Software developing for phase analysis of the fiber-optic ESPI set-up
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ANDRIESH, Andrei, ABASHKIN, Vladimir, AKIMOVA, Elena, COLESNICOV, Alexandru. Software developing for phase analysis of the fiber-optic ESPI set-up. In: Materials Science and Condensed Matter Physics, Ed. 6, 11-14 septembrie 2012, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2012, Editia 6, p. 131. ISBN 978-9975-66-290-1.
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Materials Science and Condensed Matter Physics
Editia 6, 2012
Conferința "Materials Science and Condensed Matter Physics"
6, Chișinău, Moldova, 11-14 septembrie 2012

Software developing for phase analysis of the fiber-optic ESPI set-up


Pag. 131-131

Andriesh Andrei1, Abashkin Vladimir1, Akimova Elena2, Colesnicov Alexandru3
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 Institute of Applied Physics,
3 Institute of Mathematics and Computer Science ASM
 
 
Disponibil în IBN: 19 martie 2020


Rezumat

When an optically rough surface is illuminated by a beam of coherent laser light and the light scattered from the surface is observed on a plane some distance away, then at any point on this plane, the electric field is the vector sum of all the elementary fields which reach each point after being scattered by different portions of the entire rough surface. Since the surface is optically rough, the total electric field and intensity around any point change randomly with position on the observation plane. These random fluctuations in intensity are known as laser speckles. Laser speckles carry information about the rough surface which produces them and have found many applications, which are known generally as speckle methods. One of these methods is electronic speckle pattern interferometry (ESPI) and it is the most practical and powerful one among the existing optical techniques for deformation and vibration analysis [1]. Reliable information on object properties by applying method strongly depends on quality of speckle images. Information on the surface of a static object can be obtained from interference fringes, whose contour lines characterize the surface on which they are formed. Obtaining information on object properties is resulted as optical set-up performance as digital processing. Digital phase extraction is the sequent step in image processing after optical acquisition. For digital processing of speckle images obtained we made use of a spatial phase shifting method digital implemented by application of developed soft based on LabVIEW environment. Information about the surface of a static object can be obtained from interference fringes, whose contour lines characterize the surface on which they are formed. LabVIEW is a graphical programming language elaborated by National Instruments (NI) [2]. It contains a comprehensive set of tools for acquiring, processing, analyzing, displaying, and storing data. This communication is a sequel of works, e.g. [3], devoted to ESPI industrial application. ESPI combines optical and digital processor in one interferometric method. In the report presented the CCD Smart Camera with a powerful processor on the board is all-in-one solution for machine vision applications. For software implementation based on LabVIEW for the phase calculation, the main algorithm has been elaborated with following considerations: be flexible and fast, easy control, have the possibility to be implemented in other language due to simple the code conversation. NI Vision Builder programming configures Smart Camera and optical set-up and facilitates interferograms processing by PC. [1] Rastogi P.K. (ed), Digital Speckle-Pattern Interferometry and Related Techniques, Willey, New York, 2001. [2] http://www.ni.com/ [3] P. Castellini, V. Abaskin, E. Achimova, Portable electronic speckle interferometry device for the defect measurements in wood artworks, J. Cultural Heritage, V. IX, N3, pp.225-233, 2008.