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US3577774A
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Electrostatic ultrasonic nondestructive testing device
Assignee: United States Atomic Energy Commission
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Filing: 1969-02-24
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Granted: 1971-05-04
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Expires: 1989-02-24
Abstract
Abstract An ultrasonic device for nondestructively testing an electrically conductive sample comprises an electrode mounted to said sample and electrically insulated therefrom. Means are provided for generating a pulsed potential difference between the sample and the electrode to generate an elastic wave in the sample. A bias voltage is applied to the electrode and an oscilloscope is used to detect, relative in time to the applied pulsed potential difference of the electrode, changes in the bias potential of the electrode response to the elastic wave.
Inventors
- 👤 Robert W Steffens
- 👤 Milton F Zeutschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:22
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
An ultrasonic device for nondestructively testing an electrically conductive sample comprising an electrode mounted adjacent one side of said sample, a dielectric material contact mounted between said electrode and said side of said sample and sized greater than said electrode to inhibit electrostatic-field fringing between said sample and said electrode, means for generating a pulsed potential difference between said sample and said electrode to generate a pulsed elastic wave in said sample, means for applying a bias voltage to said electrode, and means for detecting relative in time to said applied pulsed potential difference changes in the bias potential of said electrode responsive to said elastic wave to provide a measure of the physical properties of said sample.
Claim 2
Dependent Claim
118 words
An ultrasonic device for nondestructively testing an electrically conductive sample comprising an electrode mounted adjacent one side of said sample, a dielectric material contact mounted between said electrode and said side of said sample and sized greater than said electrode to inhibit electrostatic-field fringing between said sample and said electrode, means for generating a pulsed potential difference between said sample and said electrode to generate a pulsed elastic wave in said sample, means for applying a bias voltage to said electrode, and means for detecting relative in time to said applied pulsed potential difference changes in the bias potential of said electrode responsive to said elastic wave to provide a measure of the physical properties of said sample.
References Cited (Backward Citations)
US2534006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |