Application example
Fig 1. Raman spectra collected from ABS-white (top) and ABS-black (bottom) plastic standards. Acquisition times from 250–500 ms.
Identification of ABS is key in electronic waste recycling, as the material shares spectral features with other styrenic polymers in VNIR-SWIR (sensor most commonly used in the plastic recycling industry). Particularly, allows for the differentiation between ABS and PS polymers.
Identification of polymer fingerprints from signals acquired at fast acquisition times (maximum: 500 ms).
Successful use of recipes for signal acquisition of samples of the same plastic type, but with different colours (white-ABS vs black-ABS).
Acquisition of polymer-specific features in samples with white pigments and broad fluorescence bands (from 1600–2000 cm-1) -> ABS white
Acquisition of polymer-specific features in samples with black pigments and high absorption of excitation light, without damaging the material -> ABS black (500 ms acquisition time).
Highlight: measurement conditions suitable for real-time and dynamic settings short integration time and tunable laser power
Fig. 2. Raman spectra collected from HDPE-transparent (top) and HDPE-black (bottom) plastic standards. Acquisition time: 500 ms.
Identification of diagnostic HDPE-diagnostic features in both transparent and black standards.
HPDE transparent: no influence from the background materials are observed in the final spectra (this means that the presence of a conveyor belt or another dark-colour background doesn’t impact the signal collection.
HDPE black: depending on the amount of dark pigments and other absorbers, signal acquisition may be impacted (see low SNR for PE-2 feature). Still, the other PE-related fingerprints exhibited good SNR, which allow for identification of the polymer type even under limiting conditions.
Example for identification of semiconductor type (Si and 4H-SiC) using the RAMSES measurement head.
