Secara umumnya, objektif projek ini adalah untuk mengimplimentasi teknik sinaran berbilang “fan beam†menggunakan penderia gentian optik dengan tujuan meningkatkan kadar perolehan data. Teknik sinaran berbilang “fan beam†dalam kes ini boleh didefinisikan sebagai membenarkan lebih daripada satu pemancar untuk memancarkan cahaya dalam suatu masa yang sama dengan menggunakan kaedah “switch–mode fan beam.â€
Kata kunci: Penderia gentian optik, tomografi optik fan–beam, teknik berbilang pemancar, kaedah switch–mode fan beam
This paper investigates the acquisition rate for a multi–projection technique using optical fibre sensors for a fan beam optical tomography system. The multi–projection technique allows more than one emitter to project light at the same time. For the 32 pairs of sensors used, the 2–projection technique is being investigated whereby 16 sets of projections will complete one frame of light emission. Compared to the conventional single light projection technique used in switch–mode fan beam, multiple light projections technique has shown to be able to achieve a higher data acquisition rate.
Key words: Optical fibre sensor, fan beam optical tomography, multi–projection technique, switch–mode fan beam method
We describe the development of a tomographic system by employing low-cost optical sensors. This sensor selection aims at producing a low-cost solution in visualizing a low dense solid particle conveyor system. The final aim of this project is to achieve real-time monitoring of solid particles having low concentration flow when being conveyed in a vertical pneumatic conveyor. The developed tomography system consists of 32 pairs of light-emitting diodes (LEDs) and silicon PIN photodiodes. These sensors are used to monitor the emitted radiation for fluctuations caused by particles interfering with the beam when passing through it. Each sensor output depends on the position of flow regime within the sensing zone. The relationships between the particle distribution and light attenuation effects are investigated by reconstructing the cross-sectional image through computer programming. A data acquisition system is used to digitalize analog signals from the sensor system and is manipulated by a personal computer in real-time mode. The results obtained from this investigation show that low-cost optical sensors are suitable for monitoring low and medium concentration flowing materials.
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