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ULTRASONIC TESTING METHOD AND EQUIPMENT THEREFOR

  • US 20110088476A1
  • Filed: 03/27/2009
  • Published: 04/21/2011
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
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1. An ultrasonic testing method comprising the steps of:

  • arranging an ultrasonic probe having a plurality of transducers arranged along an annular curved surface obtained by cutting a predetermined spheroid with two parallel planes facing to each other that do not pass through the center of the spheroid and do not sandwich the center of the spheroid, the two parallel planes being orthogonal to a rotational axis of the spheroid, so as to face a tubular test object so that a longer axis direction of the ultrasonic probe is along an axial direction of the tubular test object, a shorter axis direction of the ultrasonic probe is along a circumferential direction of the tubular test object and the center of the spheroid correctly faces to the axial center of the tubular test object;

    causing transducers appropriately selected from the plurality of the transducers to transmit and receive ultrasonic waves so that the ultrasonic waves are propagated in the tubular test object in a plurality of different propagation directions; and

    displaying ultrasonic testing waveforms received by the selected transducers radially corresponding to the propagation directions of the ultrasonic waves transmitted and received by the selected transducers, whereinthe shape of the annular curved surface is determined so that respective external refraction angles of the ultrasonic wave in the plurality of propagation directions are approximately equivalent and/or respective internal refraction angles of the ultrasonic wave in the plurality of propagation directions are approximately equivalent.

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