Method and apparatus for monitoring state of polymeric materials
US5170667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1990 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Dec 4, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0421
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic wave is emitted from an ultrasonic wave transducer for transmission to polymeric materials and received by an ultrasonic wave transducer for reception arranged at a predetermined distance away from the transducer for transmission. A propagation time of the ultrasonic wave and the level of the reception wave are measured during the process to heat or cool the polymeric materials. A state of the polymeric materials is discriminated on the basis of a characteristic curve which is determined by the propagation time and the reception wave level of the ultrasonic wave. In the case of measuring an asphalt paved road, when shoulder characteristics appear on the characteristic curve which is determined by the propagation time of the ultrasonic wave and the reception wave level, it is determined that a solid state in which a traffic lane can be opened was obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.