Title:
METHOD AND DEVICE FOR MAGNETIC CRACK DETECTION
Document Type and Number:
Japanese Patent JPH04296648
Kind Code:
A
Abstract:
PURPOSE: To make a magnetic flux examination with high sensitivity without affecting capability of detecting defects by employing a highly sensitive magnetic sensor saturated with low magnetic flux in an intensive magnetic field.
CONSTITUTION: This is a method and device for inspecting defects by a leakage flux crack detection. A high density magnetic flux in spaces around a magnetic sensor S for detecting leakage flux is bypassed by a jig 1 of ferromagnetic body to lower magnetic flux around the magnetic sensor. Thus the magnetic sensor can be used in an intensive magnetic field, and defects can be inspected with high sensitivity since it has little effect on the magnetic flux passing through a material being tested.
Inventors:
NAKAMURA ETSUHISA
NAGANUMA YOICHI
MATSUOKA YOSHIAKI
NAGANUMA YOICHI
MATSUOKA YOSHIAKI
Application Number:
JP6314391A
Publication Date:
October 21, 1992
Filing Date:
March 27, 1991
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
G01N27/83; (IPC1-7): G01N27/83
Attorney, Agent or Firm:
Tomoyuki Yathata (1 outside)