Spectrum Generation: The spectrometer in an FTIR system measures the light that passes through the sample and the light that’s absorbed. It uses this information to create a spectrum, which is essentially a graph showing the different frequencies of infrared light absorbed by the sample. Data In...
Figure 4. FTIR Spectroscopy functional group correlation table Near-IR Spectroscopy The Near-IR portion of the electromagnetic spectrum falls between 4,000 to 12,800 cm-1. This region consists of overtones (two of the same vibrational modes occurring simultaneously) and combinations (two different ...
This method adopts the least square method to calculate the average trend of all spectrums of one type of MP and then randomly scales the distances between each MP spectrum and the average trend to augment the dataset; 2) Baseline based method (Bjerrum et al., 2017), which adds random ...
Increasing water content generally decreased the compressive modulus and strength of the foams. Higher water content led to a higher absorption at 1670 cm−1 in the FTIR spectrum due to the formation of urea. Higher isocyanate indices generally improved compressive strength, but high amounts led ...