220 ステンレス薄膜加熱を利用した赤外線サーモグラフィ法(OS6-3 非破壊評価と構造モニタリング,OS6 非破壊評価と構造モニタリング)

抄録

There are two reasons why IR-thermography, as a nondestructive inspection method, can't work well for non-painted metal; It is difficult to measure a temperature of a low emissivity surface by IR-thermography device. In addition, radiant energy is hardly absorbed in such a surface. For solving these two problems, the surface of the target should have been painted with black ink which has high emissivity. But this method is hard to apply during operation. In this report, we proposed a new active-thermography method with a thin stainless film. The film is painted with black ink for giving higher emissivity and it can heat the specimen surface uniformly by Joule energy. On the other hand, because the film is very thin, the target temperature appears on the surface of the stainless film, which can be observed by IR-thermography. The flaw size and depth can be identified from two data, temperature difference and phase difference between the flaw and normal area. It was confirmed that FEM simulation results are similar to experimental results for flat-bottomed holes.