High Precision Displacement Measurement Grating Ruler Optical Linear Encoder with Glass Material and Customizable 3500mm Film

A grating ruler, also known as an optical linear encoder, is a sensor that achieves high-precision displacement measurement using optical principles. It is commonly used to measure linear position, displacement, and speed, and is widely applied in the closed-loop servo systems of CNC machine tools. Its measurement output signals are digital pulses, featuring a large detection range, high detection accuracy, and fast response speed. According to different manufacturing methods and optical principles, grating rulers are divided into transmissive gratings and reflective gratings.

Support professional customization to meet specific application requirements.

A grating ruler usually consists of two main parts:

1. Scale Grating (Fixed Part): A glass or metal ruler with uniform engraved lines, where the spacing between engraved lines is extremely small (micron level).
2. Reading Head (Moving Part): Contains a light source (LED), photoelectric sensor, and signal processing circuit inside. It moves along the grating ruler with mechanical motion and reads position information in real time.

In simple terms, the core of the grating ruler is based on an optical principle: when light passes through regular engraved lines, it produces periodic changes (similar to "light and dark fringes"). The process can be understood as follows:

1. The light source irradiates the grating engraved lines.
2. The light is "cut" by the engraved lines into periodic light and dark signals.
3. The photoelectric sensor receives these changes.
4. The system converts them into electrical signals (pulses or digital quantities).
5. Finally, the displacement, position, or speed is calculated.

• Ultra-high Precision: The resolution can reach micron or even nanometer level, making it widely used in high-end CNC equipment.
• Strong Real-time Feedback Capability: Continuously outputs position signals and is suitable for closed-loop control systems.
• Non-contact Measurement: No mechanical wear, long service life, and high stability.
• Good Anti-interference Ability: Optical measurement is not affected by electromagnetic interference, and the signal is stable and reliable.

Grating rulers are used in almost all equipment that requires precise movement, such as:

• CNC Machine Tools: Position closed-loop control
• Automation Equipment: Precision positioning
• Semiconductor Equipment: Nanoscale positioning
• Testing Instruments: High-precision measurement systems
• Robotics: Linear axis position feedback