System and method for optimizing the design of an ultrasonic transducer

• US 9,117,038 B2
• Filed: 10/01/2012
• Issued: 08/25/2015
• Est. Priority Date: 07/27/2004
• Status: Active Grant

• Current Assignee: Vincent Lupien
• Original Assignee: Vincent Lupien
• Inventors: Lupien, Vincent
• Primary Examiner(s): Thangavelu, Kandasamy
• Application Number:
  US13/633,120
• Publication Number:
  US 20130116982A1
• Time in Patent Office: 1,058 Days
• US Class Current: 1/1
• CPC Class Codes: B06B 1/02 making use of electrical energy B06B1/18, B06B1/20 take precedence
• CPC Class Codes: G01N 2203/0658 using acoustic or ultrasonic detectors
• CPC Class Codes: G01N 29/00 Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object G01N3/00, G01N5/00, G01N7/00, G01N9/00, G01N11/00, G01N13/00, G01N15/00, G01N17/00, G01N19/00, G01N21/00, G01N22/00, G01N23/00, G01N24/00, G01N25/00, G01N27/00 take precedence
• CPC Class Codes: G01N 29/34 Generating the ultrasonic, sonic or infrasonic waves , e.g. electronic circuits specially adapted therefor
• CPC Class Codes: G03H 3/00 Holographic processes or apparatus using ultrasonic, sonic or infrasonic waves for obtaining holograms; Processes or apparatus for obtaining an optical image from them G03H1/22 takes precedence; acoustic non-destructive testing using holographic methods G01N29/0663; seismology using acoustic vibrations G01V1/00; non-holographic methods for visualizing acoustic waves G10K15/00
• CPC Class Codes: G06F 30/00 Computer-aided design [CAD]

Abstract

A system and method for determining optimal values for the geometrical features of an ultrasonic transducer having one or more elements, the method including backprojection ray-tracing to determine the parameters required for apertures located on an ultrasonic probe surface. The ultrasonic probe design system includes an interface for inputting statement parameters, insonification requirements, and geometric constraints, with an engine responsive to the interface and configured to determine and provide an optimized transducer geometric design output.

Claims

1. A system for providing a Geometrical Design for a component in an ultrasonic insonification system, said system comprising:

an interface for inputting (i) a Basic Problem Statement related to the operating media of the ultrasonic insonification system, (ii) at least one Insonification Requirement of the ultrasonic insonification system, (iii) at least one component Optimization Attribute; and

an engine responsive to said interface, said engine including means for computing a numerical value for said at least one component Optimization Attribute, wherein an optimized Geometrical Design for the component corresponds to the most desirable said numerical value of said at least one component Optimization Attribute.

2. The system of claim 1 wherein the component comprises a member of the group consisting of:

an ultrasonic transducer, an acoustic lens, and an acoustic mirror.

3. The system of claim 2 wherein said Geometrical Design includes at least one of:

(i) the shape of the component, (ii) the boundary of the component, (iii) the position of the component, (iv) the orientation of the component, (v) the number of transducer elements in said ultrasonic transducer, (vi) the shape of a said transducer element in said ultrasonic transducer, (vii) the size of a said transducer element in said ultrasonic transducer, (viii) the position of a said transducer element in said ultrasonic transducer, (ix) the orientation of a said transducer element in said ultrasonic transducer, and (x) the profile of the component.

4. The system of claim 2 wherein said component Optimization Attribute comprises a member of the group consisting of:

(i) the number of transducer elements in said ultrasonic transducer, (ii) the size of said ultrasonic transducer, and (iii) the size of a said transducer element in said ultrasonic transducer.

5. The system of claim 2 in which said engine is programmed to:

define an aperture on a surface of said ultrasonic transducer for each said at least one Insonification Requirement;

calculate phase and amplitude values at specified points of said aperture such that each said at least one Insonification Requirement is met by ultrasonic energy having said calculated phase and amplitude values at respective said specified points;

calculate the rates of phase changes at or proximate respective said specified points for each said at least one Insonification Requirement;

determine a maximum rate of phase change at or proximate each said respective specified point;

calculate an integral over at least a portion of said aperture, said integral including the absolute values of said maximum rates of phase changes at or proximate said specified points; and

calculate a global cost value for an initial Geometrical Design as a function of a numerical value of an ultrasonic transducer Optimization Attribute.

6. The system of claim 1 wherein said component Optimization Attribute comprises a member of the group consisting of:

an ultrasonic transducer Optimization Attribute, an acoustic lens Optimization Attribute, and an acoustic mirror Optimization Attribute.

7. The system of claim 1 wherein said Basic Problem Statement comprises a medium for propagation of ultrasound, a physical property for said medium, and a volume of interest within said medium for insonification by said ultrasound.

8. The system of claim 7 wherein said volume of interest includes at least one of:

a focal point, a subvolume, and an intersection region at an interface.

9. The system of claim 7 wherein said medium comprises a coupling medium.

10. The system of claim 9 wherein said coupling medium comprises at least one of an acoustic mirror and an acoustic lens.

11. The system of claim 9 wherein said physical property for said coupling medium comprises at least one of:

(i) the density of said coupling medium, (ii) the attenuation of said coupling medium, (iii) a sound speed of said coupling medium, (iv) the shape of said coupling medium, (v) the anisotropy of said coupling medium, (vi) the homogeneity of said coupling medium, and (v) the scattering properties of said coupling medium.

12. The system of claim 7 wherein said Basic Problem Statement further comprises physical and geometrical properties of a type of defect to be detected in said volume of interest.

13. The system of claim 12 wherein said physical and geometrical properties of a type of defect to be detected comprise a member of the group consisting of:

(i) the size and shape distribution of said defect;

(ii) the density of said defect;

(iii) the roughness of a surface of said defect; and

(iv) the porosity of said defect.

14. The system of claim 1 wherein said at least one Insonification Requirement comprises at least one of:

(i) a focusing point in a volume of interest, (ii) a focusing range in said volume of interest, (iii) a focusing volume in said volume of interest, (iv) a scanning requirement, (v) an insonification beam direction, (vi) an angular insonification beamwidth, (vii) a spatial insonification beamwidth, (viii) an insonification beam sidelobe level, (ix) an insonification grating lobe level, (x) an insonification beam symmetry requirement, (xi) an insonification beam uniformity requirement, (xii) an insonification signal impulse response, (xiii) an insonification signal frequency response, (xiv) an insonification signal center frequency, (xv) an insonification signal bandwidth, (xvi) an insonification signal pulse type, (xvii) an insonification signal pulse amplitude, and (xviii) an insonification signal pulse duration.

15. The system of claim 1 wherein the Geometrical Design comprises a component Geometrical Constraint.

16. The system of claim 15 wherein said component Geometrical Constraint comprises a member of the group consisting of:

an ultrasonic transducer Geometrical Constraint, an acoustic lens Geometrical Constraint, and an acoustic mirror Geometrical Constraint.

17. The system of claim 15 wherein said component Geometric Constraint comprises a value for any or more of:

(i) a distance between a point on the component and a point on the surface of or within a volume of interest, (ii) the orientation of the component relative to a reference orientation, (iii) the characteristic of the shape of the component, (iv) the number of transducer elements in an ultrasonic transducer, (v) the size of at least one said transducer element in said ultrasonic transducer, (vi) the spacings between said transducer elements in said ultrasonic transducer, (vii) the shape of a transducer element surface in said ultrasonic transducer, (viii) the shape of a transducer element boundary in said ultrasonic transducer, and (ix) the spatial location of said transducer element.

18. The system of claim 15 in which said engine is further programmed to a) change the Geometrical Design for the component, b) determine whether said component Geometrical Constraint is met by said changed component Geometrical Design, and repeat steps a)-b) until said component Geometrical Constraint is met.

19. The system of claim 1 wherein said engine further comprises:

means for computing a global cost value for the component as a function of one or more said numerical values and one or more weighting factors, each said numerical value decreasing monotonically as the desirability of the corresponding Optimization Attribute increases, said one or more weighting factors inputted via said interface; and

means for determining said optimized Geometrical Design of the component by minimizing said component global cost value.

20. The system of claim 1 wherein said interface comprises a data file, said data file including any of:

physical parameters, geometric parameters and ultrasonic parameters for said Basic Problem Statement;

or physical parameters, geometric parameters and ultrasonic parameters for said at least one Insonification Requirement.