Document Type
Conference Proceeding
Publication Title
Proceedings Of SPIE - The International Society For Optical Engineering
Abstract
Most optical topology systems use a single wavelength laser for projection, using a swept spot, a moving line, or a projected grating. In a typical projected grating system, the gratings are shifted and a series of images are used to recover the 3-D shape of the target. When the series of images is analyzed in the normal phase shift manner, the resulting 2-D phase map typically has phase unwrapping problems due to noise and Nyquist limits. Surfaces with large vertical discontinuities present the biggest problem in 3-D shape recovery. This paper looks at simultaneously projecting multiple wavelengths onto a surface to help avoid problems in unwrapping the 2-D phase map. Using multiple wavelengths, the interferometer mirror does not have to be rotated to change the grating pitch and some operations can be done in parallel which reduces scanning time. Limitations and improvements in the current system will be discussed.
DOI
10.1117/12.334331
Publication Date
1998
Recommended Citation
Gilbert, Bernard S. and Blatt, Joel H., "Multicolor Fringe Projection System With Enhanced 3-D Reconstruction Of Surfaces" (1998). Aerospace, Physics, and Space Science Faculty Publications. 150.
https://repository.fit.edu/apss_faculty/150