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Optical tomography for solid gas measurement using mixed projection

Mohd Muji , Siti Zarina (2012) Optical tomography for solid gas measurement using mixed projection. PhD thesis, Universiti Teknologi Malaysia.

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Optical tomography is widely known in tomography area to visualise and measure mass flow rate of two phases flows solid gas. In order to visualise the material inside the pipeline, parallel beam projection had been selected at all times because of its simplicity. However while producing the image, some constraints such as smear and blurriness will happen, whereas for mass flow rate, the measurement of a non-homogenous flow will always affect the accuracy of the result. Therefore, a combination between parallel and fan beam was done to produce a better spatial resolution. This research introduces a new projection technique by mixing the parallel and fan beam projections that is, Mix Modality between Parallel and Fan Beam Left and Right (MPFBLR), and Mix Modality between Parallel and Fan Beam Centre (MPFBC). These mixed projections need a specific design of a sensor jig by eliminate the collimator to enable two modes of projections to be operated and consequently, this combination will use switching/pulsing technique. Linear Back Projection (LBP) is the algorithm that will be used to reconstruct the image in real time. The image will be processed offline to filter unwanted data, and to enhance quality using Filtered Back Projection (FBP) with Averaging Grouping Color (AGC) method and Linear Back Projection with Interpolation (LBPI). A new technique using polynomial graph acquired from calibration process of gravity flow rig will be employed to measure the mass flow rate. The result demonstrated that MPFBLR gave the best values in terms of Area Error (AE) percentage, Peak Signal to Noise Ratio (PSNR) and Normalized Mean Square Error (NMSE) compared to single parallel beam projection. The mass flow rate can be easily monitored using polynomial equation from the manual calibration. In conclusion, the combination technique between parallel and fan beam can improve the image quality and enable the mass flow rate measurement.

Item Type: Thesis (PhD)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Depositing User: Normajihan Abd. Rahman
Date Deposited: 30 Dec 2013 08:35
Last Modified: 30 Dec 2013 08:35
URI: http://eprints.uthm.edu.my/id/eprint/4658
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