Laser-aided material identification for the waste sorting process

Heinz Haferkamp; Ingo Burmester; Kai Engel

doi:10.1117/12.171252

28 March 1994 Laser-aided material identification for the waste sorting process

Heinz Haferkamp, Ingo Burmester, Kai Engel

Proceedings Volume 2092, Substance Detection Systems; (1994) https://doi.org/10.1117/12.171252
Event: Substance Identification Technologies, 1993, Innsbruck, Austria

Abstract

The LZH has carried out investigations in the field of rapid laser-supported material- identification systems for automatic material-sorting systems. The aim of this research is the fast identification of different sorts of plastics coming from recycled rubbish or electronic waste. Within a few milliseconds a spot on the sample which has to be identified is heated with a CO₂ laser. The different and specific chemical and physical material properties of the examined sample cause a different temperature distribution on the surface which is measured with an IR thermographic system. This `thermal impulse response' has to be analyzed by means of a computer system. The results of previous investigations have shown that material identification of different sorts of plastics can possibly be done at a frequency of 30 Hz. Due to economic efficiency, a high velocity identification process is necessary to sort huge waste currents.

Citation Download Citation

Heinz Haferkamp, Ingo Burmester, and Kai Engel "Laser-aided material identification for the waste sorting process", Proc. SPIE 2092, Substance Detection Systems, (28 March 1994); https://doi.org/10.1117/12.171252

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