Measuring and testing – Vibration – By mechanical waves
Patent
1987-01-20
1988-04-05
Yasich, Daniel M.
Measuring and testing
Vibration
By mechanical waves
73639, 73159, 310336, G01N 2900
Patent
active
047350873
ABSTRACT:
An on-line instrument in rolling contact with a papermachine web determines the web's strength and elastic modulus properties by intermittently pulsed sonic waves transmitted through the traveling web mass between a full circle, piezoelectric transducer emitter and identical receiving transducers respectively displaced from the emitter along the MD and CD web axes. Transducer signals from the receivers are analyzed by cross-correlation function techniques relative to the original stimulation reference signal to isolate the desired data signal from integral noise.
REFERENCES:
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patent: 4291577 (1987-07-01), Baum et al.
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Hourani Michel J.
Wigsten Anders L.
Marcontell W. A.
Schmalz R. L.
Westvaco Corporation
Yasich Daniel M.
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