Digital Phase Stepping Speckle Interferometry

1988 ◽  
Author(s):  
A. A. M. Maas ◽  
H. A. Vrooman
Keyword(s):  
Speckle Interferometry ◽  
Digital Phase ◽  
Phase Stepping

Digital phase stepping speckle interferometry

1986 ◽  
Vol 57 (1) ◽  
pp. 26-30 ◽  
Author(s):  
D.W. Robinson ◽  
D.C. Williams
Keyword(s):  
Speckle Interferometry ◽  
Digital Phase ◽  
Phase Stepping

Determination of Elastic Constants of Anisotropic Plates by Phase Stepping Speckle Interferometry

2001 ◽  
Vol 221-222 ◽  
pp. 363-374 ◽  
Author(s):  
L. Bruno ◽  
Franco Furgiuele ◽  
Leonardo Pagnotta ◽  
A. Poggialini
Keyword(s):  
Elastic Constants ◽  
Speckle Interferometry ◽  
Anisotropic Plates ◽  
Phase Stepping

scholarly journals One–shot phase stepping with a pulsed laser and modulation of polarization: application to speckle interferometry

2015 ◽  
Vol 23 (18) ◽  
pp. 23414 ◽  
Author(s):  
G. Rodríguez-Zurita ◽  
A. García-Arellano ◽  
N. I. Toto-Arellano ◽  
V. H. Flores-Muñoz ◽  
R. Pastrana-Sánchez ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Speckle Interferometry ◽  
Phase Stepping

scholarly journals High Spatial-Resolution Digital Phase-Stepping Shearography

2021 ◽  
Vol 7 (10) ◽  
pp. 192
Author(s):  
Awatef Rashid Al Jabri ◽  
Kazi Monowar Abedin ◽  
Sheikh Mohammed Mujibur Rahman
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Destructive Testing ◽  
Test Plate ◽  
Imaging Device ◽  
Imaging Methods ◽  
Interferometric Technique ◽  
Digital Phase ◽  
Phase Stepping ◽  
Phase Map

Digital phase-stepping shearography is a speckle interferometric technique that uses laser speckles to generate the phase map of the displacement derivatives of a stressed object, and hence can map the stresses of a deformed object directly. Conventional digital phase-stepping shearography relies on the use of video cameras of relatively lower resolution, in the order of 5 megapixels or lower, operating at a video rate. In the present work, we propose a novel method of performing high spatial resolution phase stepping shearography. This method uses a 24 megapixel still digital imaging device (DSLR camera) and a Michelson-type shearing arrangement with an edge-clamped, center-loaded plate. Different phase-stepping algorithms were used, and all successfully generated shearograms. The system enabled extremely high-resolution phase maps to be generated from relatively large deformations applied to the test plate. Quantitative comparison of the maximum achieved spatial resolution is made with the video-rate cameras used in conventional shearography. By switching from conventional (video) imaging methods to still imaging methods, significantly higher spatial resolution (by about 5 times) can be achieved in actual phase-stepping shearography, which is of great usefulness in industrial non-destructive testing (NDT).

Digital phase-stepping holographic interferometry in measuring 2-D density fields

1990 ◽  
Vol 9 (4) ◽  
pp. 231-235 ◽  
Author(s):  
T. A. W. M. Lanen ◽  
C. Nebbeling ◽  
J. L. van Ingen
Keyword(s):  
Holographic Interferometry ◽  
Digital Phase ◽  
Phase Stepping
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