Since the 1970s.rapid developing of microelectronics and computer technologies has made the sensor industry accelerated at a growing rate.The yield of sensors has been increasing and the applications extending.The market of sensors and transducers in the world is expanding.According to the survey given by Amcrican Since the 1970s.rapid developing of microelectronics and computer technologies has made the sensor industry accelerated at a growing rate. The yield of sensors has been increasing and the applications extending. Market of sensors and transducers in the world is expanding. According to the survey given by Amcrican