Non-contacting on-line paper strength measuring system

Details Non-contacting on-line paper strength measuring system Non-contacting on-line paper strength measuring system

1989-06-01

1991-06-25

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73602, 73159, G01N 2918, G01H 500

Patent

active

050256653

ABSTRACT:
An on-line system that measures the strength of material within a web without contacting same is disclosed. Two laser sources having beams which impinge upon the web of material are positioned so that their respective beams are spaced a predetermined distance apart. The first laser source induces a radially propagating ultrasonic wave within the material. The ultrasonic wave causes the beam from the second laser source to be reflected and intercepted by a light sensor permitting the velocity of the wave and the strength of the material to be determined.

REFERENCES:
patent: 3952583 (1976-04-01), Rosati
patent: 4291577 (1981-09-01), Baum et al.
patent: 4622853 (1986-11-01), Leugers
patent: 4674332 (1987-06-01), Pace et al.
patent: 4833928 (1989-05-01), Luukkala et al.

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