Title:
ELECTROMAGNETIC ULTRASONIC FLAW DETECTION APPARATUS AND METHOD USING MAGNETIC STRAIN EFFECT
Document Type and Number:
Japanese Patent JP3299505
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an electromagnetic ultrasonic flaw detection apparatus which can save an elimination work for scales before measurements, has a superior durability without a mechanical vibration part, and can accurately detect a minute internal defect.
SOLUTION: This electromagnetic ultrasonic flaw detection apparatus has a probe 13 which is provided with a permanent magnet 22 or an electromagnet for applying a constant bias magnetic field in a direction nearly perpendicular to a surface layer 20 including magnetic components of a material 11, a thickness or an internal defect 12 of which is to be detected, and a transmitting- detecting coil 21 which applies a changing magnetic field to the surface layer part 20, thereby generating pulses of ultrasonic waves, and detects a change of a strain of the surface layer part 20 because of reflecting echoes of the ultrasonic waves as a change of the magnetic field.
Inventors:
Fuminori Kiyota
Yasuhiko Wakibe
Masaki Yamane
Jouichi Ando
Mark burgunder
Yasuhiko Wakibe
Masaki Yamane
Jouichi Ando
Mark burgunder
Application Number:
JP14224998A
Publication Date:
July 08, 2002
Filing Date:
May 08, 1998
Export Citation:
Assignee:
New Japan Nondestructive Inspection Co., Ltd.
International Classes:
G01B17/02; G01N29/04; (IPC1-7): G01N29/04
Domestic Patent References:
| JP5399989A | ||||
| JP62161048A |
Attorney, Agent or Firm:
Fujio Nakamae
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