{"title":"The simulation for ultrasonic testing based on frequency-phase coded excitation","authors":"Xinyu Zhao, Jiaying Zhang, S. Cong, T. Gang","doi":"10.1504/IJCMSSE.2019.10023225","DOIUrl":null,"url":null,"abstract":"Large time-bandwidth product coded signal and pulse compression are introduced into ultrasonic testing. Linear frequency modulation (LFM) excitation is usually used to improve time resolution, but sidelobe should be suppressed to detect smaller flaws nearby. Barker coded excitation is usually used to suppress sidelobe, but time resolution of results is lower than LFM excitation. So frequency-phase coded excitation is proposed to obtain higher time resolution and lower sidelobe level. The proposed excitation signal is applying LFM to each sub-pulse of Barker code, and it is called LFM-B13. The results of simulations demonstrate that, time resolution of LFM-B13 excitation is approximately 40% higher than that of LFM excitation, and main sidelobe level of LFM-B13 excitation is approximately 4 dB lower than that of LFM excitation, when 60% bandwidth of 5 MHz central frequency transducers are used.","PeriodicalId":39426,"journal":{"name":"International Journal of Computational Materials Science and Surface Engineering","volume":" ","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2019-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Computational Materials Science and Surface Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1504/IJCMSSE.2019.10023225","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Engineering","Score":null,"Total":0}
引用次数: 2
Abstract
Large time-bandwidth product coded signal and pulse compression are introduced into ultrasonic testing. Linear frequency modulation (LFM) excitation is usually used to improve time resolution, but sidelobe should be suppressed to detect smaller flaws nearby. Barker coded excitation is usually used to suppress sidelobe, but time resolution of results is lower than LFM excitation. So frequency-phase coded excitation is proposed to obtain higher time resolution and lower sidelobe level. The proposed excitation signal is applying LFM to each sub-pulse of Barker code, and it is called LFM-B13. The results of simulations demonstrate that, time resolution of LFM-B13 excitation is approximately 40% higher than that of LFM excitation, and main sidelobe level of LFM-B13 excitation is approximately 4 dB lower than that of LFM excitation, when 60% bandwidth of 5 MHz central frequency transducers are used.
期刊介绍：
IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.
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