Ultrasonic density measurement
US4677842A · kind A · utility
10Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1986 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Jul 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02818
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The density of polyethylene is determined by measuring the velocity of ultrasound through the material. The determination of density is based on the correlation between the velocity of ultrasound in semi-crystalline materials and their density, and involves the measurement of time delays of a transmitted ultrasonic pulse from each of the front surface of the material the rear surface of the material and a reflector which are immersed in a liquid. Operating within a selected frequency range provides measurements of density while eliminating viscoelastic effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.