Non-destructive detection of voids in plastic materials

Details Non-destructive detection of voids in plastic materials Non-destructive detection of voids in plastic materials

1984-08-20

1986-10-28

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 72, 324456, G01N 2761, G01N 2762, G01N 2742

Patent

active

046201459

ABSTRACT:
A sensitive yet non-destructive method and apparatus for detecting the presence of voids contained within dielectric materials is disclosed which comprises applying a voltage across the dielectric material to create an electric field therethrough, increasing this voltage to create a partial electrical discharge and monitoring the field current to detect the voltage at which partial discharge occurs. When the partial discharge is detected, the voltage applied across the test material is recorded. Reference can then be made to mathematical charts and formulas readily available to determine the size and shape of the detected void.

REFERENCES:
patent: 4259666 (1981-03-01), Takahashi
patent: 4262254 (1981-04-01), Poss

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