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Design and verification of a feedback control for thermostatized chamber
Fridrich, Martin ; Králík, Jan (referee) ; Řeřucha,, Šimon (advisor)
Temperature variations have a great influence on the accurate length measurement by laser interferometry. An environment with controlled temperature is important to characterize and compensate for these effects. This thesis is concerned with the implementation of feedback control for a test chamber to create this controlled environment. The first part is devoted to a survey of control techniques, the basic principles of laser interferometry, the CANopen communication protocol, and the current design of the thermostatic chamber used at the Department of Coherent Optics of the Institute of Scientific Instruments of the CAS. The next part describes the design of the new chamber, the creation of the control software, the implementation of the control, and its optimization using several methods. Finally, the thesis contains a characterization of the conditions in the chamber. Comparison with the original condition shows more than a twofold improvement in temperature stability and an almost threefold reduction in the environmental influences on the temperature inside of the chamber.
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