Title:
EDDY CURRENT DETECTING APPARATUS
Document Type and Number:
Japanese Patent JPS6021445
Kind Code:
A
Abstract:
PURPOSE: To contrive precision measurement of position and size of a flaw, by fractionnating range of inspection inside an object to be inspected.
CONSTITUTION: A position of penetrated eddy current in the direction of depth inside the object to be inspected through changing δ1, and δ2, by changing magnetic exciting frequency of oscillator for magnetic excitation or changing strength of DC magnetic field which magnetizes the object 3. On the other hand, by positioning in the direction of scanning through scanning of detecting coil 2, fractionation of inspection range S inside the object 3, measurements of position and size of flaw inside the object 3 can be accomplished.
Inventors:
KOBANAWA AKIRA
SUGIYAMA SAKAE
HIGUCHI SHINICHI
SUGIYAMA SAKAE
HIGUCHI SHINICHI
Application Number:
JP12796983A
Publication Date:
February 02, 1985
Filing Date:
July 15, 1983
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G01N27/90; (IPC1-7): G01N27/90
Attorney, Agent or Firm:
Akio Takahashi
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