研究目的
To propose an inverse projected-fringe technique for the on-machine inspection of axisymmetric parts with high specular surfaces and sharp slopes, aiming to improve the signal to noise ratio and repeatability compared to the standard fringe projection technique.
研究成果
The IPF technique improves the SNR and repeatability of measurements for axisymmetric parts, especially in regions with steep slopes, achieving an accuracy of better than 10 microns for parts with a radial dimension of about 10 cm.
研究不足
The technique requires the location of any test part to be the same as the location of the master-part used for optimization. Errors in determining transformation matrices can propagate to measurement errors, especially in regions with steep slopes.
1：Experimental Design and Method Selection:
The study uses a computer simulation-based method and the CAD model of the part to produce inverse fringes and find an appropriate trace for measurement.
2：Sample Selection and Data Sources:
The study focuses on axisymmetric parts with high specular surfaces and sharp slopes.
3：List of Experimental Equipment and Materials:
A 1080x1920 DMD projector, a 3288x4608 CMOS camera, 50 mm focal length projector lens, 16 mm focal length camera lens, and an axisymmetric part are used.
4：Experimental Procedures and Operational Workflow:
The process involves producing IPF patterns, calibration, and measurement using both IPF and SFP techniques.
5：Data Analysis Methods:
The study compares the SNR and repeatability of measurements between IPF and SFP techniques.
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