一、长度测量用激光测量机械长度和距离的技术,自发明激光以来,实际应用最多。实用的方法有如下三种:第一是干涉测长。利用激光优越的相干性,以激光波长为基准,测量干涉条纹的变化变成 First, the length measurement Laser measurement of mechanical length and distance technology, since the invention of the laser, the practical application of up. The practical method has the following three kinds: The first is the interference length measurement. Using the superior coherence of the laser, taking the laser wavelength as a reference, measuring the change of the interference fringe becomes