Method and apparatus for non-contact hole eccentricity and diame

Details Method and apparatus for non-contact hole eccentricity and diame Method and apparatus for non-contact hole eccentricity and diame

1992-06-26

1994-08-16

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

32420716, 324262, 33543, G01B 728, G01B 520, G01N 2772, G01N 2790

Patent

active

053390318

ABSTRACT:
A method and apparatus for inserting an eddy current hole probe into a hole specimen and automatically moving the probe in two orthogonal (X, Y) directions in response to the impedance change of an eddy current coil located in the probe as a function of distance from the surface of the hole. The probe is centered in the hole by a system controller which operates to minimize the composite deviation value of the coil impedance. The diameter of the hole is then determined from the average impedance measurement. Following this, a plot of the hole eccentricity is generated by determining the impedance deviation from the average coil impedance value as a function of the angular rotation of the probe in the hole. Measurements of the hole eccentricity for a plurality of hole depths provides an indication of the hole eccentricity profile.

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NORTEC PS-4--Programmable Eddy Current Scanner, Staveley Instruments, Inc. (Fact Sheets--2 pages) No Month, 1987.
NDT-25L--Programmable Lab Eddyscope--Pushbutton Eddy Current Tester, NDT Technologies Inc. (Fact Sheets --4 pages) No Month, 1981.

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