Patent US3708745A successfully refreshed from Google Patents.
US3708745A
Expired / Lapsed
US
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System for measuring output power of a resonant piezoelectric electromechanical transducer
Assignee: The Ohio State University
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Filing: 1970-11-12
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Granted: 1973-01-02
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Expires: 1990-11-12
Abstract
Abstract A measuring system utilizing a resonant piezoelectric electromechanical transducer of the horn type having connected to the tip of the horn a transmission line whose length is in multiples of one-half wavelength. A transducer whose output capabilities are to be measured is connected to the other end of the transmission line and therefore excited mechanically. The electrical signal derived therefrom is indicative of its output parameters.
Inventors
- 👤 R Mcmaster
- 👤 C Libby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:45
CPC Classifications
G; G01; G01H; G01H13/00; G01R; G01R29/00; G01R29/22; G10; G10K; G10K11/00; G10K11/18; G10K11/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A test system for indicating the output power of an electromechanical transducer consisting of a resonant structure including piezoelectric driving means integrally formed therewith and operative as a high Q transducer comprising: a second resonant electromechanical transducer having mechanical and electrical properties identical to said transducer for which said output power is to be indicated, a half-wave transmission line for mechanically joining said transducers at their points of near maximum longitudinal displacement, means for connecting said second transducer to a variable electrical load, means for electrically exciting said test transducer structure at its resonant frequency and means for indicating the output power of said second transducer.
Claim 2
Dependent Claim
106 words
A test system for indicating the output power of an electromechanical transducer consisting of a resonant structure including piezoelectric driving means integrally formed therewith and operative as a high Q transducer comprising: a second resonant electromechanical transducer having mechanical and electrical properties identical to said transducer for which said output power is to be indicated, a half-wave transmission line for mechanically joining said transducers at their points of near maximum longitudinal displacement, means for connecting said second transducer to a variable electrical load, means for electrically exciting said test transducer structure at its resonant frequency and means for indicating the output power of said second transducer.
Claim 3
Dependent Claim
45 words
A test system as set forth in claim 1 wherein each of said transducers has a tapered portion and wherein said tapered portion is a horn type of amplifier, and wherein said transmission line joins said horns at their points of near maximum longitudinal displacement.
Claim 4
Dependent Claim
22 words
A test system as set forth in claim 2 wherein said transmission line has a midpoint of near zero longitudinal physical displacement.
Claim 5
Dependent Claim
30 words
A test system as set forth in claim 1 wherein said transmission line is of substantially uniform cross section and approximates in diameter said horns at the point of joining.
Claim 6
Dependent Claim
28 words
A test system as set forth in claim 1 wherein said electrical excitation means may have a nonsinusoidal waveform and wherein said transformed energy is a sinusoidal waveform.
Claim 7
Dependent Claim
26 words
A test system as set forth in claim 5 wherein said transmission line coupling said horns at their points of near maximum longitudinal displacement is linear.
References Cited (Backward Citations)
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |