US4725989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method controlling the focusing of an ultrasonic field and apparatus for performing said method
Assignee: Siemens AG
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Filing: 1986-12-12
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Granted: 1988-02-16
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Expires: 2006-12-12
Abstract
Abstract The invention concerns a method for surveying the focal point (F, F') of a focussed ultrasonic field (8, 14) and an apparatus for carrying out the method. According to the invention an ultrasonic field (4, 12) produced by an ultrasonic transmitter (2) is measured at several sites in a plane in the path of the waves at the site of the imaging device (6). The values determined at these sites are compared with given reference values for which the position of the focus is known. In an advantageous device, one surface of the imaging device (6) is equipped with several piezoelectric transducers.
Inventors
- 👤 Bernd Granz
- 👤 Peter Krammer
- 👤 Bertram Sachs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
G; G01; G01H; G01H3/00; G01H3/005; G10; G10K; G10K11/00; G10K11/18; G10K11/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
A method for surveying the properties of a focus of an acoustic wave, the focus being formed by an imaging device, comprising the steps of: measuring said wave at several sites disposed in an imaginary surface intersecting the path of said acoustic wave, said surface corresponding to a focusing surface of said imaging device to obtain test signals; and comparing said test signals to preselected reference values corresponding to a test acoustic wave with a known focus.
Claim 2
Independent Claim
77 words
A method for surveying the properties of a focus of an acoustic wave, the focus being formed by an imaging device, comprising the steps of: measuring said wave at several sites disposed in an imaginary surface intersecting the path of said acoustic wave, said surface corresponding to a focusing surface of said imaging device to obtain test signals; and comparing said test signals to preselected reference values corresponding to a test acoustic wave with a known focus.
Claim 3
Independent Claim
51 words
An apparatus for surveying the properties of a focus of an acoustic wave comprising: an imaging device including an acoustic lens consisting of a polymer; and transducer means attached to said lens for measuring test signals, said transducer means including a piezoelectric polymer foil disposed on a surface of said lens.
Claim 4
Independent Claim
51 words
An apparatus for surveying the properties of a focus of an acoustic wave comprising: an imaging device including an acoustic lens consisting of a polymer; and transducer means attached to said lens for measuring test signals, said transducer means including a piezoelectric polymer foil disposed on a surface of said lens.
Claim 5
Dependent Claim
39 words
The apparatus according to claim 2 wherein said piezoelectric polymer foil is partitioned into an assembly of electrodes in the form of a matrix, each of said electrodes having connecting lead extending to an edge of the polymer foil.
Claim 6
Dependent Claim
26 words
The apparatus according to claim 3, wherein said imaging element includes an acoustic lens, said lens being separated into two parts by said piezoelectric polymer foil.
Claim 7
Dependent Claim
93 words
The apparatus according to claim 2 wherein said imaging device includes an acoustic lens having a focal point F, and a surface facing said focal point, said piezoelectric polymer foil being arranged on said surface, said piezoelectric polymer foil having a center electrode conforming to the curvature of said surface (82) and ring-shaped outer electrodes (96) arranged concentrically about said center electrode, said electrodes being equipped with connecting leads, which extend to an edge of said polymer foil (90); said electrodes being arranged substantially rotation symmetrically about the axis of said lens (84).
Claim 8
Independent Claim
83 words
An apparatus for surveying the properties of a focus of an acoustic planar wave comprising: an imaging device; an imaging element of said imaging device having a focal point and a plurality of bore holes; and transducer means disposed in said holes for generating signals, which signals may be compared to reference values corresponding to a test acoustic wave with a known focus to determine whether the focal point of said acoustical planar wave coincides with the focal point of said imaging element.
Claim 9
Independent Claim
83 words
An apparatus for surveying the properties of a focus of an acoustic planar wave comprising: an imaging device; an imaging element of said imaging device having a focal point and a plurality of bore holes; and transducer means disposed in said holes for generating signals, which signals may be compared to reference values corresponding to a test acoustic wave with a known focus to determine whether the focal point of said acoustical planar wave coincides with the focal point of said imaging element.
Claim 10
Independent Claim
74 words
A method for surveying the properties of a focus of an acoustic wave, the focus being formed by an imaging device, comprising the steps of: measuring said wave at several sites disposed in an imaginary surface intersecting the path of said acoustic wave, said surface being located inside said imaging device to obtain test signals; and comparing said test signals to preselected reference values corresponding to a test acoustic wave having a known focus.
Claim 11
Independent Claim
74 words
A method for surveying the properties of a focus of an acoustic wave, the focus being formed by an imaging device, comprising the steps of: measuring said wave at several sites disposed in an imaginary surface intersecting the path of said acoustic wave, said surface being located inside said imaging device to obtain test signals; and comparing said test signals to preselected reference values corresponding to a test acoustic wave having a known focus.
Claim 12
Independent Claim
48 words
An apparatus for surveying the properties of a focus of an acoustic wave comprising: an imaging device including a concave mirror; and transducer means attached to said lens for measuring test signals, said transducer means including a piezoelectric polymer foil disposed on a surface of said concave mirror.
Claim 13
Independent Claim
48 words
An apparatus for surveying the properties of a focus of an acoustic wave comprising: an imaging device including a concave mirror; and transducer means attached to said lens for measuring test signals, said transducer means including a piezoelectric polymer foil disposed on a surface of said concave mirror.
Claim 14
Dependent Claim
39 words
The apparatus according to claim 8 wherein said piezoelectric polymer foil is partitioned into an assembly of electrodes in the form of a matrix, each of said electrodes having connected lead extending to an edge of the polymer foil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |