Abstract
In this research, we propose an improved algorithm of Acoustic Computerized Tomography to measure temperature distribution in rectangular space. Temperature distribution measurement is used in various fields, such as, air-conditioning control in offices, temperature control in greenhouse. If acoustic transducers are fixed, they are ordinarily arranged at equal intervals on a circle. However, it is difficult to take circular arrangements of transducers in the rectangular spaces. Thus, we devise to arrange the transducers on a rectangle. Therefore, a problem is occurs that projection data could not be obtained at equal angular intervals. To solve this problem, we propose non-uniform angular interval Back-Projection to weight the projection data with respect to its angular intervals. We confirm usefulness of the proposed method by numerical simulations. In the simulations, 24-acoustic transducers are arranged at equal intervals on a rectangle whose aspect ratio is two. By using the proposed method, the shape approaches to the given temperature distribution, and RMS error of the reconstructed distribution to the given distribution decreases about 25 % compared to the error of conventional CT.
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