White-light fringe detection based on a novel light source and colour CCD camera

0366037 - ÚPT 2012 RIV GB eng J - Journal Article
Buchta, Zdeněk - Mikel, Břetislav - Lazar, Josef - Číp, Ondřej
White-light fringe detection based on a novel light source and colour CCD camera.
Measurement Science and Technology. Roč. 22, č. 9 (2011), 094031:1-6. ISSN 0957-0233. E-ISSN 1361-6501
R&D Projects: GA ČR GP102/09/P293; GA ČR GP102/09/P630; GA MPO 2A-1TP1/127; GA MŠMT(CZ) LC06007; GA MŠMT ED0017/01/01
Institutional research plan: CEZ:AV0Z20650511
Keywords : low-coherence interferometry * phase-crossing algorithm * CCD camera * gauge block
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 1.494, year: 2011

We describe in this paper a pilot experiment of optimization of a white-light source for a low-coherence interferometry. The white-light source combines the light beams generated with colour LEDs. By modelling the white-light spectra, the contrast of a white-light interference fringe could be changed and set to the maximal value. The second part of this paper is a description of a white-light fringe analysis ensured with a low-cost colour CCD camera. The used detection technique employs a phase-crossing algorithm which identifies a zero optical path difference as the point where the phase difference between the red, green and blue parts of the white-light interference fringe becomes equal to zero. The optimized white-light source is designed to be a crucial part of an experimental setup for the surface diagnostics and automatic calibration of gauge blocks.
Permanent Link: http://hdl.handle.net/11104/0201137