Abstract-Process tomography is a technique to realize flow imaging in a process
Matlamat keseluruhan projek ini ialah untuk menyelidiki manfaat yang boleh diperoleh daripada sistem tomografi dwi ragam (optik dan elektrodinamik) untuk mengukur imej tomografi terhadap aliran pepejal. Penyelidikan ini melibatkan kajian ke atas pengagihan manikmanik plastik yang dialirkan dalam sebuah paip dengan memasang penderia–penderia optik dan elektrodinamik di sekeliling paip tanpa mengganggu aliran di dalam paip. Sistem tomografi dwi raga mini dibahagikan kepada dua bahagian, yang terdiri dari perkakasan dan perisian. Perkakasan optik direka bentuk menggunakan 32 BPX65 penderia foto diod yang bertindak sebagai penerima dan dua lampu halogen yang bertindak sebagai pemancar cahaya. Penderia–penderia ini diatur sebagai dua projeksi selari. Penderia–penderia elektrodinamik direka bentuk menggunakan 16 elektrod yang dipasang pada jarak yang sama di sekeliling dinding paip. Sistem tomografi ini mampu memaparkan agihan kepekatan objek di dalam paip. Kata kunci: Profil kepekatan; aliran dwi fasa; tomografi optic; infra–merah; aliran pepejal The overall aim of this project is to investigate the benefits of dual modality (optical and electrodynamics) tomography system for the measurement of tomographic images of solids flow. This research will investigate the distribution of conveying plastic beads in a conveying pipe by placing optical and electrodynamics sensors around the pipe without interrupting the flow inside the pipe. The dual modality tomography system is divided into two main parts, which are the development of hardware and software. Optical hardware is designed using 32 BPX65 photodiode sensors acting as receivers and two halogen bulbs acting as light transmitters. The sensors are arranged as two parallel projections. The electrodynamics sensors are designed using 16 electrodes positioned equidistantly around the periphery of the pipe wall. The tomography system is able to display the concentration profile of the objects inside the pipe. Key words: Concentration profiles; two phase flow; optical tomography; infra–red; solid flow
Matlamat kertas kerja ini ialah untuk membentangkan penyelidikan tentang penggunaan kaedah tomografi optik menggunakan penderia–penderia infra merah untuk pemantauan masa nyata terhadap zarah–zarah pepejal yang dialirkan oleh rig aliran graviti. Penderia terdiri daripada dua projeksi cahaya orthogonal dan dua projeksi cahaya melintang untuk membentuk deretan atas dan bawah menjadi empat projeksi selari. Penumpuan pancaran daripada satu sumber cahaya dan mengalirkannya melalui rejim aliran yang memastikan keamatan pancaran dikesan pada bahagian yang bertentangan disambungkan kepada agihan dan pekali serapan bagi fasa–fasa yang berbeza dalam laluan pancaran. Maklumat pada aliran yang diperolehi oleh penderia-penderia yang dipasang di bahagian atas dan bawah akan dijadikan dalam bentuk digital oleh sistem perolehan data sebelum ia dihantar ke sebuah computer untuk dianalisis untuk memaparkan keratan silang imej. Penyelidikan ini berjaya dikembangkan dan diuji menggunakan sebuah sistem tomografi infra merah untuk memaparkan kepekatan aliran dwi fasa dalam rig aliran gravity. Kata kunci: Profil kepekatan; aliran dwi fasa; tomografi optic; infra-merah; aliran pepejal The objective of this paper is to present research on the use of an optical tomography method using infra–red sensors for real–time monitoring of solid particles conveyed by a gravity flow rig. The sensor comprised two orthogonal and two diagonal light projections to form upstream and downstream arrays in a total of four parallel projections. Collimating the radiated beam from a light source and passing it through a flow regime ensures that the intensity of radiation detected on the opposite side is linked to the distribution and the absorption coefficients of the different phases in the path of the beam. The information on the flow captured using upstream and downstream infra-red sensors is digitized by the DAS system before it was passed into a computer to be analyzed in order to reconstruct the cross section image. This investigation successfully developed and tested an infra–red tomography system to profile the concentration of two phase flow in a gravity flow rig. Key words: Concentration profiles; two phase flow; optical tomography; infra–red; solid flow
In this paper, a novel fuzzy fusion method is proposed to combine the images obtained from dual modality (optical and electrodynamics) tomography sensors. The fuzzy rules designed are based on the features of each single mode sensor. Furthermore, the outcome of the proposed method is compared with the two mostly common image fusion methods; principal component analysis (PCA) and discrete wavelet transform (DWT). The fused image results of half flow and full flow solid/gas laboratory phantoms are presented in this paper. Matlab software was used to visualize and analyze the combined images. The results show that the proposed method has produces superior improvement in the quality of fused image for optical and electrodynamics dual mode tomography applications in the case of solid/gas flow.
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