Abstract
Light stripe triangulation configuration based on a color-coded arrangement allows parallel, fast, real-time 3-D surface profilometry with an extended depth-measuring range and high axial and lateral resolution[1]. The method exploits polychromatic illumination and a cylindrical element that disperses the incident light along the axis, leading to an increased depth-measuring range without any decrease in the axial or the lateral resolution. In our recent experiments[2] the cylindrical element was a combined diffractive-refractive optical element in which many light stripes, each of a different wavelength, are simultaneously focused at different focal lengths, forming a rainbow light sheet. The discrimination of each color stripe was further improved by a color decoding technique, in which a spectral filter simultaneously matched the entire wavelength distribution of the light sheet during detection. A 20-fold increase in the depth of focus was experimentally obtained, while diffraction-limited light stripes with extremely small sidelobes were completely maintained.
© 2000 IEEE
PDF ArticleMore Like This
Gang Yao and Lihong V. Wang
MB3 Biomedical Optical Spectroscopy and Diagnostics (BIOMED) 2000
Stephan R. Clark, John E. Greivenkamp, Ralph M. Richard, and José M. Sasian
OTuB2 Optical Fabrication and Testing (OF&T) 2000
M.L. Arroyo Carrasco, P. Rodríguez Montero, and S. Stepanov
CTuN8 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2000