Method of measuring the pitch of twisted threads

Details Method of measuring the pitch of twisted threads Method of measuring the pitch of twisted threads

1975-05-05

1977-02-22

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356111, G01B 902

Patent

active

040089649

ABSTRACT:
The pitch of twisted threads are measured by illuminating the threads with monochromatic light, especially a laser, to throw on a receiving surface a diffraction image from which the pitch is evaluated, preferably automatically by optical scanning and computing.

REFERENCES:
patent: 3709610 (1973-01-01), Kruegle
patent: 3804529 (1974-08-01), Hansler

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