November 2008
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12 Reads
Proceedings of SPIE - The International Society for Optical Engineering
As a kind of radioactive gas, radon has the characteristics of radioactive decay and statistical fluctuation. The radon concentration is always in a dynamic changing process, it is difficult to implement the accurate control. In order to make the radon chamber keep a stability radon concentration, a fuzzy radon replenishment control model based on Takagi-Sugeno model is proposed. According to the idea of Takagi-Sugeno model, a two-dimensional fuzzy controller include two inputs and single output is designed. The input variables of this fuzzy controller is E and EC, E is the deviation between the actual concentration and expected radon concentration, EC is the change rate of radon concentration. the output variable of controller is U that used to control the valve of radon source. The fuzzy control rule of radon concentration is build by reasoning machine. The accurate control output variable is obtained by anti-fuzzy method and be used to control the valve state radon source. A radon chamber control system is developed by Labview based on the fuzzy control model. The experimental results show that the fuzzy control method improve the robustness of dynamic radon replenishment.