US3786672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-dimensional coils for electro-magnetic generation and detection of acoustic waves
Assignee: United States Atomic Energy Commission
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Filing: 1972-09-20
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Granted: 1974-01-22
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Expires: 1992-09-20
Abstract
Abstract Apparatus and method for producing and detecting magnetic and non-magnetic acoustic waves in a conductive body, wherein the waves are generated electromagnetically by a constant amplitude wave front transmitted to a surface of the body by a twodimensional, flat, spirally wound coil in a plane parallel to and spaced from the conductive surface, and like coil means or a quartz transducer are used for detection. Specific transducers having dual, race-track shaped, two-dimensional coils are described for selectively generating and detecting magnetic directly generated acoustic waves when the body is immersed in a magnetic field, and non-magnetic directly generated acoustic waves when the magnetic field is reduced or removed entirely. A single spiral, two-dimensional coil, is also used for selectively producing and/or detecting the non-magnetically generated acoustic waves.
Inventors
- 👤 M Gaerttner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2412; B; B06; B06B; B06B1/00; B06B1/02; B06B1/04; G01N2291/00; G01N2291/04; G01N2291/042; G01N2291/0421; G01N2291/0422
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
In an ultrasound transducer having radio-frequency source means for producing electromagnetic fields at a conductive surface of a first means that is conductive, the improvement, comprising a system consisting of: a two-dimensional, flat, spirally wound, dual-spiral, race-track shaped coil means comprising two spirals each of race-track shape adjacent one another in a plane and together forming a pair of oppositely wound sections in a flat current sheet in a plane parallel to and spaced from said conductive surface and connected to said ratio-frequency source means for transmitting said electromagnetic fields to said conductive surface so that said coil means directly generates acoustic waves that propagate in said first means to excite currents at another surface of said first means.
Claim 2
Dependent Claim
119 words
In an ultrasound transducer having radio-frequency source means for producing electromagnetic fields at a conductive surface of a first means that is conductive, the improvement, comprising a system consisting of: a two-dimensional, flat, spirally wound, dual-spiral, race-track shaped coil means comprising two spirals each of race-track shape adjacent one another in a plane and together forming a pair of oppositely wound sections in a flat current sheet in a plane parallel to and spaced from said conductive surface and connected to said ratio-frequency source means for transmitting said electromagnetic fields to said conductive surface so that said coil means directly generates acoustic waves that propagate in said first means to excite currents at another surface of said first means.
Claim 3
Dependent Claim
55 words
The sections of claim 1 having another pair of sections forming a dual-spiral coil similarly constructed and arranged adjacent said first means so that said first means is interposed between said two pairs of transducer sections, whereby one of said pairs generates said acoustic waves, and said other of said pairs detect said acoustic waves.
Claim 4
Dependent Claim
37 words
The sections of claim 1 having straight and connecting end portions that are continuously connected to form adjacent spirals wound in opposite directions so that currents are oppositely directed in said spirals in a flat current sheet.
Claim 5
Dependent Claim
27 words
The sections of claim 3 in which said straight sections are parallel with each other and form a constant wave front under a central circular region thereof.
Claim 6
Dependent Claim
28 words
The sections of claim 1 having magnetic field means for immersing said first means in a static magnetic field for producing said aCoustic waves by magnetic direct generation.
Claim 7
Dependent Claim
25 words
The sections of claim 5 having means for selectively reducing the strength of said magnetic field to produce said acoustic waves by non-magnetic direct generation.
References Cited (Backward Citations)
US3460063A
Cited
US3583213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |