Patent US4646967A successfully refreshed from Google Patents.
US4646967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic water jet having electromagnetic interference shielding
Assignee: Boeing Co
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Filing: 1985-10-18
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Granted: 1987-03-03
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Expires: 2005-10-18
Abstract
Abstract An ultrasonic water jet having first and second housing members. The first housing member includes an interior exponentially shaped duct and a plurality of water inlets equiangularly displaced and circumferentially disposed about the central axis of the exponentially shaped duct for cleansing a face of the quarter wave matching plate which is bonded to a ceramic disk transducer which forms part of a hermetically sealed assembly. This transducer assembly is both water tight and electromagnetically shielded.
Inventors
- 👤 Glenn A. Geithman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:17
CPC Classifications
B; B05; B05B; B05B17/00; B05B17/04; B05B17/06; B05B17/0607; B05B17/0623; B05B17/063; B08; B08B; B08B2203/00; B08B2203/02; B08B2203/0288
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
In combination an apparatus providing through transmission water jet coupling for ultrasonic scanning: a first non-electrically conductive housing section having an interior exponentially shaped duct; a second electrically conductive housing section; a disk shaped piezoelectric transducer concentrically disposed about the central axis of said exponentially shaped duct and within said second electrically conductive housing section; a matching plate disposed across the inlet of said interior exponentially shaped duct and between said first non-electrically conductive housing section and said disk shaped piezoelectric transducer; said matching plate having a thickness T=nλ/4) where n is a constant equal to either the fundamental frequency of said disk-shaped piezoelectric transducer when n=1, or odd harmonic frequencies thereof when n=an odd interger greater than one, and λ=wavelength of sound in said matching plate; and, a tone burst oscillator coupled to said disk shaped piezoelectric transducer for providing about 5 cycles of tone burst energy at the excitation frequency of said disk shaped piezoelectric transducer.
Claim 2
Dependent Claim
158 words
In combination an apparatus providing through transmission water jet coupling for ultrasonic scanning: a first non-electrically conductive housing section having an interior exponentially shaped duct; a second electrically conductive housing section; a disk shaped piezoelectric transducer concentrically disposed about the central axis of said exponentially shaped duct and within said second electrically conductive housing section; a matching plate disposed across the inlet of said interior exponentially shaped duct and between said first non-electrically conductive housing section and said disk shaped piezoelectric transducer; said matching plate having a thickness T=nλ/4) where n is a constant equal to either the fundamental frequency of said disk-shaped piezoelectric transducer when n=1, or odd harmonic frequencies thereof when n=an odd interger greater than one, and λ=wavelength of sound in said matching plate; and, a tone burst oscillator coupled to said disk shaped piezoelectric transducer for providing about 5 cycles of tone burst energy at the excitation frequency of said disk shaped piezoelectric transducer.
Claim 3
Dependent Claim
20 words
The invention according to claim 1 wherein said tone burst energy has a frequency of about 1 MH z .
Claim 4
Dependent Claim
20 words
The invention according to claim 1 wherein said tone burst energy has a frequency of about 5 MH z .
Claim 5
Independent Claim
172 words
A method comprising the steps of: providing an apparatus having through transmission water jet coupling for ultrasonic scanning which includes: a first non-electrically conductive housing section having an interior exponentially shaped duct; a second electrically conductive housing section; a disk shaped piezoelectric transducer concentrically disposed about the central axis of said exponentially shaped duct and within said second electrically conductive housing section; a matching plate disposed across the inlet of said interior exponentially shaped duct and between said first non-electrically conductive housing section and said disk shaped piezoelectric transducer; said matching plate having a thickness T=n(λ/4) where n is a constant equal to either the fundamental frequency of said disk-shaped piezoelectric transducer when n=1, or odd harmonic frequencies thereof when n=an odd integer greater than one, and λ=wavelength of sound in said matching plate; and, then coupling a tone burst oscillator to said disk shaped piezoelectric transducer and further providing with said tone burst oscillator about 5 cycles of tone burst energy at the excitation frequency of said disc shaped piezoelectric transducer.
Claim 6
Independent Claim
172 words
A method comprising the steps of: providing an apparatus having through transmission water jet coupling for ultrasonic scanning which includes: a first non-electrically conductive housing section having an interior exponentially shaped duct; a second electrically conductive housing section; a disk shaped piezoelectric transducer concentrically disposed about the central axis of said exponentially shaped duct and within said second electrically conductive housing section; a matching plate disposed across the inlet of said interior exponentially shaped duct and between said first non-electrically conductive housing section and said disk shaped piezoelectric transducer; said matching plate having a thickness T=n(λ/4) where n is a constant equal to either the fundamental frequency of said disk-shaped piezoelectric transducer when n=1, or odd harmonic frequencies thereof when n=an odd integer greater than one, and λ=wavelength of sound in said matching plate; and, then coupling a tone burst oscillator to said disk shaped piezoelectric transducer and further providing with said tone burst oscillator about 5 cycles of tone burst energy at the excitation frequency of said disc shaped piezoelectric transducer.
Claim 7
Dependent Claim
33 words
The invention according to claim 4 wherein the step of providing about 5 cycles of tone burst energy comprises providing said tone burst energy at a frequency of about 1 MH z .
Claim 8
Dependent Claim
33 words
The invention according to claim 4 wherein the step of providing about 5 cycles of tone burst energy comprises providing said tone burst energy at a frequency of about 5 MH z .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |