What is linear encoder？！

linear encoder, also referred to as grating displacement sensor (encoder sensor), is the use of an optical grating feedback device measuring principle. Scale often used in CNC machine tools, closed-loop servo system, it can be used as the linear displacement or angular displacement detection. The measurement output signal into a digital pulse detecting range, high precision, fast response characteristics. For example, in CNC machine tools often used to coordinate the tool and the workpiece is detected, and to observe the effect of motion tracking error error passes to play a compensation tool.
Grating according to the manufacturing method and optical principles, divided into transmission grating and reflection grating.

Chinese name
    Grating linear scale

Other name
    Grating displacement sensor

Using the principle of
    Grating optical principle
Composition
    Scale raster and raster scanning head

structure
Grating scale grating and the grating by reading the first two parts. Scale grating generally fixed to the fixed machine parts, raster scanning head mounted on the machine moving parts index grating mounted raster reading head. Grating structure is shown on the right. [1]
The key portion of the raster detection means readhead grating, which consists of light
Grating appearance
Grating appearance
Source, converging lens index grating, optical components and adjustment mechanism and other components. Many forms of reading head grating structure, according to the reading head into the structural characteristics and use the occasion to directly receive formula Readhead (or silicon photocell reading head, mirrored reading head, type spectroscope reading head, metal grating reflective reading head).

Previous：working principle of linear scale
Next：Absolute encoder & incremental encoder