Abstract
Ultrasound attenuation analysis has been demonstrated as a cheap, reliable method of identifying and characterizing polymeric materials and components, which can assist in the separation and reclamation of thermoplastics from polymer waste streams. Material-component broad band ultrasonic attenuation measurement and the measurement of the time of flight of an ultrasonic pulse, in either pulse echo or pulse through-transmission mode, can be combined to attain a signature of the material under investigation. The HL (Hull-Langton) signature is independent of component dimensions and hence is a powerful tool for the identification of components of complex shape where access to all surfaces may be restricted. The results presented demonstrate the ability of the technique to identify a range of different polymers, including reinforced materials.
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