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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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Flying spot laser triangulation scanner using lateral synchronization for surface profile precision measurement.

Hanlin Zhang, Yongjie Ren, Changjie Liu

    Applied Optics
    |August 5, 2014
    PubMed
    Summary

    A novel laser triangulation scanner with an autosynchronized scanning scheme achieves high-speed, high-precision surface profile measurement. This system offers a larger field of view and enhanced accuracy for quality control applications.

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    Area of Science:

    • Metrology
    • Optical Engineering
    • Instrumentation

    Background:

    • High-speed, high-precision surface profile measurement is essential for industrial quality control and target inspection.
    • Conventional triangulation methods face limitations in balancing field of view and range precision.

    Purpose of the Study:

    • To propose and validate a novel laser scanner system for high-speed, high-precision surface profile measurement.
    • To introduce an autosynchronized scanning scheme to overcome limitations of traditional triangulation.

    Main Methods:

    • Development of a laser scanner using a single-point laser triangulation displacement sensor and a high-speed rotating polygon mirror.
    • Implementation of an autosynchronized scanning scheme and lateral synchronized flying spot technology.
    • Incorporation of automatic point-to-point laser power control and speckle noise reduction techniques.

    Main Results:

    • The proposed system demonstrates a programmable, larger field of view with high immunity to ambient light and reflections.
    • High optical signal-to-noise ratio and minimal shadow effect were achieved.
    • System calibration accuracy was found to be generally smaller than ±0.025 mm.
    • Experimental validation using a laboratory prototype confirmed the system's capabilities.

    Conclusions:

    • The developed laser triangulation scanner offers a promising solution for fast and precise surface profile measurement.
    • The autosynchronized scanning scheme effectively addresses the trade-off between field of view and range precision.
    • The system exhibits broad application prospects in demanding industrial inspection scenarios.