Abstract: The high sensitive displacement censor by connecting varistors to be unbalanced bridge,can convert the micro displacement quantity into electricity quantity.It is collected and screened synchronously on the computer by the STM32 micro controller,and the measurement is made to be real-time monitoring.It has practical and convenient merits of easy sample replacement,fast operation and high accurate results.

Key words: magnetostrictive coefficient, displacement censor, STM32 micro-controller, varistor