Method and apparatus for monitoring state of polymeric materials

Details Method and apparatus for monitoring state of polymeric materials Method and apparatus for monitoring state of polymeric materials

1990-12-04

1992-12-15

Arana, Louis

Measuring and testing

Vibration

By mechanical waves

73599, G01N 924

Patent

active

051706679

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.

REFERENCES:
patent: 4312228 (1982-01-01), Wohltjen
patent: 4335613 (1982-06-01), Luukkala
patent: 4754645 (1988-07-01), Piche et al.

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