US3918295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of nondestructively testing materials by ultrasound
Assignee: Individual
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Filing: 1973-05-30
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Granted: 1975-11-11
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Expires: 1993-05-30
Abstract
Abstract A method of nondestructively testing materials by ultrasound comprises continuously supplying a non-contact-making transmitter with electrical high-frequency power at a suitable frequency for generating ultrasound waves; amplitude-modulating with a low frequency in the transmitter and/or in a receiver the ultrasound waves generated in the transmitter and/or the signal voltage received in the receiver by the creation of a low-frequency magnetic field; and using the amplitude-modulation for separating the received signals from internal noise or external interference.
Inventors
- 👤 Joachim Herbertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:35
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2412; G01N29/34; G01N29/346; G01N2291/00; G01N2291/04; G01N2291/042; G01N2291/0423; G01N2291/044
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A methOd of nondestructively testing materials by a transmitter and a receiver of ultrasound, wherein the transmitter and receiver each have characteristic directional lobes during operation thereof, said method comprising the steps of: a. continuously supplying a non-contact-making transmitter with electrical high frequency power at a suitable frequency for generating ultrasound waves; b. amplitude-modulating the generated ultrasound waves with a low frequency produced by the creation of a low-frequency magnetic field, and c. separating the received acoustical signals from internal noise or external interference by detection of the amplitudemodulation.
Claim 2
Independent Claim
89 words
A methOd of nondestructively testing materials by a transmitter and a receiver of ultrasound, wherein the transmitter and receiver each have characteristic directional lobes during operation thereof, said method comprising the steps of: a. continuously supplying a non-contact-making transmitter with electrical high frequency power at a suitable frequency for generating ultrasound waves; b. amplitude-modulating the generated ultrasound waves with a low frequency produced by the creation of a low-frequency magnetic field, and c. separating the received acoustical signals from internal noise or external interference by detection of the amplitudemodulation.
Claim 3
Dependent Claim
45 words
A method as defined in claim 1, wherein the characteristic directional lobes of the transmitter and the receiver are caused locally to overlap in a geometrical configuration whereby the reception of the sound waves refracted or reflected by the defect also positionally locates the defect.
Claim 4
Dependent Claim
59 words
A method as defined in claim 1, wherein the transmitter is unilaterally directionally coupled to a first particular mode; a second particular mode is generated by conversion of said first generated mode, and there is a receiver which is unidirectionally coupled to said second particular mode whereby the receiver detects a defect by the reception of the second mode.
Claim 5
Dependent Claim
30 words
A method as defined in claim 3, wherein the mode transmitted by the transmitter is transmitted in the form of right or left hand helices for testing rods or tubes.
Claim 6
Independent Claim
87 words
A method of nondestructively testing materials by ultrasound comprising the steps of: a. providing non-contact-making means for transmitting and receiving ultrasound waves within the material to be tested, b. continuously supplying the transmitting means with electrical high-frequency power at a suitable frequency for generating ultrasound waves, c. producing a low-frequency in the non-contact-making means to amplitude-modulate the high-frequency oscillations present in the non-contact-making means during operation thereof, and d. evaluating the amplitude-modulated high-frequency oscillations to separate the received acoustical signals caused by internal noise or external interference.
Claim 7
Independent Claim
87 words
A method of nondestructively testing materials by ultrasound comprising the steps of: a. providing non-contact-making means for transmitting and receiving ultrasound waves within the material to be tested, b. continuously supplying the transmitting means with electrical high-frequency power at a suitable frequency for generating ultrasound waves, c. producing a low-frequency in the non-contact-making means to amplitude-modulate the high-frequency oscillations present in the non-contact-making means during operation thereof, and d. evaluating the amplitude-modulated high-frequency oscillations to separate the received acoustical signals caused by internal noise or external interference.
Claim 8
Dependent Claim
16 words
A method as defined in claim 10, wherein the low-frequency is produced in the transmitting means.
Claim 9
Dependent Claim
16 words
A method as defined in claim 10, wherein the low-frequency is produced in the receiving means.
Claim 10
Dependent Claim
20 words
A method as defined in claim 10, wherein the low-frequency is produced by the creation of a low-frequency magnetic field.
Claim 11
Independent Claim
85 words
A method of nondestructively testing materials by ultrasound comprising the steps of: a. providing a non-contact-making transmitter and a non-contact-making receiving receiver of ultrasound waves within the material to be tested, b. continuously supplying the transmitter with a suitable frequency for generating ultrasound waves, c. amplitude-modulating the signal voltage received in the receiver with a low-frequency produced by the creation of a low-frequency magnetic field, and d. evaluating the amplitude-modulated high-frequency oscillations to separate the received acoustical signals caused by internal noise or external interference.
Claim 12
Independent Claim
85 words
A method of nondestructively testing materials by ultrasound comprising the steps of: a. providing a non-contact-making transmitter and a non-contact-making receiving receiver of ultrasound waves within the material to be tested, b. continuously supplying the transmitter with a suitable frequency for generating ultrasound waves, c. amplitude-modulating the signal voltage received in the receiver with a low-frequency produced by the creation of a low-frequency magnetic field, and d. evaluating the amplitude-modulated high-frequency oscillations to separate the received acoustical signals caused by internal noise or external interference.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |