Apparatus for inspecting degradation/damage of a material using

Details Apparatus for inspecting degradation/damage of a material using Apparatus for inspecting degradation/damage of a material using

1991-09-11

1994-07-19

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324248, 324240, G01N 2772, G01R 3312, G01R 33035, G21C 17003

Patent

active

053312783

ABSTRACT:
A non-destructive inspection apparatus includes a magnetic field applying device and a magnetic sensor. The magnetic field applying device is adapted to apply DC and AC magnetic fields to an object to be inspected. Degradation/damage of the object is detected by measuring a magnetic characteristic of the object in a state in which the DC and AC magnetic fields are applied. Also, a non-destructive inspection apparatus includes as a magnetic sensor a plurality of pickup coils and a SQUID(s) connected to the pickup coils and decides the form of a defect of an object to be inspected by producing a difference between outputs of the pickup coils or SQUIDs.

REFERENCES:
patent: 2346830 (1944-04-01), DeLanty
patent: 3281666 (1966-10-01), Mahino
patent: 3588683 (1971-06-01), Lloyd

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