The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 1985
Filed:
Sep. 06, 1983
Istvan M Matay, No. Royalton, OH (US);
TRW Inc., Cleveland, OH (US);
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 frequency of the acoustic wave when the frequency is adjusted to maintain the phase relationship substantially constant, and the like.