression of said structures along said propagation path from said front device while each structure further has a different thickness from adjacent structures, each thickness is determined based on a thickness required to maintain its resonance so as to ensure said combined wavefront is maintained.

2. An apparatus as in claim 1 , wherein said back device is sonic insulated from sonic influences outside of said assembly.

3. An apparatus as in claim 1 , wherein said combined wavefront phase can be static, dynamic open or closed loop.

4. An apparatus as in claim 1 , wherein structures and devices are adapted to emit directional transmission of said energy output that is focused at infinity, a point along said propagation path, or in a fan beam at an angle to said propagation path as determined by a shape of one or more said structures.

5. An apparatus as in claim 1 , wherein said structures comprise round structures adapted with parabolic contours of increasing diameter along said propagation axis from said front device to said back device to provide focus of said energy output.

6. An apparatus as in claim 1 , wherein said structures comprise an oval shape to provide a plurality of resonant frequencies of said energy output.

7. An apparatus as in claim 1 , wherein said structures comprise a complex shape to provide multiple resonances.

8. An apparatus as in claim 1 , wherein said structures comprise flat structures to provide directional transmission without focus of said energy output.

9. An apparatus as in claim 1 , wherein said structures thickness is determined based on a speed of sound in a material comprising said structure, a thickness of said structure, and a diameter of said structure if said structure is circular or a length and width if said structure is not circular.

10. An apparatus as in claim 1 , further comprising a controller adapted to control said devices, said controller is electrically coupled to said devices, said apparatus further comprising said structures formed with actuator materials which are adapted to change at least one part of a shape of said structures based on application of electric, heat, mechanical forces, or other stimuli in order to adjust the focus or shape sonic or ultrasonic waves being transited through the structures.

11. An apparatus as in claim 1 , further comprising a housing adapted to house said assembly.

12. An apparatus as in claim 1 , wherein said assembly is formed as part of an ultrasonic device.

13. An apparatus as in claim 1 , wherein said devices are directionally focused.

14. An apparatus as in claim 1 , wherein said structures are adapted to resonate at a predetermined said energy output of said devices.

15. An energy output apparatus comprising
an assembly adapted for amplifying sonic or ultrasonic outputs from comprising a housing, controller, a plurality of piezoelectric devices, a plurality of time delay devices coupled to at least some of said plurality of piezoelectric devices, and a plurality of heat conductive structures, wherein said controller is adapted to control said devices and said time delay devices, said controller is electrically coupled to said devices;
wherein said plurality of piezoelectric devices are adapted to propagate a piezoelectric effect along a propagation path, said devices comprising a front device, a back device, and intervening devices;
wherein said plurality of heat conductive structures are thermo coupled and sonic coupled between sides of said plurality of said devices, said heat conductive structures are operable as heat sinks adapted to dissipate thermal energy from portions of said devices, each of the heat conductive structures are sized to resonate at a predetermined or an operating frequency, a heat conductive structure is coupled with of each of the devices on one side, said devices are stacked such that the propagation side of said devices are oriented along an axis defined by a propagation path;
wherein said assembly is adapted to produce said piezoelectric effect comprising an energy output of the devices which is directionally oriented or focused such that a phasing of each individual device produces a combined wavefront along said propagation path of said assembly that results in additive phasing of said energy output, wherein each of said time delay devices are adapted to control said energy output of said devices to further provide said additive phasing of said wavefront for each device as said energy output of the devices travels along said propagation path at or in front of the front device;
wherein each of said heat conductive structures are formed with a parabolic curvature of each structure;
wherein each of said heat conductive structures has an increasing radius as compared to an adjacent said structure along a progression of said structures along said propagation path from said front device while each structure further has a different thickness from adjacent structures, each thickness is determined based on a thickness required to maintain its resonance so as to ensure said combined wavefront is maintained;
wherein said back device is sonic insulated from sonic influences outside of said assembly;
wherein said combined wavefront phase can be static, dynamic open or closed loop;
wherein structures and devices are adapted to emit directional transmission of said energy output that is focused at infinity, a point along said propagation path, or in a fan beam at an angle to said propagation path as determined by a shape of one or more said structures;
wherein said structures thickness is determined based on a speed

Assignees

• Whitaker George
• Us Navy

Inventors

• Whitaker George

Classifications

• B06B2201/71

  Cleaning in a tank · CPC title

• B06B1/0207 Primary

  Driving circuits (specially adapted for particular applications, see the relevant subclass, e.g. G01; circuits for steering transducer arrays G10K11/34; basic circuits H03) · CPC title

• B06B1/0618

  of piezo- and non-piezoelectric elements, e.g. 'Tonpilz' · CPC title

• B06B2201/20

  Application to multi-element transducer · CPC title

• B06B1/06 Primary

  operating with piezoelectric effect or with electrostriction (piezoelectric or electrostrictive devices per se H10N30/00) · CPC title