infrared nir spectrometer  (Hitachi Ltd)

Journal: Sensors (Basel, Switzerland)

Article Title: Machine Learning-Based Identification of Plastic Types Using Handheld Spectrometers

doi: 10.3390/s25123777

Figure Lengend Snippet: The three different spectroscopic methods compared in this research to identify plastic types 1–6. We measured plastic samples with ( a ) an integrating sphere, broadband source and high-resolution near infrared spectrometer (NIRS) from 1050–1950 nm, ( b ) the discrete illumination-based Plastic Scanner with LEDs ranging from 900 to 1800 nm (PScanner) and ( c ) an integrated photonics approach using the SpectraPod (SP) using broadband light providing spectral responsivity from 850 to 1700 nm. NIRS gives a high-resolution spectrum with 237 datapoints, the Plastic Scanner, a discrete spectrum with 8 points, while the SP gives 16 channels that each have a different responsivity, as given in . Below: Resin identification codes for plastic types used in this research.

Article Snippet: As depicted in a, we measured all samples using a near-infrared spectrometer with 237 wavelength bands (NIRS, Avaspec-NIR256-2.0TEC, Avantes, Apeldoorn, The Netherlands).

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Machine Learning-Based Identification of Plastic Types Using Handheld Spectrometers

doi: 10.3390/s25123777

Figure Lengend Snippet: Spectral reflectance measurements obtained with ( a , b ) NIR Spectrometer, ( c ) Plastic Scanner and ( d ) SpectraPod (Note: the SpectraPod integrates reflectance over multiple infrared bands as described in ). All measured spectra for a variety of plastic samples of different types (e.g., varying colors and opacity) are shown dimly in the background, and the mean of all measurements is given in a solid color corresponding to the legend. ( a ) Displays all NIRS data in one graph, and ( b ) shows the normalized spectra (mean = 1.0) with an offset to more clearly show the spectra.

Article Snippet: As depicted in a, we measured all samples using a near-infrared spectrometer with 237 wavelength bands (NIRS, Avaspec-NIR256-2.0TEC, Avantes, Apeldoorn, The Netherlands).

Techniques: