Measuring the speed of ultrasound in a moving web of paper

Details Measuring the speed of ultrasound in a moving web of paper Measuring the speed of ultrasound in a moving web of paper

G - Physics

01

H

349/31

G01H 5/00 (2006.01) D21F 7/00 (2006.01) D21G 9/00 (2006.01) G01N 29/00 (2006.01)

Patent

CA 1288858

ABSTRACT The invention provides apparatus and methods for producing and communicating low-noise signals that, when combined with known distances between a first transducer and each of a plurality of second transducers, enable measurement of the speed of ultrasound in a moving web of paper. The invention employs a hollow cylinder having electronic circuitry in its interior. The first and second transducers are disposed in the cylinder and have portions which protrude above the surface of the cylinder for contact with the web. The first transducer receives electrical pulses and delivers corresponding ultrasonic pulses to the web that propagate through the web and are received by the second transducers. The second trans- ducers then deliver corresponding electrical signals which correlate with the speed of ultrasound in the web and may be communicated to receptors which are external to the cylinder. The communicated signals may be further conditioned and processed to produce a measurement of the speed of ultrasound in the web.

536740

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