Fourier transform infrared (FTIR) spectrophotometers detect infrared light transmitted through or reflected from samples and then apply a Fourier transform process to identify wavelength components. They are especially well-suited for identifying or quantitating substances or for predicting chemical structures.
On production lines, for example, FTIR systems are typically used to identify plastic contaminants in order to infer how the contamination occurred or to prepare countermeasures. However, thermal and UV degradation can prevent correct identification of plastics because the degradation changes their FTIR spectra.
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