Apparatus and method of non-destructively testing ferromagnetic

Details Apparatus and method of non-destructively testing ferromagnetic Apparatus and method of non-destructively testing ferromagnetic

1990-01-29

1992-06-16

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324216, 324241, 324260, G01N 2787, G01N 2784, G01R 3312, G01R 33025

Patent

active

051227436

ABSTRACT:
Apparatus for measuring flux density within the surface of a ferromagnetic material (24) includes a probe (10) having an end for location on or adjacent the surface of the material (24), a first sensor at the said end of the probe (10) and capable of producing a first output signal representative of the strength of the magnetic field to which said first sensor is subjected, and a second sensor at the remote end of the probe (10) and capable of producing a second output representative of the strength of the magnetic field to which said second sensor is subjected. An electronic circuit produces a difference signal representing the difference between the first and second outputs, and an output device (14) displays and/or records said difference signal (16). The probe (10) preferably includes two magnetically susceptible C-cores (18, 20) and a coil (22) wound in one rotational sense on the crosspiece of one core (18) and in the opposite rotational sense on the crosspiece of the other core (20) to produce the difference signal. The magnetic flux can be measured for materials subjected to static or time-varying magnetic fields.

REFERENCES:
patent: 2957129 (1960-10-01), Irwin
patent: 3246219 (1966-04-01), Devol et al.
patent: 3617874 (1971-11-01), Forster
patent: 4270088 (1981-05-01), Weischedel
patent: 4430615 (1984-02-01), Calvert
patent: 4901015 (1990-02-01), Pospischil et al.
McMaster, R. C.; Thickness Tests, Non-Destructive Testing Handbook, vol. II; The Ronald Press, 1963; pp. 34.15-34.18.

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