Abstract
Noise frequently appears on FTIR-ATR spectra of a cured (meth)acrylic material during determination of its double bond conversion. The goals of this work were to investigate the source of the noise and to find an effective way to reduce it. Two methacrylate-based dental composites, one unfilled methacrylate resin blend, and one acrylate resin system were used as the materials to be tested. Uncured and visible light cured specimens were mounted on an FTIR-ATR and their IR spectra were taken. The characteristics of the spectra were analyzed along with those of other solids and liquids. It was found that the origin of the noise is IR absorption bands of water adsorbed on the surface of the solid specimens. Among several remedies, digital subtraction of the water absorption baseline is demonstrated to be a flexible, easy-to-implement, and time-saving method to reduce or even eliminate the noise of the sample spectrum. Noise reduction improves the quality of FTIR-ATR spectra and makes the measurement of double bond conversion more accurate.
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