Abstract
The photoacoustic signal decreased along the sedimentation direction of aluminum-epoxy composites due to the increase in effective thermal conductivity as aluminum volume fraction increases. Quantitative estimation of the aluminum volume fraction was made from the variation of the photoacoustic signals incorporating the Rosenc-waig-Gersho theory with the Maxwell–Garnet effective medium theory. The result was in excellent agreement with the result of quantitative image analysis to within 5%, which justifies the use of the photoacoustic method in determining the filler volume fraction in two-phase composites.
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