{"title":"Reducing Dead Zone in Ultrasonic Time-of-Flight Diffraction (TOFD): A Review","authors":"Shijie Jin, Xu Sun, Zhongbing Luo","doi":"10.1134/S1061830923601265","DOIUrl":null,"url":null,"abstract":"<p>Ultrasonic time-of-flight diffraction (TOFD) technique is a means of defect detection adopting the diffracted longitudinal waves from flaw tips. However, the dead zone is induced by the coupling between tip-diffracted longitudinal wave and lateral wave or longitudinal back-wall wave. In this paper, the methods for reducing dead zone are reviewed from parameter optimization, alternative TOFD techniques and signal processing techniques. The principles, effects and influencing factors of different methods are analyzed and compared in sequence. Finally, the future challenges focus on the multiple overlapped signals (<i>N</i> ≥ 3) from shallow subsurface defects in thin plates and the change of dead zone induced by irregular structure.</p>","PeriodicalId":764,"journal":{"name":"Russian Journal of Nondestructive Testing","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Nondestructive Testing","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S1061830923601265","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
引用次数: 0
Abstract
Ultrasonic time-of-flight diffraction (TOFD) technique is a means of defect detection adopting the diffracted longitudinal waves from flaw tips. However, the dead zone is induced by the coupling between tip-diffracted longitudinal wave and lateral wave or longitudinal back-wall wave. In this paper, the methods for reducing dead zone are reviewed from parameter optimization, alternative TOFD techniques and signal processing techniques. The principles, effects and influencing factors of different methods are analyzed and compared in sequence. Finally, the future challenges focus on the multiple overlapped signals (N ≥ 3) from shallow subsurface defects in thin plates and the change of dead zone induced by irregular structure.
期刊介绍：
Russian Journal of Nondestructive Testing, a translation of Defectoskopiya, is a publication of the Russian Academy of Sciences. This publication offers current Russian research on the theory and technology of nondestructive testing of materials and components. It describes laboratory and industrial investigations of devices and instrumentation and provides reviews of new equipment developed for series manufacture. Articles cover all physical methods of nondestructive testing, including magnetic and electrical; ultrasonic; X-ray and Y-ray; capillary; liquid (color luminescence), and radio (for materials of low conductivity).
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