0.2" angle precision and ±0.2um length precision grating coder modulators reticle

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Incremental circular grating, absolute coder and modulator have been widely used in the field of photoelectric translating systems, including angle displacement sensors and line displacement sensors. They can reach 0.2" angle precision and ±0.2um length precision. Changhui-EO has overcome the unstable error caused by laser length measuring and reached a precision accuracy of 0.1 um during processing high precision gratings, such as the variable-transmission
MTF sinusoidal grating, the variable-frequency OTF optical transfer function grating, and the novel wavelength gratings which use the wavelengths of Helium and Neon as their raster unit,

Many kinds of single loop absolute coders that Changhui-EO produced have been widely used in total station and electronic theodolite systems, which not only replace the old existing products but also upgrade the technology to a new height.

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