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Interferometry

Almost-common path interferometer using the separation of polarization states for digital phase-shifting shearography

[+] Author Affiliations
Vanessa Rosso

Université de Liège,Department of Physics HOLOLAB, Bat. B5a, B-4000 Liège, Belgium

Fabrice Michel

DEIOS s.a.,Liège Science Park-Spatiopole, rue des Chasseurs Ardennais (WSL), B-4031 Angleur, Belgium

Vincent Moreau

DEIOS s.a.,Liège Science Park-Spatiopole, rue des Chasseurs Ardennais (WSL), B-4031 Angleur, Belgium

Yvon Renotte

Université de Liège,Department of Physics HOLOLAB, Bat. B5a, B-4000 Liège, Belgium

Serge Habraken

Université de Liège,Department of Physics HOLOLAB, Bat. B5a, B-4000 Liège, Belgium

Bernard Tilkens

DEIOS s.a.,Liège Science Park-Spatiopole, rue des Chasseurs Ardennais (WSL), B-4031 Angleur, Belgium

Yves Lion

Université de Liège,Department of Physics HOLOLAB, Bat. B5a, B-4000 Liège, Belgium

Opt. Eng. 46(10), 105601 (February 06, 2007April 19, 2007April 20, 2007October 19, 2007). doi:10.1117/1.2795632
History: Received February 06, 2007; Revised April 19, 2007; Accepted April 20, 2007; Published October 19, 2007
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An original experimental setup for shearography with metrological applications is presented. The simplicity and the efficiency of the setup are provided by a shearing device, a prism that separates the TE and TM polarization modes with a coating and a thin glass plate placed on its face. The use of this shearing device enables an in-line and almost-common path configuration for the shearing interferometer, a path that leads to high stability and a low sensitivity to external disturbances. Moreover, the sensitivity of the interferometer can be easily adjusted for different applications by varying the shearing amount with glass plates of different thicknesses or by moving the shearing device between two lenses along the optical axis. The temporal phase-shifting method is applied through the use of a liquid crystal variable retarder.

Figures in this Article
© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Vanessa Rosso ; Fabrice Michel ; Vincent Moreau ; Yvon Renotte ; Serge Habraken, et al.
"Almost-common path interferometer using the separation of polarization states for digital phase-shifting shearography", Opt. Eng. 46(10), 105601 (February 06, 2007April 19, 2007April 20, 2007October 19, 2007). ; http://dx.doi.org/10.1117/1.2795632


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