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High-precision practical calibration method with virtual point constraint for line-structured light sensor.

Yuanbo Mu, Qingzhou Mao, Haoxuan Xu

|June 14, 2025

Summary

This summary is machine-generated.

This study introduces a novel calibration method for line-structured light sensors, significantly improving measurement accuracy in engineering. The new approach enhances precision for applications like gauge block and rail profile measurements.

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Area of Science:

Engineering
Metrology
Optical Measurement Systems

Background:

Wide fields of view and large depth of field in engineering measurements degrade line-structured light sensor accuracy.
Existing calibration techniques are insufficient to mitigate these adverse effects.

Purpose of the Study:

To develop a high-precision calibration method for line-structured light sensors.
To overcome accuracy limitations caused by wide fields of view and large depth of field.

Main Methods:

Calibration object design and virtual calibration point extraction.
Development of a continuous linear displacement calibration platform.
Detailed laser surface collection and description for enhanced calibration.

Main Results:

Achieved Root Mean Square Error (RMSE) of 0.007 mm for gauge block measurements and 0.032 mm for rail profile measurements within a 260-540 mm range.
Demonstrated significant accuracy improvements of 77.4% and 86.9% compared to the light plane method.
Maintained high accuracy across the entire measurement range.

Conclusions:

The proposed method offers a substantial advancement in high-precision calibration for line-structured light sensors.
The technique maintains accuracy across the measurement range and enables automated calibration.
This method holds significant practical value for diverse engineering applications.