著者

後藤 陽一 細貝 英実 原 文雄 阿部 靖則 田中 祥夫

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.625, pp.3342-3347, 1998-09-25

被引用文献数

7

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In-pipe flaw causes a failure in air conditioning pipe system, and to prevent the failure, in-pipe flaw must be diagnosed regularly. For the diagnosis of it, the type and size of the flaw are important information, and a pulsereflection method is usually used, because of its simplicity, where the type and size of in-pipe flaw have an effect on an amplitude of its echo. In this paper, to judge the type and size of in-pipe flaws, we used the two kinds of the amplitude information about the echoes. One is the amplitude of the echo that is reflected from the inner surface of the pipe with the flaws. The other is the amplitude of the echo reflected from the normal surface of the pipe. We used wavelet analysis to obtain the amplitude information about the echoes in the ultrasonic pulse reflected. We showed the results of the in pipe flaw diagnosis by using a test pipe with the artificial flaws on its inner surface and classified the results of flaw diagnosis in three types. Finally, we proposed an estimation method of the size of the in pipe corrosion with some experimental results.