Measurement Circuit Based On Chaotic Theory

As the core of nonlinear scientific research, chaotic theory has important theoretical and practical meanings. The measurement by applying chaotic theory is a newer way of signal measuring. People have made great progresses in the discussion of chaotic theory and application of chaotic project in recent 20 years. Some profound understanding and research results of chaotic theory in other fields are absorbed in this thesis and the characteristic of the chaotic theory is analyzed based on domestic and foreign research. It also gives brief introduction of the chaotic theory in the fields of measurement, communication and philosophy, which also reveals importance in practical use and its prospective future.In this thesis, through analyzing the model of Duffing circuit based on chaotic theory and model of coupling Duffing circuit in detail, and adopting the description of signal dynamics, so the complexity of chaotic measured system is decreased. At the same time, two basic chaotic measuring ways of constant voltage and constant current circuit are designed, the operating principle of two measured circuit and the effect of parameters and temperature sensibility on chaotic measured circuit are analyzed, and the chaotic measured circuit of constant current is simulated as well.Two important characteristics of constant current circuit, that is, the parameter sensibility and the initial value sensibility can be obtained by simulating. The output state of system changes with the change of structure parameter; meanwhile, when structure parameter of system is steady, the little change of initial value is generated by the sensitive element of chaotic system changing with parameter change, and the measured quantity can be reflected indirectly by the drastic difference between traces. The measured circuit has a lot of merits, such as , less errors, high linearity, simpleness and flexibility, less equipment, and so on.