US4603585A
Expired / Lapsed
US
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Method for representing elastic parameters of object surfaces
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1985-03-15
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Granted: 1986-08-05
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Expires: 2005-03-15
Abstract
Abstract A method for representing elastic parameters of object surfaces by scanning the object surface with a focused acoustic beam and detection of the interferences between the ultrasonic beams specularly reflected at the object surface and the ultrasonic beams emitted from the object surface after excitation of surface waves in which either two raster-shaped scannings of the object surface are carried out at different focus positions relative to the object surface or successive scannings are carried out with acoustic beams of different frequency. Reflection signals associated with identical raster points form a difference signal which is used for representing the image.
Inventors
- 👤 Abdullah Atalar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:51
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/34; G01N29/348; G01N29/04; G01N29/041; G01N29/06; G01N29/0654; G01N29/0681; G01N29/22; G01N29/221; G01N29/24; G01N29/2456; G01N29/26; G01N2291/00; G01N2291/01; G01N2291/015; G01N2291/04; G01N2291/042; G01N2291/0423; G01N2291/0426; G01N2291/044; G01N2291/10; G01N2291/101; G01N2291/26; G01N2291/263; G01N2291/2632
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
110 words
A method of representing elastic parameters of the surface of an object comprising the steps for each point of a predetermined pattern of points on said surface of: (a) directing a first acoustic beam having a first focus position at said each point; (b) sensing a first reflection signal; (c) directing a second acoustic beam having a second focus position different from said first focus position at said each point; (d) sensing a second reflection signal; (e) deriving a difference signal having a value indicative of the difference between said first and second reflection signals; and (f) using said difference signal to represent said elastic parameters at said each point.
Claim 2
Independent Claim
110 words
A method of representing elastic parameters of the surface of an object comprising the steps for each point of a predetermined pattern of points on said surface of: (a) directing a first acoustic beam having a first focus position at said each point; (b) sensing a first reflection signal; (c) directing a second acoustic beam having a second focus position different from said first focus position at said each point; (d) sensing a second reflection signal; (e) deriving a difference signal having a value indicative of the difference between said first and second reflection signals; and (f) using said difference signal to represent said elastic parameters at said each point.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, wherein said steps (a)-(f) are all executed for each point before execution proceeds to a next point.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 2, wherein said one of first and second reflection signals for each point is multiplied by a weighting factor prior to derivation of said difference signal for said each point.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 3, wherein said first and second focus positions are selected to maximize said difference signal at at least one of said points.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 2, wherein said first and second reflection signals are fed directly to a difference-forming circuit.
Claim 7
Dependent Claim
55 words
A method as claimed in claim 1, wherein said steps (a) and (b) are both executed for every point in said pattern before execution of any of said steps (c)-(f), and then step (c) and (d) are both executed for every point in said pattern before execution of either of said steps (e) and (f).
Claim 8
Dependent Claim
23 words
A method as claimed in claim 6 wherein each of said first reflection signals and each of said second reflection signals are stored.
Claim 9
Dependent Claim
36 words
A method as claimed in claim 7 wherein one of said first and second reflection signals for each point is multiplied by a weighting factor prior to derivation of said difference signal for said each point.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 6 wherein said first and second focus positions are selected to maximize said difference signal at at least one of said points.
Claim 11
Independent Claim
107 words
A method of representing elastic parameters of the surface of an object comprising the steps for each point of a predetermined pattern of points on said surface of: (a) directing a first acoustic beam having a first frequency at said each point; (b) sensing a first reflection signal; (c) directing a second acoustic beam having a second frequency different from said first frequency at said each point; (d) sensing a second reflection signal; (e) deriving a difference signal having a value indicative of the difference between said first and second reflection signals; and (f) using said difference signal to represent said elastic parameters at said each point.
Claim 12
Independent Claim
107 words
A method of representing elastic parameters of the surface of an object comprising the steps for each point of a predetermined pattern of points on said surface of: (a) directing a first acoustic beam having a first frequency at said each point; (b) sensing a first reflection signal; (c) directing a second acoustic beam having a second frequency different from said first frequency at said each point; (d) sensing a second reflection signal; (e) deriving a difference signal having a value indicative of the difference between said first and second reflection signals; and (f) using said difference signal to represent said elastic parameters at said each point.
Claim 13
Dependent Claim
25 words
A method as claimed in claim 10 wherein said steps (a)-(f) are all executed for said each point before execution proceeds to a next point.
Claim 14
Dependent Claim
35 words
A method as claimed in claim 11 wherein one of said first and second reflection signals for each point is multiplied by a weighting factor prior to derivation of said difference signal for said point.
Claim 15
Dependent Claim
27 words
A method as claimed in claim 12 wherein said first and second frequencies are selected to maximize said difference signal at at least one of said points.
Claim 16
Dependent Claim
21 words
A method as claimed in claim 11 wherein said first and second reflection signals are fed directly to a difference-forming circuit.
Claim 17
Dependent Claim
55 words
A method as claimed in claim 10 wherein said steps (a) and (b) are both executed for every point in said pattern before execution of any of said steps (c)-(f), and then said steps (c) and (d) are executed for every point in said pattern before execution of either of said steps (e) and (f).
Claim 18
Dependent Claim
23 words
A method as claimed in claim 15 wherein each of said first reflection signals and each of said second reflection signals are stored.
Claim 19
Dependent Claim
35 words
A method as claimed in claim 16 wherein one of said first and second reflection signals for each point is multiplied by a weighting factor prior to derivation of said difference signal for said point.
Claim 20
Dependent Claim
27 words
A method as claimed in claim 15 wherein said first and second frequencies are selected to maximize said difference signal at at least one of said points.
References Cited (Backward Citations)
US4459852A
Cited
US4503708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |