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Optical Inspection System for Gear Tooth Surfaces Using a Projection Moiré Method.
1Department of Mechanical Engineering, National Central University; Taoyuan 32001, Taiwan. ethan@ncu.edu.tw.
Sensors (Basel, Switzerland)
|April 3, 2019
Summary
This study introduces a non-contact optical inspection method for gear teeth using moiré fringes. The system accurately measures gear tooth topography and deviations, meeting precision engineering demands.
Area of Science:
- Optical Engineering
- Metrology
- Mechanical Engineering
Background:
- Increasing demand for rapid online inspection of precision gear tooth surfaces.
- Limitations of traditional contact-based measurement methods for complex geometries.
Purpose of the Study:
- To develop and validate a non-contact optical measurement method for gear tooth surface inspection.
- To assess the accuracy of the developed system against a commercial Coordinate Measuring Machine (CMM).
Main Methods:
- Utilized a halogen lamp and autocollimator to generate a collimated beam.
- Employed moiré fringe projection through two linear gratings onto the gear tooth surface.
- Recorded fringes with a charge-coupled device (CCD) camera and reconstructed surface contours using developed computer codes.
Main Results:
- Successfully estimated and reconstructed gear tooth surface contours from fringe phase information.
- Calculated tooth topography, involute profile deviation, and axial-direction deviation.
- Demonstrated accuracy by comparing optical measurements with CMM-measured reference profiles.
Conclusions:
- The developed non-contact optical method provides accurate inspection of gear tooth surfaces.
- The system is suitable for online quality control in precision gear manufacturing.
- Optical metrology offers a viable alternative to traditional CMM for certain gear inspection tasks.
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