Application of control algorithm in a sliding mode in spectrum measurement system and growing of crystals

Abstract

The algorithm in a sliding mode that can be used for adaptive temperature control of a heating system for spectrum measurement systems and growing of crystals is presented. This paper is aimed not only at stating and developing the results obtained in the sphere of discontinuous system design, but also at presenting these results in close correlation with the basic concepts, problems and methods of theoretical aspects of present day control theory. Implementation of this approach implies the knowledge of the conditions of the occurrence of sliding mode, for which purpose a sliding mode indicator has been developed. The Sliding Mode controller by means the Lab View graphical programming language under Windows 1998 environment is proposed. The controller program consist of the following separate blocks: the block for acquiring of data from the thermal point block; the programmer block (set points), which ensures the desired temperature profile and provides the linear dependent voltage (or temperature) of a few desired slot time of different duration; the block responsible for the knowledge of conditions of the occurrence of SM, the so-called indicator; the observer block, which identifications the state vector of the system; block of anticipatory compensation; block of PID regulator.