On line ultrasonic velocity gauge
US4291577A · kind A · utility
36Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1979 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Dec 3, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02854
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.