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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Dent Mater. 2014 Nov 21;30(12):1316–1324. doi: 10.1016/j.dental.2014.09.006

Fig. 2.

Fig. 2

a) The absorption spectra of uncured TPH collected using the D-NIR and FT-IR instruments with two different coadded scan numbers (Δt, the average time span for collecting one spectrum). The level of noise in the D-NIR spectrum was reduced relative to that in the FT-IR spectrum using 2 scans and 8 resolution. b) The absorption spectrum of TPH during polymerization collected by real-time D-NIR at various intervals (t, the real time after irradiation starts). Absorptions associated with the methacrylate =CH2 bonds (first overtone) are highlighted by asterisks at 6165 cm−1.