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The applicability of ultrasound infrared thermography method for real-time crack detection is described. in this technique, an ultrasound wave passing through a material with mechanical discontinuity, such as a crack of disbond, causes temperature raise of that due to internal friction or thermo-mechanical effect. And the elastic wave with vibration energy is converted to the heat in the vicinity of the crack of the defect. It is local heat emitted in the crack of the defect is monitored as the hot spot area via the thermal infrared camera. As defects are usually correlated with an enhanced loss angle, ultrasound infrared lock-in thermography (ULT) is a defect selective NDE method. In this paper we investigate the applicability of ULT for maintenance and inspection. The test material was austenitic STS 304, Which is used as pipelines in the reactor coolant system of a nuclear power plants. Internal crack in a pipe using ultrasound infrared lock-in thermography imaging to detect defects were. Check direction of 0 °, 90 °, 180 °, 270 ° in order was in progress. LPT method to obtain more specific infrared thermal imaging to determine the location of defective parts could be. At the end of the crack was able to identify hot spots.

Using ultrasound infrared thermography to detect defects in pipes