Research of digital level gauge based on differential motion capacity sensor and 89C51 single chip computer

The functional insufficiency of a bubble level gauge is put forward,and an digital level gauge is produced.The improved gauge adopts a variable dielectric differential motion capacitive sensor,uses a digital circuit to transfer capacity change into frequency change,uses 89C51 single chip computer to process signal.The testing result is satisfying and the precision reaches 0.01 mm/m.