Design of Absolute Magnetic Grid Displacement Sensor Based on Encoding Principle
A new kind of magnetic grid absolute linear displacement sensor is introduced. The displacement measuring method of two new kinds of magnetic grid sensors for single-row and double-row magnet are also proposed in this paper. The double-row magnet sensor is composed of the look-up table column and encoding column, the look-up table column achieves the calculation of relative displacement within a cycle. Precision of the double-row magnet sensor is analyzed and the resolution can reach 0.75µm. The displacement measurement of single-row magnet is realized by adding Hall group based on the encoding column. The signal is processed according to the voltage curves induced by multi-group of Halls.
Xingui He, Ertian Hua, Yun Lin and Xiaozhu Liu
J. Z. Liu et al., "Design of Absolute Magnetic Grid Displacement Sensor Based on Encoding Principle", Applied Mechanics and Materials, Vols. 88-89, pp. 336-340, 2011