{"title":"管道内壁减薄微波检测综合研究:不连续性、反射和信号","authors":"Weiying Cheng","doi":"10.1016/j.ndteint.2024.103269","DOIUrl":null,"url":null,"abstract":"<div><div>Microwave inspection of internal pipe wall thinning (PWT) relies on reflections occurring at locations where inner radius changes. Reflections also occur at other discontinuities, such as air gaps and the pipe end, which seriously contaminate the measurement signals for PWT and pose challenges to PWT characterization. This study clarified the mechanism of reflections from different types of discontinuities using theoretical, analytical, and numerical solutions. By establishing a formula to calculate the characteristic impedance of a circular waveguide, we were able to analytically compute the scattering parameter <span><math><mrow><msub><mi>S</mi><mn>11</mn></msub></mrow></math></span> for a waveguide with a full-circumferential PWT, providing insights for PWT characterization. Furthermore, we defined the number of repetitions per unit of frequency as <span><math><mrow><mi>Ω</mi></mrow></math></span> and represented the measured <span><math><mrow><msub><mi>S</mi><mn>11</mn></msub></mrow></math></span> signals in the <span><math><mrow><mi>Ω</mi><mo>−</mo></mrow></math></span> domain. The correspondence between <span><math><mrow><mi>Ω</mi></mrow></math></span> and traveling distance enables localization of discontinuities without considering frequency-dependent propagation velocity. The <span><math><mrow><mi>Ω</mi></mrow></math></span> domain representations primarily associated with PWT were isolated by band and converted back to the frequency domain, allowing for more effective PWT characterization.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"149 ","pages":"Article 103269"},"PeriodicalIF":4.1000,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Comprehensive study on microwave inspection of internal pipe wall thinning: Discontinuities, reflections and signals\",\"authors\":\"Weiying Cheng\",\"doi\":\"10.1016/j.ndteint.2024.103269\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Microwave inspection of internal pipe wall thinning (PWT) relies on reflections occurring at locations where inner radius changes. Reflections also occur at other discontinuities, such as air gaps and the pipe end, which seriously contaminate the measurement signals for PWT and pose challenges to PWT characterization. This study clarified the mechanism of reflections from different types of discontinuities using theoretical, analytical, and numerical solutions. By establishing a formula to calculate the characteristic impedance of a circular waveguide, we were able to analytically compute the scattering parameter <span><math><mrow><msub><mi>S</mi><mn>11</mn></msub></mrow></math></span> for a waveguide with a full-circumferential PWT, providing insights for PWT characterization. Furthermore, we defined the number of repetitions per unit of frequency as <span><math><mrow><mi>Ω</mi></mrow></math></span> and represented the measured <span><math><mrow><msub><mi>S</mi><mn>11</mn></msub></mrow></math></span> signals in the <span><math><mrow><mi>Ω</mi><mo>−</mo></mrow></math></span> domain. The correspondence between <span><math><mrow><mi>Ω</mi></mrow></math></span> and traveling distance enables localization of discontinuities without considering frequency-dependent propagation velocity. The <span><math><mrow><mi>Ω</mi></mrow></math></span> domain representations primarily associated with PWT were isolated by band and converted back to the frequency domain, allowing for more effective PWT characterization.</div></div>\",\"PeriodicalId\":18868,\"journal\":{\"name\":\"Ndt & E International\",\"volume\":\"149 \",\"pages\":\"Article 103269\"},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2024-11-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Ndt & E International\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0963869524002342\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CHARACTERIZATION & TESTING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ndt & E International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0963869524002342","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
Comprehensive study on microwave inspection of internal pipe wall thinning: Discontinuities, reflections and signals
Microwave inspection of internal pipe wall thinning (PWT) relies on reflections occurring at locations where inner radius changes. Reflections also occur at other discontinuities, such as air gaps and the pipe end, which seriously contaminate the measurement signals for PWT and pose challenges to PWT characterization. This study clarified the mechanism of reflections from different types of discontinuities using theoretical, analytical, and numerical solutions. By establishing a formula to calculate the characteristic impedance of a circular waveguide, we were able to analytically compute the scattering parameter for a waveguide with a full-circumferential PWT, providing insights for PWT characterization. Furthermore, we defined the number of repetitions per unit of frequency as and represented the measured signals in the domain. The correspondence between and traveling distance enables localization of discontinuities without considering frequency-dependent propagation velocity. The domain representations primarily associated with PWT were isolated by band and converted back to the frequency domain, allowing for more effective PWT characterization.
期刊介绍:
NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.