Sonic measurement of web tension

Details Sonic measurement of web tension Sonic measurement of web tension

1980-08-13

1982-06-22

Kreitman, Stephen A.

Measuring and testing

Sheet, woven fabric or fiber

73581, G01N 2900

Patent

active

043356036

ABSTRACT:
Tension in a moving web is measured by subjecting the web to an ultrasonic pulse train and measuring the time interval for the resultant transverse waves in the web to proceed a known distance past a point upstream (or downstream). The composite web plus wave velocity is calculated and the web travel time is added (or subtracted) to obtain wave velocity which is related to tension in accordance with the equation T=a.sup.2 w/g.sub.c, where T=web tension, a=wave velocity, w=mass per unit area and g.sub.c =lb mass ft/lb force sec.sup.2 conversion factor.

REFERENCES:
patent: 2661714 (1953-12-01), Greenwood, Jr. et al.
patent: 4073007 (1978-02-01), Boivin
patent: 4109520 (1978-08-01), Eriksson

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