Analyzing three practical measuring situations,this article describes what the real time correcting technology of refractive index of air would have influence on the result of the measurement,and the relationship between the equipment arrangement and the way of line scale installation in the process of line scale measurement in the method of laser interference,and gives the respective conclusions.

A new aiming method in laser interferometer-single slit multisampling system for improving the accuracy of line scale is introduced.

A Method of Measuring Wave Length of Light Wave Using Metre;

To solve the question that measuring nano-scale linewidth by atomic force microscope with nanotube tip at tapping mode,the vibration model of micro-cantilever is proposed,the vibration tip top's track is described and the images by measuring standard sample under different conditions are simulated according as mechanical vibration and mathematical morphology.