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Proceedings Paper

Effects of light wavelength and coherence in structured light sensors
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Paper Abstract

Structured light methods are used by many commercial products on the market today. Many such systems using white light projectors while many line gages use standard red laser diodes. However, in recent years there has been much claimed about using blue light, polarized light and partially coherent systems to obtain better performance. Unlike interferometers, moving from red to blue light for a system using only geometric shape information does not gain an automatic advantage from the shorter wavelength. The sensitivity metric does not have a wavelength component to it. But there are other factors that can improve gage performance. The ability to measure some feature is also a function of other parameters such as signal to noise ratio, reflectivity variations, and depth-of-field over which a clear pattern can be seen. This paper will explore the theoretical and experimental data relating to what works and what can be expected from variations on the old methods.

Paper Details

Date Published: 19 May 2016
PDF: 10 pages
Proc. SPIE 9868, Dimensional Optical Metrology and Inspection for Practical Applications V, 986806 (19 May 2016); doi: 10.1117/12.2224588
Show Author Affiliations
Kevin Harding, GE Global Research (United States)
Rajesh Ramamurthy, GE Global Research (United States)
Zirong Zhai, GE Global Research (China)
Jie Han, GE Global Research (China)
Dongmin Yang, GE Global Research (China)

Published in SPIE Proceedings Vol. 9868:
Dimensional Optical Metrology and Inspection for Practical Applications V
Kevin G. Harding; Song Zhang, Editor(s)

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