Table 1.
Different kind of filaments employed for printing the sheets.
Fig 1.
a) TD-NIRS probe; b) DCS probe (FILOALFA); c) probe’s schematic.
Fig 2.
Extinction coefficient μ spectra in the wavelength range 400–1300 nm for two black PLA filaments (3DiTALY, dashed line; FILOALFA solid line).
Fig 3.
Extinction coefficient μ spectra in the wavelength range 400–1300 nm for PLA filament with different colors from the same producer (MDKOEM).
a) opaque colors; b) transparent colors; c) metal gray and blue.
Fig 4.
Extinction coefficient μ spectra in the wavelength range 400–1300 nm for PLA filaments with different colors from diverse producers.
Fig 5.
Extinction coefficient μ spectra in the wavelength range 400–1300 nm for the white PLA filament from MDKOEM, printed at different extruder’s temperatures.
Fig 6.
Extinction coefficient μ spectra in the wavelength range 400–1300 nm for ABS filaments with different colors from diverse producers.
Fig 7.
TD-NIRS signals obtained with the two 3D printed probes tested on the PVC surface at 689 nm (RED) and 828 nm (IR).
In panel a) results are shown for probe printed with black 3DiTALY filament; in panel b) for probe printed with black FILOALFA filament.
Fig 8.
Photon counts obtained with the two 3D printed probes tested against a PVC (a) and METAL (b) surface. The dotted lines are the linear fit.
Fig 9.
DTOFs acquired on the calibration phantom with two probes printed with different PLA filaments.
Dashed line: 3DiTALY filament; solid line: FILOALFA filament. On the x-axis, the channels are the time bins of the time-correlated single-photon counting board used for the acquisitions: Each channel corresponds to 8 ps.
Table 2.
Average absorption (μa), reduced scattering (μ’s) coefficients and χ2 calculated over 30 repeated DTOFs acquired at 689 nm (RED) and 828 nm (IR) with two PLA probes.
Fig 10.
Intensity autocorrelation functions acquired with two probes printed with different PLA filaments: FILOALFA (solid line) and 3DiTALY (dashed line).