Optical axis calibration method using a 4-DOFM system for linear guide detection.

Area of Science:

• Metrology and Measurement Science
• Optical Engineering
• Mechanical Engineering

Background:

• Geometric error detection in long-travel linear guides is critical for precision engineering.
• Air disturbances pose a significant challenge to traditional laser measurement techniques.
• Existing methods often require complex setups or lack accuracy for extended travel distances.

Purpose of the Study:

• To propose a novel optical axis calibration approach for accurate geometric error detection of long-travel linear guides.
• To address the limitations imposed by environmental factors like air disturbances.
• To develop a system capable of measuring multiple error components simultaneously.

Main Methods:

• Utilizing a four-degree-of-freedom measurement (4-DOFM) system for comprehensive error detection.
• Segmenting the long-travel guide rail into multiple sections for localized measurement.
• Developing an optical axis calibration algorithm for synthesizing sectional measurements.
• Employing the 4-DOFM system without the need for additional specialized equipment.

Main Results:

• The 4-DOFM system successfully measured two straightness errors and two angular errors (pitch and yaw).
• The proposed optical axis calibration algorithm enabled the synthesis of sectional measurement data.
• Experimental verification on a 2-meter linear guide confirmed the method's effectiveness and accuracy.
• The system demonstrated the ability to measure optical axis differences between sections.

Conclusions:

• The developed optical axis calibration approach provides a practical and effective solution for geometric error detection in long-travel linear guides.
• The 4-DOFM system offers a robust method for overcoming air disturbance issues in laser metrology.
• This technique enhances the precision and reliability of measurements for long linear motion systems.