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Response time of thermometers
Novák, David ; Radil, Lukáš (referee) ; Foral, Štěpán (advisor)
The aim of the work is the analysis of the characteristics of resistive and termočlánkových sensors, the description of their principle, basic parameters, structural design and last but not least is probably the most important part of the work of the explanation, analysis and practical experiment to see the time constant of the sensor. In the first part of the thesis explains the basic concepts and principles of thermal quantities of phenomena. Then it is done the basic classification of methods of measuring temperature with the inclusion of the main points of the content of this work. The next section will deal with the main issues of the work. First comes an explanation of the nature of resistive sensors and is explained in the next chapter the principle of thermocouples. The following is the chapter on the construction of the sensors. Here is a design of the sensor for the dismantled the practical use in industry and in other applications.. In the next chapter is described in detail at the issue of the time constants of the sensor. This chapter contains not only an explanation of this concept, but also to derive equations for the description of sensor behavior important in changing the conditions of real traffic. The following is the part where they are dismembered influences affecting the time constant of the device. These effects can significantly affect the otherwise high accuracy thermometers mentioned above. The last chapter deals with practical measurement of time constants specified thermometers. The measurement was carried out in two different environments, in boiling water and warm air. The assessment of the results of the measurements showed that the time constant in an environment of boiling water is significantly smaller than in the case of hot air, and that for all of the measured objects.
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