The working principle of linear scale

The linear scale is composed of reading head, main ruler, and interfaces. Evenly stamped with pervious to light and small pervious to light glass grating lines and grid line of 50 lines/mm, its grating lattice spacing is 0.02 mm, the resolution can be got after four subdivision is 5 microns of count pulse. Generally, line number according to the measured accuracy of print, in order to distinguish the direction, lines were carved into the phase difference between 9 0 ° two way. When reading head movement, the interface circuit of photoelectric receiver respectively a and b are two road phase difference of 90 ° pulse. The output signal by digital display system breakdown processing, resolution is fine fraction, grating period divided by the number of signals through electrical signal subdivision processing resolution for 5 um or 1 um.

The purpose of the linear scale 

Has been widely used in modern automatic control system of photoelectric sensor, such as grating ruler) to solve the axis line of displacement, speed, or corner of the monitoring and control problems.

Apply the following areas:

Processing equipment: lathe, milling machine, boring machine, grinding machine, edm machine, thread cutting, etc

Measuring instruments: projectors, video measuring instrument, tool microscope, etc

Can also be used for numerical control machine tool motion error compensation effect