Apparatus and method for detecting structural cracks using a mov

Details Apparatus and method for detecting structural cracks using a mov Apparatus and method for detecting structural cracks using a mov

1993-05-10

1996-01-16

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324323, 324242, G01N 2762, G01N 2772, G01R 3312

Patent

active

054850843

ABSTRACT:
A device for detecting hidden cracks in a structure includes a hand-held probe which is moved over the surface of the structure. The probe is connected to a computer terminal which also has connected thereto a monitor and a keyboard. Changes in the eddy currents in the underlying structure generates impedance changes in the coils of the probe. The resulting voltage values produce an image of the underlying structure and any cracks therein on the computer monitor. The system utilizes a number of procedures to compensate for liftoff problems, imbalance between coil channels, and differences in impedance reference values.

REFERENCES:
patent: 4864235 (1989-09-01), Tornblom
patent: 5047719 (1991-09-01), Johnson et al.

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