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Permittivity measurement of materials by coax probe
Ryba, Ivan ; Oppl, Ladislav (referee) ; Láčík, Jaroslav (advisor)
This thesis describes possibilities of measuring permittivity of various materials, especially with coaxial probe method. It describes character of measuring method, hardware requirements and how to calculate values from the measured. Objective of this thesis is to design measuring station for measuring permittivity of materials with coaxial probe including calibration set. Code in Matlab is also programmed and whole station is tested with known samples to discuss measurement accuracy.
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Complex Permittivity Measurement of Biological Tissue
Vorlíček, Jaroslav ; Oppl, Ladislav (advisor) ; Hozman, Jiří (referee)
This thesis deals with the measurement of complex permittivity of biological tissue as the default precondition for the design of thermo-therapeutic microwave applicators for hyperthermia oncology treatment, when for the valid simulations of electromagnetic field is necessary to know the dielectric parameters of the environment. There are described different approaches to measure complex permittivity, in particular the non-invasive method of measuring complex permittivity at the end of the coaxial cable. For this purpose two measuring probes have been designed, constructed and tested. The first one based on N-connector and the second based on the SMA-connector. Simulations of the probe's models were simulated in program SEMCAD 14 and double checked by CST MICROWAVE STUDIO 2009. The possibilities of measuring complex permittivity of biological tissue as a potential diagnostic imaging method are also discussed. Measurements in order to demonstrate the diagnostic potential of this method were first conducted on artificially created non-homogeneous agar phantom with added mixture of various dielectrics, followed by measurement of biological tissue in vivo.
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Complex Permittivity Measurement of Biological Tissue
Vorlíček, Jaroslav ; Hozman, Jiří (referee) ; Oppl, Ladislav (advisor)
This thesis deals with the measurement of complex permittivity of biological tissue as the default precondition for the design of thermo-therapeutic microwave applicators for hyperthermia oncology treatment, when for the valid simulations of electromagnetic field is necessary to know the dielectric parameters of the environment. There are described different approaches to measure complex permittivity, in particular the non-invasive method of measuring complex permittivity at the end of the coaxial cable. For this purpose two measuring probes have been designed, constructed and tested. The first one based on N-connector and the second based on the SMA-connector. Simulations of the probe's models were simulated in program SEMCAD 14 and double checked by CST MICROWAVE STUDIO 2009. The possibilities of measuring complex permittivity of biological tissue as a potential diagnostic imaging method are also discussed. Measurements in order to demonstrate the diagnostic potential of this method were first conducted on artificially created non-homogeneous agar phantom with added mixture of various dielectrics, followed by measurement of biological tissue in vivo.
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Permittivity measurement of materials by coax probe
Ryba, Ivan ; Oppl, Ladislav (referee) ; Láčík, Jaroslav (advisor)
This thesis describes possibilities of measuring permittivity of various materials, especially with coaxial probe method. It describes character of measuring method, hardware requirements and how to calculate values from the measured. Objective of this thesis is to design measuring station for measuring permittivity of materials with coaxial probe including calibration set. Code in Matlab is also programmed and whole station is tested with known samples to discuss measurement accuracy.
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