Sonic measurement of web tension
US4335603A · kind A · utility
13Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1980 |
| Grant date | Jun 22, 1982 |
| Priority date | — |
| Expiry date | Aug 13, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L5/042
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.