Reference : Carrier and aberrations removal in interferometric fringe projection profilometry
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/126786
Carrier and aberrations removal in interferometric fringe projection profilometry
English
Blain, Pascal mailto [Université de Liège - ULg > Département de physique > Optique - Hololab >]
Michel, Fabrice mailto []
Renotte, Yvon mailto [Université de Liège - ULg > Département de physique > Optique - Hololab >]
Habraken, Serge mailto [Université de Liège - ULg > Département de physique > Optique - Hololab >]
17-Apr-2012
Optical Micro- and Nanometrology IV (SPIE proceedings vol.8430)
Gorecki, Christophe
Asundi, Anand K.
Osten, Wolfgang
SPIE
84300O-84300O-10
No
International
9780819491220
SPIE Photonics Europe
du 16 avril 2012 au 20 avril 2012
SPIE
Bruxelles
Belgium
[en] Fringe projection profilometry ; Interferometry ; Aberrations
[en] A profilometer which takes advantage of polarization states splitting technique and monochromatic light projection method as a way to overcome ambient lighting for in-situ measurement is under development [1, 2]. Because of the Savart plate which refracts two out of axis beams, the device suffers from aberrations (mostly coma and astigmatism). These aberrations affect the quality of the sinusoidal fringe pattern. In fringe projection profilometry, the unwrapped phase distribution map contains the sum of the object’s shape-related phase and carrier-fringe-related phase. In order to extract the 3D shape of the object, the carrier phase has to be removed [3, 4]. An easy way to remove both the fringe carrier and the aberrations of the optical system is to measure the phases of the test object and to measure the phase of a reference plane with the same set up and to subtract both phase maps. This time consuming technique is suitable for laboratory but not for industry. We propose a method to numerically remove both the fringe carrier and the aberrations. A first reference phase of a calibration plane is evaluated knowing the position of the different elements in the set up and the orientation of the fringes. Then a fitting of the phase map by Zernike polynomials is computed [5]. As the triangulation parameters are known during the calibration, the computation of Zernike coefficients has only to be made once. The wavefront error can be adjusted by a scale factor which depends on the position of the test object.
Région wallonne : Direction générale des Technologies, de la Recherche et de l'Energie - DGTRE
Porjet Mint
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/126786
10.1117/12.922533

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