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

G - Physics

01

N

349/35

G01N 33/36 (2006.01) G01N 21/00 (2006.01) G01N 29/07 (2006.01) G01N 29/24 (2006.01)

Patent

CA 2011912

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.

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