US3754435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material tester
Assignee: STAVELEY INSTRUMENTS Inc 421 NORTH QUAY STREET KENNEWICK WA 99336 A CORP OF WA
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Filing: 1971-11-15
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Granted: 1973-08-28
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Expires: 1991-11-15
Abstract
Abstract A nondestructive material tester is provided with a search unit capable of being air coupled to the workpiece under test. The search unit includes an electrically and acoustically nonconductive insert having an elevated surface between a transducer and the back reflective surface to form a restricted volume. The area between the transducer and the elevated surface causes an increase in the concentration of ultrasonic energy in this restricted volume and therefore increases the sensitivity of the search unit. A reflector is mounted over the transducer and positioned to cause destructive interference or out-of-phase reflections resulting in cancellation of the reflected waves.
Inventors
- 👤 M Zeutschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:32
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2437; G01N29/04; G01N29/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
An ultrasonic search unit including the combination of a backing member, a reflective surface on said backing member, an ultrasonic transducer mounted adjacent said backing member and spaced from said reflective surface for transmitting and/or receiving ultrasonic energy, a protrusion on said backing member extending from said reflective surface, said protrusion being positioned adjacent to the transducer, and a reflector supported by said backing member whereby the ultrasonic transducer is disposed between the protrusion and the reflector, said reflector being spaced from the reflective surface at a distance that causes destructive interference between the reflections from the reflective surface and the reflector.
Claim 2
Dependent Claim
102 words
An ultrasonic search unit including the combination of a backing member, a reflective surface on said backing member, an ultrasonic transducer mounted adjacent said backing member and spaced from said reflective surface for transmitting and/or receiving ultrasonic energy, a protrusion on said backing member extending from said reflective surface, said protrusion being positioned adjacent to the transducer, and a reflector supported by said backing member whereby the ultrasonic transducer is disposed between the protrusion and the reflector, said reflector being spaced from the reflective surface at a distance that causes destructive interference between the reflections from the reflective surface and the reflector.
Claim 3
Dependent Claim
99 words
An ultrasonic search unit including the combination of a backing member a reflective surface on said backing member, an ultrasonic transducer mounted adjacent said backing member and spaced from said reflective surface for transmitting and/or receiving ultrasonic energy, a reflector member disposed in front of said transducer whereby the transducer is disposed between the backing member and the reflector member, said reflective member having a reflective surface disposed substantially parallel to the first reflective surface on said backing member, said reflective surfaces being separated from each other by a distance which will create destructive interference between the reflections therefrom.
Claim 4
Dependent Claim
99 words
An ultrasonic search unit including the combination of a backing member a reflective surface on said backing member, an ultrasonic transducer mounted adjacent said backing member and spaced from said reflective surface for transmitting and/or receiving ultrasonic energy, a reflector member disposed in front of said transducer whereby the transducer is disposed between the backing member and the reflector member, said reflective member having a reflective surface disposed substantially parallel to the first reflective surface on said backing member, said reflective surfaces being separated from each other by a distance which will create destructive interference between the reflections therefrom.
Claim 5
Dependent Claim
110 words
An ultrasonic search unit including the combination of an acoustic backing member, a reflective surface on said backing member, an ultrasonic transducer effective to vibrate and radiate ultrasonic energy in response to an electrical signal applied thereto and effective to produce an electrical signal in response to ultrasonic energy incident thereon, means for supporting the transducer on said backing member spaced from and parallel to said reflective surface, and a reflector member supported by said backing member in front of the transducer and in spaced relation thereto, said reflector member having a reflective surface on the front thereof spaced one quarter wavelength from the reflective surface of the mounting member.
Claim 6
Dependent Claim
110 words
An ultrasonic search unit including the combination of an acoustic backing member, a reflective surface on said backing member, an ultrasonic transducer effective to vibrate and radiate ultrasonic energy in response to an electrical signal applied thereto and effective to produce an electrical signal in response to ultrasonic energy incident thereon, means for supporting the transducer on said backing member spaced from and parallel to said reflective surface, and a reflector member supported by said backing member in front of the transducer and in spaced relation thereto, said reflector member having a reflective surface on the front thereof spaced one quarter wavelength from the reflective surface of the mounting member.
Claim 7
Dependent Claim
137 words
An ultrasonic search unit including the combination of an acoustic mounting member, a reflective surface on said mounting member, an ultrasonic transducer effective to vibrate and radiate ultrasonic energy therefrom in response to ultrasonic energy incident thereon, a plurality of mountings on said mounting member, said mountings being spaced from each other and projecting from said surface, retaining means extending between said mountings, said transducer being carried by the retaining means and suspended in spaced relation to the reflective surface, a reflective member secured to the mouNtings in front of at least a portion of said transducer, and a reflective surface on the front of said reflective member disposed parallel to the reflective surface on the backing member, said reflective surfaces being separated from each other by a distance which causes destructive interference between the reflections therefrom.
Claim 8
Dependent Claim
137 words
An ultrasonic search unit including the combination of an acoustic mounting member, a reflective surface on said mounting member, an ultrasonic transducer effective to vibrate and radiate ultrasonic energy therefrom in response to ultrasonic energy incident thereon, a plurality of mountings on said mounting member, said mountings being spaced from each other and projecting from said surface, retaining means extending between said mountings, said transducer being carried by the retaining means and suspended in spaced relation to the reflective surface, a reflective member secured to the mouNtings in front of at least a portion of said transducer, and a reflective surface on the front of said reflective member disposed parallel to the reflective surface on the backing member, said reflective surfaces being separated from each other by a distance which causes destructive interference between the reflections therefrom.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |