测距应用广泛，普通标尺测距很难达到精微测距的要求，激光在这方面有着明显的优势，本文更是运用相位来进一步提高检测的精度！-Ranging widely, ranging ordinary scale ranging requirements difficult to achieve subtle, laser has a distinct advantage in this regard, this paper is the use of phase to further improve the detection accuracy!