On line ultrasonic velocity gauge

Details On line ultrasonic velocity gauge On line ultrasonic velocity gauge

1979-12-03

1981-09-29

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73639, 73159, 310334, G01N 2900

Patent

active

042915775

ABSTRACT:
A device which measures the velocity of ultrasonic waves in a moving web is provided. A pair of wheels is mounted for continuous surface contact with the paper and a transducer, which contacts the web on each revolution, is located in each wheel for relating electrical and mechanical signals. Timing means measures the time it takes a mechanical signal generated at the first wheel to reach the second wheel. Noise reducing and amplifying means are provided for effective operation.

REFERENCES:
patent: 2625035 (1953-01-01), Firestone
patent: 3850031 (1974-11-01), Schwenzfeier et al.
patent: 4202216 (1980-05-01), Bull et al.
E. P. Papadakis, "Ultrasonic Methods for Modulus Measurement in Paper", Tappi, vol. 56, No. 2, pp. 74-77, Feb. 1973.
M. T. Lu, "On Line Measurement of Strength Characteristics of a Moving Sheet", Tappi, vol. 58, No. 6, pp. 80-81, Jun. 1975.

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