关键词: 位移测量, 坐标转换

Abstract: The work principle and mathematical model of various modulation displacement sensor are analyzed. Based on the idea of “measuring space by time” and the Galilean Transformation, it proposes for the first time the idea of relative motion dual coordinate with points for time check, and transforms the difference of space into the difference of time to measure. And then, a theory of time----space coordinate transformation are developed.

Key words: Coordinate transformation, Displacement measurement