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US5029475A
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Measuring spatial distribution of spacings between point scatterers
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1990-03-23
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Granted: 1991-07-09
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Expires: 2010-03-23
Abstract
Abstract Method of and apparatus for measuring a space distribution of spacings between point scatterers. An ultrasonic wave is applied to an ultrasonic scattering medium which is an aggregation of point scatterers. Ultrasonic waves, scattered from the medium, are converted into an electric signal. The shape of a power spectrum of the electric signal is determined. A fractal analysis is effected so as to determine a fractal dimension and self-similarity with respect to the power spectrum shape. A spatial distribution of a structural inhomogeneity of the scattering medium is measured in accordance with results of the fractal analysis.
Inventors
- 👤 Tsuneo Kikuchi
- 👤 Shogo Kiryu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/11; G01N29/12; G01N29/44; G01N29/4472; G01N2291/00; G01N2291/02; G01N2291/024; G01N2291/02475; G01N2291/028; G01N2291/0289
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
A method of measuring a spatial distribution of spacing between point scatterers, comprising the steps of: applying an ultrasonic wave to an ultrasonic scattering medium which is an aggregation of point scatterers; converting scattered waves, reflected from said ultrasonic scattering medium, into an electric signal; determining the shape of a power spectrum of said electric signal; effecting a fractal analysis so as to determine a fractal dimension and self-similarity with respect to said power spectrum shape; and measuring a spatial distribution of a structural inhomogeneity of said scattering medium in accordance with results of said fractal analysis.
Claim 2
Independent Claim
97 words
A method of measuring a spatial distribution of spacing between point scatterers, comprising the steps of: applying an ultrasonic wave to an ultrasonic scattering medium which is an aggregation of point scatterers; converting scattered waves, reflected from said ultrasonic scattering medium, into an electric signal; determining the shape of a power spectrum of said electric signal; effecting a fractal analysis so as to determine a fractal dimension and self-similarity with respect to said power spectrum shape; and measuring a spatial distribution of a structural inhomogeneity of said scattering medium in accordance with results of said fractal analysis.
Claim 3
Dependent Claim
123 words
Apparatus for measuring a space distribution of spacings between point scatterers, comprising: a transmitting/receiving ultrasonic transducer; means for driving said ultrasonic transducer to cause said vibration to apply an ultrasonic wave to an ultrasonic scattering medium, which is an aggregation of point scatterers, so that said transducer receives scattered waves from said scattering medium and outputs an electric signal representative of said scattered waves; ultrasonic receiver means for converting said electric signal from an analog form into a digital form; power spectrum calculating means responsive to a digital output signal from said ultrasonic receiver means so as to calculate the shape of a power spectrum of said scattered waves; and fractal analysis means for effecting a fractal analysis of said power spectrum shape.
Claim 4
Dependent Claim
123 words
Apparatus for measuring a space distribution of spacings between point scatterers, comprising: a transmitting/receiving ultrasonic transducer; means for driving said ultrasonic transducer to cause said vibration to apply an ultrasonic wave to an ultrasonic scattering medium, which is an aggregation of point scatterers, so that said transducer receives scattered waves from said scattering medium and outputs an electric signal representative of said scattered waves; ultrasonic receiver means for converting said electric signal from an analog form into a digital form; power spectrum calculating means responsive to a digital output signal from said ultrasonic receiver means so as to calculate the shape of a power spectrum of said scattered waves; and fractal analysis means for effecting a fractal analysis of said power spectrum shape.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |