High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
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High Precision Grating ruler reading head achieve effective resolution of 20 nmProduct Description RU2 Series Grating ruler reading head● RU2 grating ruler reading head is designed to provide feedback for high precision linear measurement. It adopts UNIMETRO' s most advanced single field scanning technology, advanced automatic gain and automatic deviation correction technology. It can read 20 MHI grating ruler with high precision and anti-pollution performance. It is suitable for high performance and high reliability applications requiring closed-loop and speed control, such as high precision machine tools and automatic deviation correction technology, High-speed automation equipment, etc.
Reference Data High Precision Single Field Scanning Series Reader● RU2 reading head adopts UNIMETRO 's most advanced large area single field scanning technology, automatic gain control technology and automatic deviation correction technology, which can effectively reduce the impact of pollution. The built-in real-speed ADC subdivision of reading head can provide greater bandwidth, and more effectively reduce subdivision noise and subdivision error.It can achieve an effective resolution of 20 nm under the condition of low position noise and smooth speed control, with built-in REF reference origin and limit output, and provides a standard differential TTL digital incremental interface. The multi-color LED is integrated on the reading head, which can indicate signal strength and facilitate installation.
Main Features
◆ Maximum resolution 50 nm. ◆ SinCos 1Vpp, Differential TTL Signal Interface. ◆ Built-in REF origin and limit signal.
Scanning Technology
RU2 reading head adopts LAMOTION advanced large area single field scanning technology. The scattered light emitted by the light source passes through the lens and adjusts to parallel beam. After filtering the surplus beam through the window on the grating, it illuminates on the grating ruler and reflects by the grating ruler to form bright and dark fringes. The grating on the window illuminates on the single field scanning sensor.
High Pollution Resistance of Single Field Scanning
Through LAIVIOTION Dalian Banyan optical test, when using RUS stainless steel grid ruler, the RU2 reading head is polluted by dust, ink and scratches similar to the figure above, the measurement accuracy is only affected by tens of nanometers, and the Lissajou figure of the signal is only affected by a little, there will be no DC deviation and unequal distortion of the amplitude. It will not cause the reading head to be unable to work. The single-field scanning of RU2 reading head only outputs Sin+, Sin-, Cos+, Cos-signals on one sensor. Unlike four-field scanning, it requires four sensors to output signals. When the grid ruler is contaminated, the amplitude of the signal changes at the same time, which will not cause Lissajou pattern distortion.
Automatic Gain Control TechnologyThe RU2 reading head uses the most advanced automatic gain control technology of LAMOTION Dalian Banyan Optics. When the distance between the reading head and the grating ruler changes (mostly when the reading head is adjusted and installed), or when the speed of the reading head changes, the amplitude of the signal will change. The automatic gain control technology of the RU2 reading head can keep the amplitude of these signals stable all the time and ensure the output accuracy.
Detailed Images.
PS:In order to ensure the phase of the origin signal, it may be necessary to adjust the origin magnet.
The Relation between Speed and Resolution and Frequency
Signal Connection
Signal Meaning The meaning of reader ready and limit signal can be judged concretely by referring to the system indicator.
System Indicator The RU2 reading head has built-in multi-color indicator light, which can indicate the current signal, origin and limit status, and can assist the installation and adjustment of the reading head.
Company Information Our Client&Agent
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