Institute of Physics
Topic
Development of sensors and measuring electronics for transient methods for determining the thermal properties of materials
PhD. program
Physical Engineering
Year of admission
2025
Name of the supervisor
Ing. Vlastimil Boháč, CSc.
Contact:
Receiving school
Faculty of Electrical Engineering and Information Technology
Annotation
The characterization of the thermal properties of materials is the basic condition of their use in conjunction with their use in real conditions. Recently, we have noticed an increase in the number of non-stationary measuring methods based on the principle of dynamic temperature change. The transitional or dynamic methods use non-stationary temperature fields to characterize thermal transport and material parameters. Usually, the thermal response to the heat pulse generated by the heat source is monitored. The thermal response is registered out in two ways. Either at a certain distance from the heat source of the pulse or at the source/sensor site. Accordingly, we divide sensors into two-probe where the temperature is sensed by a thermocouple located outside the heat source and in the case of single-probe sensors, the temperature response is sensed by the heating element itself. So the thermal response to the heat disturbance in a form of the pulse or step-wise form of heat is scanned by a thermocouple located apart of the heat source, or by sensor that is the heater and thermometer in the same time. By applying the appropriate physical model, the thermal response parameters are sought by minimizing the parameters of thermal diffusivity and thermal conductivity and volume thermal capacity or specific heat capacity. The use of one-probe sensors and the development of methods and measuring instruments to investigate the thermal properties of materials is therefore an interesting and necessary step to improve experimental measuring techniques. The results of development of single-probe sensors and methods as well as construction of new measuring electronics will enable more efficient and applied research to solve the problem of heat transport problems for a wide range of new technologically interesting materials even in various industries industry.