Method for non-destructive detection and characterization of fla

Details Method for non-destructive detection and characterization of fla Method for non-destructive detection and characterization of fla

1980-10-30

1984-04-17

Tokar, Michael J.

Electricity: measuring and testing

A material property using electrostatic phenomenon

For flaw detection

324452, G01N 2760

Patent

active

044437641

ABSTRACT:
A method for the nondestructive testing and evaluation of insulating materials is disclosed. The method comprises applying an electrostatic charge pattern to one surface of the material; providing an electrode on a second surface opposite said one surface, said electrode being at an electrical potential lower than said one surface so that the electrostatic charge can decay through said material; allowing the charge pattern to decay for a predetermined period of time; and determining the residual charge pattern on said one surface after said period. The method preferably further comprises heating the material above room temperature which can enhance the results.

REFERENCES:
patent: 3866114 (1975-02-01), Johnston
patent: 4233562 (1980-11-01), Blythe
R. E. Collins, "Measurement of Charge Distribution in Electrets", Review of Scientific Instruments, vol. 48, No. 1, Jan. 1977, pp. 83-91.

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