J. Phys. IV France 125 (2005) 857-860
Photoacoustic spectroscopy and thermal relaxation method to evaluate corn moisture contentF. Pedrochi1, A.N. Medina1, A.C. Bento1, M.L. Baesso1, M.L.S. Luz2 and V.A. Dalpasquale2
1 Departamento de Física, Universidade Estadual de Maringá, Av. Colombo, 5790, 87020-900, Maringá, PR, Brazil
2 Departamento de Agronomia, Universidade Estadual de Maringá, Av. Colombo, 5790, 87020-900, Maringá, PR, Brazil
In this study, samples of popcorn with different degrees of moisture were analyzed. The optical absorption bands at the mid infrared were measured using photoacoustic spectroscopy and were correlated to the sample moisture. The results were in agreement with moisture data determined by the well known reference method, the Karl Fischer. In addition, the thermal relaxation method was used to determine the sample specific heat as a function of the moisture content. The results were also in agreement with the two mentioned methods.
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