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Microwave frequency has the potential to assist and improve forest product industry in terms of quality and quantity. Consequently, it has been selected to perform non-destructive inspection on wood which is defected or contains resin internally. This paper describes an experiment to determine the relationship between the attenuation of microwave signals and the different diameters of the holes in tree trunks. This analysis can be used as a reference for an optimal setup for a new microwave tomography aimed at the inspection of valuable wood trunks.

Kertas kerja ini membincangkan algoritma alih yang digunakan dalam sistem tomografi optik. Sistem pengukuran terdiri daripada dua tatasusunan ortagon berjumlah 20 penderia optik. Masalah depan dimodelkan dengan menentukan pekali pelemahan optik bagi setiap piksel. Kemudiannya prinsip Lambert–Beer digunakan. Bagi masalah kebelakang sensitiviti matrik alih digunakan bagi mendapatkan pekali pelemahan optik bagi setiap piksel. Kata kunci: Algoritma alih, tomografi optik, buih This paper describes a transpose algorithm for use with an optical tomography system. The measurement system consisted of two orthogonal arrays, each having ten parallel views, resulting in a total of twenty sensors. The measurement section is divided into hundred equi–sized pixels. The forward problem is modelled by allocating an optical attenuation coefficient to each pixel. The attenuation of incident collimated light beams is then modelled using the Lambert–Beer law. The inverse problem is defined and the transpose of the sensitivity matrix is used to obtain an estimate of the attenuation coefficients in each pixel. The iterative method is investigated as a means of improving reconstructed image quality. Key words: Transponse algorithms, optical tomography, bubbles