Method and apparatus for detecting and displaying irregularities

Details Method and apparatus for detecting and displaying irregularities Method and apparatus for detecting and displaying irregularities

1996-06-13

1999-08-24

Kemper, Melanie A.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

324263, G01N 2700

Patent

active

059436328

ABSTRACT:
An apparatus for detecting irregularities in a ferrous pipe includes a magnetizing coil for inducing a magnetic field in the ferrous pipe. Inspection sensors measure changes in the induced magnetic field and produce signals representative of those changes. An analog-to-digital converter digitizes the measured signals representing the changes in the induced magnetic field. A processor compares the signals to a threshold value, and, when a signal exceeds the threshold value, the processor stops the inspection process to locate an irregularity in the ferrous pipe. The processor further processes the signals according to frequency to classify the signals by type of irregularity in the ferrous pipe. A screen and/or printer displays the frequency processed signals according to type of irregularity in the ferrous pipe.

REFERENCES:
patent: 4602212 (1986-07-01), Hiroshima et al.
patent: 4934179 (1990-06-01), Biggerstaff
patent: 5140265 (1992-08-01), Sakiyama et al.
patent: 5256965 (1993-10-01), Nomura
patent: 5619136 (1997-04-01), Drury
patent: 5671155 (1997-09-01), Edens et al.

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