Inspection of elongated material

Details Inspection of elongated material Inspection of elongated material

1978-09-18

1980-12-16

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 93, 358106, 235 92PD, H04N 718

Patent

active

042401100

ABSTRACT:
Apparatus and method are described for inspecting elongated material such as strands, sheets, bundles or webs for the presence of surface irregularities, count of irregularities within a given length and angle of irregularities such as in the case of crimped fiber. A light source is used to form light areas and shadowed areas of the elongated material. A television camera produces a video signal of the light and shadowed areas and such signal is electronically analyzed with respect to number of alternating light and dark areas within a given length, and the relative widths of such light and dark areas, from which information can be obtained to confirm presence of irregularities, count or frequency, and angle. A filter is disclosed for removing relatively low frequency signals caused by unintentional shadowing from the useful signals so that the accuracy of the apparatus is improved.

REFERENCES:
patent: 3868478 (1975-02-01), Zeenkov
patent: 3873812 (1975-03-01), Stein
patent: 4140898 (1979-02-01), Gasser

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