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The Photoacoustic (PA) technique was used to investigate the structural properties (e.g. open porosity and permeability) of open-pore sintered glasses. This work demonstrates that the photoacoustic signal of open-pore sintered glasses, which are produced with different grain sizes and several degrees of open porosity, is sensitive to the morphology of the open-pore samples. The results obtained by the PA technique were related to results obtained by the Pressure Decay technique, and an excellent correlation was obtained. This demonstrates that PA technique, which is non-intrusive and non-destructive, is promising for application in analysis of porous ceramic structures, even if the sample is semi-transparent. A técnica fotoacústica (PA) foi usada para investigar as propriedades estruturais (isto é, porosidade aberta e permeabilidade) de filtros vítreos. Este trabalho demonstra que o sinal fotoacústico de filtros vítreos, os quais foram produzidos com diferentes tamanhos de grãos e vários graus de porosidade, é sensível à morfologia destes. Os resultados obtidos pela técnica PA foram relacionados com resultados de permeabilidade obtidos pela técnica de decaimento de pressão, resultando em uma ótima correlação. Isto demonstra que a técnica fotoacústica, a qual é não intrusiva e não destrutiva, é promissora para análise de estruturas cerâmicas porosas, mesmo sendo essas semi-transparentes

A new method to determine open porosity and permeability constants of open-pore sintered glasses by photoacoustic technique