Method of measuring orientation of sheet or web like material

Details Method of measuring orientation of sheet or web like material Method of measuring orientation of sheet or web like material

1987-01-30

1988-11-01

Yasich, Daniel M.

Measuring and testing

Sheet, woven fabric or fiber

324 585C, G01N 2200

Patent

active

047810637

ABSTRACT:
A method of measuring the orientation of the constituents of specimens is disclosed, which includes the steps of preparing a cavity resonator in the form of a pair of waveguides forming a cavity, said waveguides being formed with a slit, inserting a specimen sheet or web in said slit, oscillating said cavity resonator by microwaves of fixed frequency while producing a relative rotation between said inserted specimen sheet or web and the plane of microwaves of the cavity resonator, measuring the amount of attenuation of the output signal or transmitted microwave intensity from said cavity resonator with respect to said exciting input signal, and measuring the orientation from the relation between said amount of attenuation or transmitted microwave intensity and the angle of said specimen sheet with respect to the cavity resonator, said method being characterized in that the oscillation frequency of said microwaves is set shifted slightly toward the higher side from the resonance frequency of the cavity resonator as measured when the specimen sheet or web is inserted in the slit and held therein at an arbitrary angle relative to the cavity resonator.

REFERENCES:
patent: 2457695 (1948-12-01), Liskow
patent: 2548598 (1951-04-01), Feiker
patent: 3144601 (1964-08-01), Slabodsky
patent: 3538434 (1970-11-01), Brown
patent: 4087746 (1978-05-01), Kanae
patent: 4257001 (1981-03-01), Partain
patent: 4381485 (1983-04-01), Steinbrecher
patent: 4492915 (1985-01-01), Caspers
patent: 4581575 (1986-04-01), Osaki et al.
Tappi Standard T481 SM-60, Suggested Method--1952, Revised--1960, "Fiber Orientation and Squareness of Paper".

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