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Computational Modeling of Photoacoustic Spectroscopy for Studies of Epoxy Resin Curing: T2F Method
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Abstract
In this work the method for determining thermal diffusivity of materials called Two-Beam Phase-Lag Technique (T2F), based on the photoacoustic effect, is numerically simulated. This simulation provides support to an experimental work, still ongoing, where a new method is proposed to monitor in real time epoxy resin curing. A designed cell with two photoacoustic chambers is expected to detect the phases of the photoacoustic signals due to front and rear illuminations, simultaneously. With this information, it is possible, by T2F technique, a continuous monitoring of the thermal diffusivity of an epoxy resin sample, under curing process. Therefore, the degree of crosslinking can also be monitored online. It is shown that the simulations are important for this study, especially to verify the adequacy of the experimental boundary conditions required by the theoretical model. As a result, it is found the set of allowed values for modulation frequencies, sample thickness and optical absorption coefficient, in which the experiments should be carried out. An experimental result of preliminary tests is shown, where the performance of the thermal diffusivity measurements with the proposed methodology is discussed.
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