Interação da luz laser para a avaliação da textura de madeiras nativasE de Eucalyptus grandis W. Hill ex Maiden

Mara Rubia Silva; Fábio Akira Mori; Giovanni Francisco Rabelo; Roberto Alves Braga

Interação da luz laser para a avaliação da textura de madeiras nativasE de Eucalyptus grandis W. Hill ex Maiden

2005

Mara Rubia Silva | Fábio Akira Mori | Giovanni Francisco Rabelo | Roberto Alves Braga

This work had the objective of study in patterns of the speckle as function of the wood texture ofBowdichia virgilioides (sucupira), Swietenia macrophylla (mogno), Balfourodendron riedelianum (paumarfim)and Eucalyptus grandis wood. The He-Ne laser 10 mW was used to illuminate the wood samplesand a digital camera captured the result of the interaction of the wood with the laser light. The resultsobtained from image analysis were compared with the pattern obtained by microscopic methodology. Thecaptured images show the intensities of each pixel, varying between 0 and 255 in the gray scale. From theimages, a central area of 16x16 pixels was removed and analyzed by the application of the convolutionfunction and its Fourier Transform, resulting in the power density spectrum. The results showed that theinformation obtained by the power density spectrum of the speckle space variation allow classing samplesof woods with different texture.

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