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Three-dimensional shape optical measurement using constant gap control and error compensation.

Kyihwan Park1, Kyosoon Choi, Sangyoo Kim

  • 1Department of Mechatronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea. khpark@gist.ac.kr

The Review of Scientific Instruments
|April 2, 2008
PubMed
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This study introduces a constant gap control method to improve optical laser displacement sensor accuracy for 3D shape measurement. This method enhances performance by maintaining a consistent sensor-to-object distance, overcoming surface slope variations.

Area of Science:

  • Metrology
  • Optical Sensing
  • Surface Metrology

Background:

  • Optical laser displacement sensors are crucial for noncontact 3D surface profiling.
  • Surface slope variations cause sensor gain fluctuations, impacting measurement accuracy.
  • Existing methods like constant sensor height struggle with varying object topography.

Purpose of the Study:

  • To develop and evaluate a novel constant gap control method for optical laser displacement sensors.
  • To address and compensate for sensor gain variations caused by object surface slopes.
  • To improve the precision and reliability of 3D shape profile measurements.

Main Methods:

  • Implementation of a constant gap control system to maintain a nominal sensor-to-object distance.
  • Integration of an additional sensor for actuator feedback and control error compensation.

Related Experiment Videos

  • Comparative analysis of the proposed method against the conventional constant sensor height technique.

    • Main Results:

    • The constant gap control method effectively compensates for sensor gain variations due to surface slopes.
    • Control error compensation further refines accuracy when perfect gap control is challenging.
    • 3D shape measurements using the proposed method demonstrated superior performance compared to the constant sensor height method.

    Conclusions:

    • The proposed constant gap control method significantly enhances the performance of optical laser displacement sensors for 3D shape measurement.
    • This approach provides a robust solution for accurate surface profiling of objects with varying slopes.
    • The findings suggest a more reliable method for industrial and scientific surface metrology applications.