To improve the measurement precision of the displacement sensor

increase the pole-pair number under the same max tooth number.On the basis of analyzing time grating displacement sensors

a new design of the displacement sensor is proposed.The working theory and the structure of the new displacement sensor are introduced.To get some number of notches

this sensor can get more pole-pair number than other sensors

so it’s good for improving the measurement precision.The experiment based on grating with high precision is carried out

the measurement error of the sensor is ±6.5″.