caa a22 4500 606172998 CHVBK 20210128100731.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s10921-015-0313-9 doi (NATIONALLICENCE)springer-10.1007/s10921-015-0313-9 Liu Linsheng Advanced Microwave & Optical NDT Techniques, Shuku-machi 807-2, 841-0052, Tosu, Japan aut Application of Microwave for Remote NDT and Distinction of Biofouling and Wall Thinning Defects Inside a Metal Pipe [Elektronische Daten] [Linsheng Liu] Wall-thinning and biofouling/biofilm defects inside metal pipes are frequently reported, and each occurrence will cause a discontinuity along the metal pipe, which can be taken as a circular waveguide of microwave. If their existence and detailed distribution are unknown in advance, evaluated results may become confusing due to their possible coexistence and then complicate the correct interpretation of signals. To solve this problem, both S11 and S21 parameters are measured using a vector network analyzer and two newly designed probes. This experimental approach is based on the fact that similar reflections of different kinds of defects would have different wavelength changes and/or energy attenuation. Characteristic signals of these two kinds of defects are comparatively studied to distinguish them and generalize the remote microwave NDE application. Springer Science+Business Media New York, 2015 Microwave nationallicence Nondestructive testing nationallicence Wall thinning nationallicence Biofilm and biofouling nationallicence Remote defect classification nationallicence Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/4(2015-12-01), 1-8 0195-9298 34:4<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0313-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0313-9 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Liu Linsheng Advanced Microwave & Optical NDT Techniques, Shuku-machi 807-2, 841-0052, Tosu, Japan aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/4(2015-12-01), 1-8 0195-9298 34:4<1 2015 34 10921