DSPI system based on spatial carrier phase shifting technique

2013 ◽  
Author(s):  
Yonghong Wang ◽  
Junrui Li ◽  
Jianfei Sun ◽  
Lianxiang Yang
Keyword(s):  
Carrier Phase ◽  
Phase Shifting ◽  
Phase Shifting Technique ◽  
Carrier Phase Shifting

Multi-STFT for adaptive SCPS phase determination

2009 ◽  
Vol 17 (4) ◽  
Author(s):  
R. Sitnik
Keyword(s):  
Fourier Transform ◽  
Carrier Phase ◽  
Fringe Pattern ◽  
Phase Shifting ◽  
Shape Measurement ◽  
Step Method ◽  
Phase Determination ◽  
3D Shape Measurement ◽  
Phase Calculation ◽  
Carrier Phase Shifting

AbstractThis paper presents a fast and reliable approach for phase modulo 2π-calculation from a single fringe pattern. It calculates correct phase values even for very complex and variable shape gradients based on a locally variable fringe period determined for the entire image. In the paper, a new two-step method for wrapped phase calculation is proposed. It is performed through the use of a method based on a multiple local fast Fourier transform for estimation of a local fringes period map and a 5-point spatial carrier phase shifting (SCPS) formula for phase modulo 2π-calculation. The described approach is verified by a correct demodulation of a real fringe pattern taken by a 3D-shape measurement system.

scholarly journals Pixelated Carrier Phase-Shifting Shearography Using Spatiotemporal Low-Pass Filtering Algorithm

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5185
Author(s):  
Peizheng Yan ◽  
Xiangwei Liu ◽  
Shuangle Wu ◽  
Fangyuan Sun ◽  
Qihan Zhao ◽  
...  
Keyword(s):  
Carrier Phase ◽  
Speckle Noise ◽  
Phase Shifting ◽  
Destructive Testing ◽  
Full Field ◽  
Filtering Algorithm ◽  
Real Time Measurement ◽  
Low Pass ◽  
Carrier Phase Shifting ◽  
Non Destructive

Shearography has been widely used in non-destructive testing due to its advantages in providing full-field, high precision, real-time measurement. The study presents a pixelated carrier phase-shifting shearography using a pixelated micropolarizer array. Based on the shearography, a series of shearograms are captured and phase maps corresponding to deformation are measured dynamically and continuously. Using the proposed spatiotemporal filtering algorithm in the complex domain, the set of phase maps are simultaneously low-pass filtered in the spatial and temporal domains, resulting in better phase quality than spatial low-pass filtering. By accumulating the temporally adjacent phase, the phase corresponding to large deformation can be evaluated; thus, large deformations can be accurately measured and protected from speckle noise, allowing internal defects to be easily identified. The capability of the proposed shearography is described by theoretical discussions and experiments.

Spatial-carrier phase shifting method of fringe analysis for moiré interferometry

1993 ◽  
Vol 28 (2) ◽  
pp. 79-88 ◽  
Author(s):  
C Y Poon ◽  
M Kujawinska ◽  
C Ruiz
Keyword(s):  
Carrier Phase ◽  
Field Measurements ◽  
Displacement Function ◽  
Moiré Interferometry ◽  
Phase Shifting ◽  
Moire Interferometry ◽  
Fringe Analysis ◽  
Automated Method ◽  
Phase Shifting Method ◽  
Carrier Phase Shifting

The theory of an automated fringe pattern analysis using the spatial-carrier phase shifting method for moiré interferometry is presented. The automated method is shown to provide a fast and accurate strain measurement over the whole field. Measurements on a brass specimen and a tapered laminated composite specimen are shown to highlight the efficiency and the capability of this technique for moiré interferometry. The filtering technique used to remove noise from the required displacement function is also presented.

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