Study of two-dimensional inspection of thin sheets using Lamb wave
The Lamb wave inspection technique with a tire transducer has been used for the on-line defect inspection of steel sheets. However, the conventional Lamb wave inspection process has the following two problems. One is the existence of wide dead zones that appear in the near and far positions for the...
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| Veröffentlicht in: | Acoustical Science and Technology 2002, Vol.23(1), pp.47-49 |
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| creator | Murayama, Riichi Nakamura, Masahiro Yamano, Masaki Ookubo, Hiroyuki |
| description | The Lamb wave inspection technique with a tire transducer has been used for the on-line defect inspection of steel sheets. However, the conventional Lamb wave inspection process has the following two problems. One is the existence of wide dead zones that appear in the near and far positions for the tire transducer. The other is misdetection due to parasitic echoes or electrical noises. Therefore, we have developed a method that could solve these problems using the two-dimensional signal characteristics. As a result, the dead zone and the misdetections can be reduced. This paper describes the measurement principle, the algorithm of the signal processing and the distinction logic. The results showed that the dead zone was reduced to 100 mm from the strip edge and the misdetection was eliminated. |
| doi_str_mv | 10.1250/ast.23.47 |
| format | Article |
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However, the conventional Lamb wave inspection process has the following two problems. One is the existence of wide dead zones that appear in the near and far positions for the tire transducer. The other is misdetection due to parasitic echoes or electrical noises. Therefore, we have developed a method that could solve these problems using the two-dimensional signal characteristics. As a result, the dead zone and the misdetections can be reduced. This paper describes the measurement principle, the algorithm of the signal processing and the distinction logic. The results showed that the dead zone was reduced to 100 mm from the strip edge and the misdetection was eliminated.</description><identifier>ISSN: 1346-3969</identifier><identifier>EISSN: 1347-5177</identifier><identifier>DOI: 10.1250/ast.23.47</identifier><language>eng</language><publisher>Tokyo: ACOUSTICAL SOCIETY OF JAPAN</publisher><subject>Lamb wave ; Thin steel sheet ; Tire transducer ; Two-dimensional inspection ; Ultrasonic inspection</subject><ispartof>Acoustical Science and Technology, 2002, Vol.23(1), pp.47-49</ispartof><rights>2002 by The Acoustical Society of Japan</rights><rights>Copyright Japan Science and Technology Agency 2002</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4527-6435ce7f3cbf6f397f601eca1fa3aa6011b80a901889bb83d923419df2d4f5bb3</citedby><cites>FETCH-LOGICAL-c4527-6435ce7f3cbf6f397f601eca1fa3aa6011b80a901889bb83d923419df2d4f5bb3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,1877,4010,27904,27905,27906</link.rule.ids></links><search><creatorcontrib>Murayama, Riichi</creatorcontrib><creatorcontrib>Nakamura, Masahiro</creatorcontrib><creatorcontrib>Yamano, Masaki</creatorcontrib><creatorcontrib>Ookubo, Hiroyuki</creatorcontrib><title>Study of two-dimensional inspection of thin sheets using Lamb wave</title><title>Acoustical Science and Technology</title><addtitle>Acoustical Science and Technology</addtitle><description>The Lamb wave inspection technique with a tire transducer has been used for the on-line defect inspection of steel sheets. However, the conventional Lamb wave inspection process has the following two problems. One is the existence of wide dead zones that appear in the near and far positions for the tire transducer. The other is misdetection due to parasitic echoes or electrical noises. Therefore, we have developed a method that could solve these problems using the two-dimensional signal characteristics. As a result, the dead zone and the misdetections can be reduced. This paper describes the measurement principle, the algorithm of the signal processing and the distinction logic. 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However, the conventional Lamb wave inspection process has the following two problems. One is the existence of wide dead zones that appear in the near and far positions for the tire transducer. The other is misdetection due to parasitic echoes or electrical noises. Therefore, we have developed a method that could solve these problems using the two-dimensional signal characteristics. As a result, the dead zone and the misdetections can be reduced. This paper describes the measurement principle, the algorithm of the signal processing and the distinction logic. The results showed that the dead zone was reduced to 100 mm from the strip edge and the misdetection was eliminated.</abstract><cop>Tokyo</cop><pub>ACOUSTICAL SOCIETY OF JAPAN</pub><doi>10.1250/ast.23.47</doi><tpages>3</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 1346-3969 |
| ispartof | Acoustical Science and Technology, 2002, Vol.23(1), pp.47-49 |
| issn | 1346-3969 1347-5177 |
| language | eng |
| recordid | cdi_proquest_journals_1448255080 |
| source | J-STAGE Free; Freely Accessible Japanese Titles |
| subjects | Lamb wave Thin steel sheet Tire transducer Two-dimensional inspection Ultrasonic inspection |
| title | Study of two-dimensional inspection of thin sheets using Lamb wave |
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