Method and apparatus for grading fibers

Details Method and apparatus for grading fibers Method and apparatus for grading fibers

1984-12-27

1986-04-15

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73160, 73602, G01N 2900

Patent

active

045819351

ABSTRACT:
The specification discloses a method for grading fibers in which a tone burst of sound having a known spatial frequency distribution is transmitted along a sound path through a sample of fibers. After the sound waves have passed through the sample, they are detected, and the detected sound waves are analyzed to determine their spatial frequency distribution which is indicative of the grade of the sample of fibers.

REFERENCES:
patent: 2538444 (1951-01-01), De Mars
patent: 2966057 (1960-12-01), Heller
patent: 3486369 (1969-12-01), Korzilius
patent: 3750461 (1973-08-01), Felix
patent: 3925850 (1975-12-01), Lytton
patent: 3984895 (1976-10-01), Grice, Jr.
patent: 4481820 (1984-11-01), Thomann

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