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Moisture Measurements
Hřib, Jan ; Pikula, Stanislav (referee) ; Beneš, Petr (advisor)
This bachelor’s thesis deals with measuring moisture in building materials and it is focused on the capacitive and microwave method. The goal was to find out whether it is possible to employ these two methods to determine moisture distribution in the volume of a measured material. This thesis contains theoretical introduction to the moisture measurement. Practical experiments were made with both capacitive and microwave method. Capacitive method was supplemented with a simulation. Based on the results, I conclude that the capacitive method is not suitable to determine moisture distribution in the volume of a material. The same conclusion was reached in the case of the microwave method, although this conclusion was based more on the theory than on the measurements.
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Analysis of methods used for measurement of moisture in building materials
Hrabálková, Eliška ; Žák,, Antonín (referee) ; Šťastník, Stanislav (advisor)
The diploma thesis is focused on the issue of measuring the moisture content in building materials using indirect methods that allow its long-term measurement. The theoretical part of the thesis provides an overview of the forms of moisture in porous building materials and provide an overview of the principles of measuring moisture content. In the experimental part of the thesis, the aim is to verify the available methods for long-term monitoring of moisture in building materials built into building structures. Proven methods of measuring humidity include resistance, capacitive and microwave methods and their comparison with the results of gravimetric measurements. At the end of the work is an evaluation of knowledge and recommendations for further research in this area.
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Analysis of methods used for measurement of moisture in building materials
Hrabálková, Eliška ; Žák,, Antonín (referee) ; Šťastník, Stanislav (advisor)
The diploma thesis is focused on the issue of measuring the moisture content in building materials using indirect methods that allow its long-term measurement. The theoretical part of the thesis provides an overview of the forms of moisture in porous building materials and provide an overview of the principles of measuring moisture content. In the experimental part of the thesis, the aim is to verify the available methods for long-term monitoring of moisture in building materials built into building structures. Proven methods of measuring humidity include resistance, capacitive and microwave methods and their comparison with the results of gravimetric measurements. At the end of the work is an evaluation of knowledge and recommendations for further research in this area.
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Monitoring dynamiky půdní vlhkosti v agroekosystému
Bednařík, Martin
The aim of my thesis was to monitor and analyse the dynamics of soil moisture (Θ) through the gravimetric method using Kopecky's physical rollers (KFV) and the capacitance method using Theta Probe ML2x (FDR) and CS616 (TDR) sensors. The measurement took place in the cadastral areas of the village Vícemelice and Polkovice. I conducted 10 parallel measurement campaigns of KFV and Theta Probe in Vícemilice and 4 in Polkovice. CS616 sensors were located stationary in both locations throughout the whole period and provided continual time series Θ. In Vícemilice, Theta Probe undervalued by 11.4 % compared to the KFV. The CS616 undervalued by 6.5 % compared to KFV and overvalued by 3.9 % Theta Probe. In Polkovice, Theta Probe undervalued by 1 % compared to KFV. The CS616 sensors systematically overvalued compared to the other two methods. It overvalued by 40.9 % compared to KFV and by 42.1 % compared to Theta Probe. Furthermore, the overvaluation was higher with a greater depth, while it was only 11 % at the top layer. Lastly, a survey of the suction pressure of soil water in relation to Θ was conducted near Vícemilice and the results of Θ measured by CS616 sensors were compared to the values simulated by SoilClim model which is one of the tools used to monitor water supplies in soil, in particular the occurrence of drought at the national level. Based on the results obtained in the framework of the submitted thesis, it can be stated that the indirect methods, in particular the Theta Probe, have proven to be useful tools for monitoring soil moisture. Compared to the destructive method, they represent significant time savings and, due to their accuracy, they can be recommended for drought monitoring, calibration of mathematical models, satellite imaging, or testing of a variety of hypotheses related to the water balance in scientific experiments.
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Moisture Measurements
Hřib, Jan ; Pikula, Stanislav (referee) ; Beneš, Petr (advisor)
This bachelor’s thesis deals with measuring moisture in building materials and it is focused on the capacitive and microwave method. The goal was to find out whether it is possible to employ these two methods to determine moisture distribution in the volume of a measured material. This thesis contains theoretical introduction to the moisture measurement. Practical experiments were made with both capacitive and microwave method. Capacitive method was supplemented with a simulation. Based on the results, I conclude that the capacitive method is not suitable to determine moisture distribution in the volume of a material. The same conclusion was reached in the case of the microwave method, although this conclusion was based more on the theory than on the measurements.
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