Ultrasonic transducers
Abstract
Abstract A METHOD OF CALIBRATING AN ULTRASONIC TRANSDUCER TO INSPECT A WORKPIECE FOR FLAWS. THE TRANSDUCER TO BE CALIBRATED IS MOUNTED ON A METAL BLOCK HAVING A REFERENCE SUCH AS A CAVITY FROM WHICH ULTRASONIC WAVES MAY BE REFLECTED. THE TRANSDUCER IS ENERGIZED TO TRANSMIT A WAVE INTO THE BLOCK AND A REFERENCE SIGNAL OBTAINED DUE TO THE WAVE BEING REFLECTED FROM THE OBSTACLE. A SECOND TRANSDUCER IS THEN MOUNTED ON THE BLOCK AND A SIGNAL OBTAINED DUE TO A WAVE BEING RECEIVED BY THE SECOND TRANSDUCER. BOTH TRANSDUCERS ARE THEN MOUNTED ON THE WORKPIECE TO BE INSPECTED AND A SIGNAL IS AGAIN OBTAINED DUE TO THE WAVE BEING RECEIVED BY THE SECOND TRANSDUCER. A COMPARISON IS MADE BETWEEN THE SIGNALS DUE TO WAVES RECEIVED BY THE SECOND TRANSDUCER TO ADJUST THE REFERENCE SIGNAL FOR INSPECTING THE WORKPIECE.
Inventors
- 👤 Glenn A Walton
- 👤 Gilbert R Forrer
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |