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Patent US4452086A successfully refreshed from Google Patents.
US4452086A
Expired / Lapsed
US
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Electrodynamic ultrasonic transformer
Assignee: Nukem GmbH
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Filing: 1981-10-20
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Granted: 1984-06-05
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Expires: 2001-10-20
Abstract
Abstract An electrodynamic ultrasonic transformer, having at least one exciting coil and one receiving coil, for use in ultrasonic nondestructive material testing in order to reduce the dead times and to remove or, respectively, minimize negative influences occurring during the measuring of different test piece material and at distance variations without adversely affecting the signal/noise ratio. Those parts of the exciting coil and/or receiving coil designed for current conducting are preferably made of resistance material which is suitable for structural elements embodying electric resistors, and which material will not essentially obstruct the current flow during the exciting phase of the current, and after termination of the excitation will rapidly reduce the energy stored in stray and coupling fields.
Inventors
- 👤 Gerhard Huschelrath
- 👤 Karl Laudenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:45
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/04; G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2412
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
An electrodynamic ultrasonic transformer comprising: a magnet yoke having two poles for establishing a magnetic field between said poles into which a test piece can be placed; an exciting coil positioned between one of said poles and the test piece; and a receiving coil positioned between the test piece and other pole, the exciting and receiving coils having portions serving as current conductors fabricated from an electrical resistance-type material which during an exciting current flow does not substantially impede current flow in the exciting coil and which after excitation, rapidly dissipates energy stored in stray and coupling fields, the exciting and receiving coil portions being formed from different resistance materials, respectively.
Claim 2
Dependent Claim
111 words
An electrodynamic ultrasonic transformer comprising: a magnet yoke having two poles for establishing a magnetic field between said poles into which a test piece can be placed; an exciting coil positioned between one of said poles and the test piece; and a receiving coil positioned between the test piece and other pole, the exciting and receiving coils having portions serving as current conductors fabricated from an electrical resistance-type material which during an exciting current flow does not substantially impede current flow in the exciting coil and which after excitation, rapidly dissipates energy stored in stray and coupling fields, the exciting and receiving coil portions being formed from different resistance materials, respectively.
Claim 3
Dependent Claim
47 words
A transformer according to claim 1 wherein the resistance-type materials used for the current conducting portions of the exciting and receiving coils have an electrical resistance at 20° C. that is in the range of 10-70 times that of the resistance of copper wire at 20° C.
Claim 4
Dependent Claim
59 words
An electrodynamic ultrasonic transformer for use in ultrasonic non-destructive material testing comprising: an exciting coil; and a receiving coil, parts of said coils serving as current conductors being made of resistance material, the specific resistance of the resistance material at 20° C. being in the range of 10-70 times that of the resistance of copper wire at 20° C.
Claim 5
Dependent Claim
59 words
An electrodynamic ultrasonic transformer for use in ultrasonic non-destructive material testing comprising: an exciting coil; and a receiving coil, parts of said coils serving as current conductors being made of resistance material, the specific resistance of the resistance material at 20° C. being in the range of 10-70 times that of the resistance of copper wire at 20° C.
Claim 6
Dependent Claim
21 words
An electrodynamic ultrasonic transformer according to claim 3, wherein the exciting coil and receiving coil are made of different resistance materials.
Claim 7
Dependent Claim
19 words
An electrodynamic ultrasonic transformer according to claim 3 or 4, wherein the receiving coil is made of NiCr 6015.
Claim 8
Dependent Claim
17 words
An electrodynamic ultrasonic transformer according to claim 3, wherein the exciting coil is made of CuNi 11.
Claim 9
Dependent Claim
20 words
An electrodynamic ultrasonic transformer according to claim 3, wherein the resistance material comprises a metal powder and a binding agent.
Claim 10
Dependent Claim
21 words
An electrodynamic ultrasonic transformer according to claim 3 wherein the resistance material comprises a metal alloy powder and a binding agent.
Claim 11
Dependent Claim
18 words
An electrodynamic ultrasonic transformer according to claim 3 wherein the resistance material comprises carbon and a binding agent.
Claim 12
Dependent Claim
18 words
An electrodynamic ultrasonic transformer according to claim 3, wherein the resistance material is applied to a carrier material.
Claim 13
Dependent Claim
21 words
An electrodynamic ultrasponic transformer according to claim 10 wherein the resistance material is applied to the carrier material by cathodic sputtering.
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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |