Calibration of Laser Beam Direction for Inner Diameter Measuring Device

Area of Science:

• Metrology
• Optical Measurement
• Mechanical Engineering

Background:

• Laser triangulation is a key technology for precise large inner diameter measurement.
• Existing devices require calibration due to deviations between laser beams and theoretical models.
• Accurate calibration is crucial for reliable industrial measurements.

Purpose of the Study:

• To propose a novel calibration method and mathematical model for laser displacement sensors.
• To enhance the accuracy of a large inner diameter measuring device.
• To validate the effectiveness of the proposed calibration technique.

Main Methods:

• Developed a calibration method and mathematical model for laser beam direction.
• Integrated three laser displacement sensors with a machine tool spindle for rotary scanning.
• Utilized sensor distance information and data processing for direction calibration.

Main Results:

• Reduced measurement error from ± 25 μm to ± 15 μm.
• Achieved a relative error of no more than 0.011%.
• Verified the validity of the calibration method through error source analysis.

Conclusions:

• The proposed calibration method effectively improves the accuracy of laser triangulation-based inner diameter measurement.
• The developed device and calibration technique are suitable for industrial applications requiring high precision.
• Further analysis confirmed the robustness and validity of the implemented calibration approach.