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Method and apparatus for mapping the wall thickness of tubes during production

  • US 6,078,397 A
  • Filed: 04/20/1999
  • Issued: 06/20/2000
  • Est. Priority Date: 04/20/1999
  • Status: Expired due to Fees
First Claim
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1. An apparatus for mapping out wall thickness of a tube or other object having motion in two directions, comprising:

  • first laser means for generating ultrasound propagating inside tube wall over a particular generation spot on a surface of said tube;

    second laser means coupled to an interferometric means for detecting produced ultrasonic echoes over a detection spot on said surface;

    processing means operating on recorded ultrasonic echoes and using a given value of ultrasonic velocity and the distance between said generation spot and said detection spots for determining wall thickness at a mid-point between the generation and detection spot;

    optical displacement measuring means for determining a displacement in two dimensions between said generation spot and arbitrary starting spot; and

    display means for displaying wall thickness values over surface of said tube.

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