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公开(公告)号：DE69635339T2
公开(公告)日：2006-07-06
申请号：DE69635339
申请日：1996-12-13
Applicant: EBARA CORP
Inventor： OHTANI TOSHIHIRO , OGI HIROTSUGU , HIRAO MASAHIKO
Abstract: An electromagnetic acoustic transducer is provided which comprises magnets and a sheet type coil unit. The magnets are permanent magnets or electromagnets to provide a static magnetic field to an object to be inspected. The coil unit includes a pair of spiral or meander coils of an electrically conductive material, sandwiched between upper and middle insulation sheet and middle and lower insulation sheet. The coils are used for transmission and reception, respectively. All the ends of the respective coils extend through throughholes formed through the upper and middle insulation sheets to the surface of the ultrasonic transducer, and are connected to external leads. The ends for earth are commonly connected to form a common ground terminal. The inspection system with the electromagnetic acoustic resonance which is a combination of resonant technique and a non-contact electromagnetic acoustic transducer can accomplish evaluating the absolute value of ultrasonic attenuation. The attenuation is highly sensitive to the accumulated fatigue damage, showing a maximum around 20 - 30% of the whole life. This system can assess the damage advance and predict the fatigue life of metals.
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公开(公告)号：DE68922397D1
公开(公告)日：1995-06-01
申请号：DE68922397
申请日：1989-12-21
Applicant: EBARA CORP
Inventor： OSADA NORIYUKI , HISABE YASUSHI , OHTANI TOSHIHIRO , KANAMORI TOSHIYA
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公开(公告)号：ES2071696T3
公开(公告)日：1995-07-01
申请号：ES90106941
申请日：1990-04-11
Applicant: EBARA CORP
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公开(公告)号：DE69017248D1
公开(公告)日：1995-04-06
申请号：DE69017248
申请日：1990-04-11
Applicant: EBARA CORP
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公开(公告)号：AT119306T
公开(公告)日：1995-03-15
申请号：AT90106941
申请日：1990-04-11
Applicant: EBARA CORP
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Patent Agency Ranking
公开(公告)号：DE69635339D1
公开(公告)日：2005-12-01
申请号：DE69635339
申请日：1996-12-13
Applicant: EBARA CORP
Inventor： OHTANI TOSHIHIRO , OGI HIROTSUGU , HIRAO MASAHIKO
Abstract: An electromagnetic acoustic transducer is provided which comprises magnets and a sheet type coil unit. The magnets are permanent magnets or electromagnets to provide a static magnetic field to an object to be inspected. The coil unit includes a pair of spiral or meander coils of an electrically conductive material, sandwiched between upper and middle insulation sheet and middle and lower insulation sheet. The coils are used for transmission and reception, respectively. All the ends of the respective coils extend through throughholes formed through the upper and middle insulation sheets to the surface of the ultrasonic transducer, and are connected to external leads. The ends for earth are commonly connected to form a common ground terminal. The inspection system with the electromagnetic acoustic resonance which is a combination of resonant technique and a non-contact electromagnetic acoustic transducer can accomplish evaluating the absolute value of ultrasonic attenuation. The attenuation is highly sensitive to the accumulated fatigue damage, showing a maximum around 20 - 30% of the whole life. This system can assess the damage advance and predict the fatigue life of metals.
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公开(公告)号：DE68922397T2
公开(公告)日：1995-12-21
申请号：DE68922397
申请日：1989-12-21
Applicant: EBARA CORP
Inventor： OSADA NORIYUKI , HISABE YASUSHI , OHTANI TOSHIHIRO , KANAMORI TOSHIYA
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公开(公告)号：DE69017248T2
公开(公告)日：1995-10-26
申请号：DE69017248
申请日：1990-04-11
Applicant: EBARA CORP
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公开(公告)号：ES2074071T3
公开(公告)日：1995-09-01
申请号：ES89123680
申请日：1989-12-21
Applicant: EBARA CORP
Inventor： OSADA NORIYUKI , HISABE YASUSHI , OHTANI TOSHIHIRO , KANAMORI TOSHIYA
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公开(公告)号：AT121852T
公开(公告)日：1995-05-15
申请号：AT89123680
申请日：1989-12-21
Applicant: EBARA CORP
Inventor： OSADA NORIYUKI , HISABE YASUSHI , OHTANI TOSHIHIRO , KANAMORI TOSHIYA
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