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Dynamic measurement of first-order spatial derivatives of deformations by digital shearography.
- Source :
- Instruments & Experimental Techniques; Jul2017, Vol. 60 Issue 4, p575-583, 9p
- Publication Year :
- 2017
-
Abstract
- This paper presents a simple spatial phase shift shearography based on the Michelson interferometer. A novel digital shearography set-up with a large angle of view, which is based on a 4 f system is demonstrated. In the system, the Michelson interferometer is used as a shearing device to generate a shearing distance by tilting a small angle in one of the two mirrors. In fact spherical wave fronts become plane after going through the first lens in 4 f system. Tilting the mirror in the Michelson interferometer also generates spatial carrier frequency. Sinusoid fitting method is applied to evaluate the phase. This system can generate a phase map of shearography by using only a single image. The effects of shearing angle, the choice of algorithm and comparison result are discussed in detail. The theory and the application are presented. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00204412
- Volume :
- 60
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Instruments & Experimental Techniques
- Publication Type :
- Academic Journal
- Accession number :
- 124377206
- Full Text :
- https://doi.org/10.1134/S0020441217040145