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Method and apparatus for detecting flaws using ultrasonic helical waves

  • US 3,299,694 A
  • Filed: 03/26/1963
  • Issued: 01/24/1967
  • Est. Priority Date: 11/09/1961
  • Status: Expired due to Term
First Claim
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1. IN A METHOD FOR INVESTIGATING FLAWS IN A MEMBER, INTRODUCING AT LEAST ONE ULTRASONIC WAVE TRAIN AT A PREDETERMINED GROUP VELOCITY INTO THE MEMBER, A PORTION OF THE WAVE TRAIN BEING DEFLECTED BY A FLAW TO PROVIDE AT LEAST TWO DEFLECTED WAVE TRAINS TRAVELLING IN DIRECTIONS DIFFERING FROM THE DIRECTION IN WHICH THE ULTRASONIC WAVE TRAIN IS INTRODUCED INTO THE MEMBER, MEASURING THE DIFFERENCE IN TIME OF TRAVEL OF THE TWO DEFLECTED WAVE TRAINS TO PREDETERMINED POINTS, AND DETERMINING AT LEAST ONE OF THE COORDINATES OF THE FLAW UTILIZING SAID DIFFERENCES IN TIME.

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