Invention Grant
- Patent Title: Eddy current inspection device, eddy current inspection probe, and eddy current inspection method
- Patent Title (中): 涡流检测装置,涡流检测探头和涡流检测方法
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Application No.: US13787953Application Date: 2013-03-07
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Publication No.: US09274085B2Publication Date: 2016-03-01
- Inventor: Hisashi Endo , Akira Nishimizu , Noriyuki Sadaoka
- Applicant: Hitachi, Ltd.
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- Priority: JP2012-061918 20120319
- Main IPC: G01N27/87
- IPC: G01N27/87 ; G01N27/90 ; G01R33/385

Abstract:
Provided is an eddy current inspection device, an eddy current inspection probe and an eddy current inspection method that make it possible to detect defects existing in deeper parts of test objects. Three or more odd number of excitation coils are arranged at even intervals in a circumferential direction on a postulated circumference. Excitation currents applied to the excitation coils are controlled so that the phase difference between excitation currents applied to adjacent ones of the excitation coils arranged in the circumferential direction on the postulated circumference equals one cycle divided by the number of excitation coils. A magnetic field generated according to an eddy current occurring in the test object due to a magnetic field caused by the application of the excitation currents to the excitation coils is detected by use of a detector arranged on a postulated plane containing the postulated circumference but inside the postulated circumference.
Public/Granted literature
- US20130241541A1 Eddy Current Inspection Device, Eddy Current Inspection Probe, and Eddy Current Inspection Method Public/Granted day:2013-09-19
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