Acoustical position gage
US4545249A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Sep 6, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B17/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic defect detection assembly (A) and an elongated workpiece (B) are mounted for relative movement. A mechanical assembly (C) provides relative movement between the workpiece and the examination assembly. An electronic circuit and display (D) produces a visual display indicating the relative position of the workpiece and the examination assembly, particularly the relative positions at which the examination assembly detects defects. A transmitting ultrasonic transducer (30) and a receiving ultrasonic transducer (38) are acoustically coupled with the workpiece, one being mounted at a preselected position on the workpiece and the other being mounted for relative movement with the examination assembly. The relative position of the workpiece and examination assembly is determined by measuring changes in a characteristic of the acoustic wave traveling between the transmitting and receiving transducers. In various alternate embodiments, the measured characteristic change includes travel time of the acoustic wave between the transmitting and receiving transducers, changes in the phase relationship between the acoustic wave at transmission and at monitoring, changes in the frequen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.