Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

RGB Interferometer Measures Diffractive Optical Elements

Photonics Spectra
Apr 2003
While white-light interferometry may be a standard tool for measurement of discontinuous profiles, it requires significant data collection and evaluation. Researchers at the University of Erlangen-Nuremberg in Germany offer a solution involving phase-shifting interferometry. The technique simultaneously records three interference patterns from a three-chip color CCD camera at red, green and blue wavelengths. Because it is possible to calculate the absolute profile height for each pixel or location in the exit pupil of the interferometer, the technique effectively resolves common problems of other phase-shifting devices; namely, limitations related to the requirement that the height difference between two neighboring pixels be smaller than one-quarter of the wavelength.


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!