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Optical Inspection System for Gear Tooth Surfaces Using a Projection Moiré Method

Department of Mechanical Engineering, National Central University; Taoyuan 32001, Taiwan
Author to whom correspondence should be addressed.
Sensors 2019, 19(6), 1450;
Received: 31 January 2019 / Revised: 20 March 2019 / Accepted: 21 March 2019 / Published: 25 March 2019
(This article belongs to the Special Issue I3S 2018 Selected Papers)
PDF [6593 KB, uploaded 25 March 2019]


The demand for rapid online optical inspection of gear tooth surfaces is increasing, especially for precision gears. In this study, a non-contact optical measurement method was established for the inspection of gear tooth surfaces. For the system architecture, a halogen lamp was selected as the light source, and a collimated beam was produced by an autocollimator. Subsequently, moiré fringes were formed as the collimated beam went through the two linear gratings. The moiré fringes projected on the gear tooth surface were recorded with a charge-coupled device (CCD) camera, and the contour of the gear tooth surface was estimated and reconstructed from the phase information of the fringes by our developed computer codes. To verify the accuracy of the system, a spur gear tooth surface measured by a commercial coordinate measuring machine (CMM) was defined as the reference tooth profile. The tooth topography, involute profile deviation, and axial-direction deviation were successfully calculated by measuring the deviation of the optically measured surface based on the reference gear tooth profiles measured using the CMM. View Full-Text
Keywords: optical inspection; projection moiré; gear tooth topography optical inspection; projection moiré; gear tooth topography

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Chen, Y.-C.; Chen, J.-Y. Optical Inspection System for Gear Tooth Surfaces Using a Projection Moiré Method. Sensors 2019, 19, 1450.

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