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In ultrasonic testing each signal is called an indication. In case this indication cannot be assigned to any reflection at a known place (i.e. back panel / side panel) you speak of an imperfection as cause of an indication and you assume a defect in the material. By comparing this indication with an echo of a reference reflector (as standard according to the height and size of the indication) it is evaluated. The imperfection can be evaluated based on the height and size of its indication according to the sprcification as

  • Indication with amplitude above reporting/recording level
  • (Possibly reparable) defect