Browsing by Subject "sensitivity matrix"

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Access status: Open Access ,
Metody wyznaczania map czułości dla systemu tomografii optycznej
(Wydawnictwa AGH, 2007) Przywarski, Rafał; Grudzień, Krzysztof; Romanowski, Andrzej; Rząsa, Mariusz R.; Wajman, Radosław
Image reconstruction is a first stage of deriving information about the industrial process state for majority of process tomography applications. Therefore, image preparation on the base of tomography modality-specific properties, is the most important step in phenomena investigation with use of tomography. For optical modality, visual properties of the medium present in an explored space is deployed. Measurement space are illuminated with a few beams of visible light rays, and after traveling through the examined region, the incident light is sensed with detectors. Based on differences in medium transparency level and some other phenomena like reflection, refraction, etc., the image corresponding to a given space. The process of image reconstruction utilizes the sensitivity matrix. The paper presents two methods of sensitivity matrix determination. The first one assumes the light rays to be segments. The other one makes an assumption of the fixed width of light beams. Both methods are using the concept of light tracking from source to detector. The comparison of both methods identifies advantages and disadvantages of the two solutions. The study was conducted with use of numerical simulation and multiphase (gas/liquid) flow experiments in vertical column.
Access status: Open Access ,
Nowa koncepcja czujnika tomografu pojemnościowego do badania przeciwprądowych przepływów gaz-ciecz
(Wydawnictwa AGH, 2006) Rząsa, Mariusz R.; Wajman, Radosław
A measurement system for gas-liquid counterflow investigation is presented. On account of the structure exceptionality of the process a new capacitance tomography sensor was designed. The border area of the sensor is characterized by the higher level of sensitivity as in classical solutions. A new capacitance transducer to frequency was also designed. In the paper the preliminary results obtained with the new measurement system are presented and discussed.