Abstract: This paper introduces an adaptive high-speed pulse electromagnetic light valve.Because of some uncertainty of electromagnetic light valves,in order to raise the frequency of the valve in certain basic structure by adjusting the parameters of drive current,we observed the status of the valve in various controllable parameters through experiments.Then,these data are used to design adaptive fuzzy control system by means of genetic algorithms.The advantages of the valve are no influence on the character of the light path,simple structure,long life,high frequency and relatively large switch calibre,etc.The valve is applied successfully in 3D laser scanning equipment.

Key words: genetic algorithms, fuzzy control, adaptiveness, electromagnetic light valve