Method and apparatus for detecting surface flaws in electrical cable plastic jacketing

This invention employs principles associated with air-lubricated thrust bearings, to provide highly sensitive indicators of the presence of defects along the surface of a cable insulative layer (11). A spring-loaded mounted probe (21) containing an axial air passage (23) is closely directed at the c...

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Bibliographic Details
Main Author LAGROTTA, RICHARD THOMAS
Format Patent
LanguageEnglish
French
German
Published 23.01.1991
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
PHYSICS
TESTING
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Summary:This invention employs principles associated with air-lubricated thrust bearings, to provide highly sensitive indicators of the presence of defects along the surface of a cable insulative layer (11). A spring-loaded mounted probe (21) containing an axial air passage (23) is closely directed at the cable surface (11). The cable (10) is moved linearly under the probe (21), and air is introduced to create air flow at and along the surface in the vicinity of the probe's outlet oriface. The static pressure at the probe outlet oriface is essentially constant, until a surface defect such as a scratch or a protrusion causes a substantial change in the air pressure or air flow rate. The change is detected and recognized as an indication of defect.
Bibliography:Application Number: EP19900304252