The near-infrared (NIR) sensor detects the reflected light of material with wavelength in the range from 1100nm to 1900nm. Different types of plastic compounds, such as C-H, N-H, and O-H, will absorb and reflect Light differently and create a unique spectrum according to the materials chemical composition. These spectrums will be evaluated and classified for final plastic types sorting result.
NIR/SWIR wavelength range (1100nm~1900nm)
NIR sensor with reflected light path
Some basic material spectrums in NIR range
These samples show different material with different color, based on material types identified by the NIR spectrometry sensor.