Measurement of out-of-plane vibrations by processing digital speckle pattern interferometry fringes using wavelet transform

2002 ◽  
Author(s):  
Chandra Shakher ◽  
Rajesh Kumar
Keyword(s):  
Wavelet Transform ◽  
Speckle Pattern ◽  
Digital Speckle Pattern Interferometry ◽  
Out Of Plane ◽  
Digital Speckle

Simultaneous Measurement of In-Plane and Out-of-Plane Deformations Using Dual-Beam Spatial-Carrier Digital Speckle Pattern Interferometry

2015 ◽  
Vol 782 ◽  
pp. 316-325 ◽  
Author(s):  
Kai Liu ◽  
Si Jin Wu ◽  
Xin Ya Gao ◽  
Lian Xiang Yang
Keyword(s):  
High Speed ◽  
Phase Retrieval ◽  
Speckle Pattern ◽  
High Tech ◽  
Advanced Technique ◽  
Digital Speckle Pattern Interferometry ◽  
Dual Beam ◽  
Out Of Plane ◽  
Digital Speckle ◽  
Plane Deformations

Digital speckle pattern interferometry (DSPI) is an advanced technique for both in-plane and out-of-plane deformation measurements of diffuse surfaces in nanoscale. It has been widely used in aerospace engineering and other high-tech industries due to the advantages of non-contact, high-accuracy and full-field measurement. Traditionally, DSPI uses temporal phase shifting method to achieve precise deformation measurement, but it is only suitable for quasi-static deformation. Spatial-carrier method is another effective phase retrieval method used in DSPI and its validity has been verified in some DSPI setups. DSPI with spatial-carrier method enjoys the advantages of simple optical arrangement, easy operation, and above all, high-speed measurement of deformation. This paper introduces a dual-beam spatial-carrier digital speckle pattern interferometry system, with which in-plane and out-of-plane deformations can be measured simultaneously as well as quickly. In the optical setup, two lasers are employed to illuminate the measured object with different illumination angles, and two single-mode fibers server as carriers to transmit the reference beams. In-plane and out-of-plane deformations can be obtained by combining the phase maps of both channels. Theoretical discussion and experimental analysis are both presented.

Measurement of out-of-plane deformation of curved objects with digital speckle pattern interferometry

2018 ◽  
Vol 16 (11) ◽  
pp. 111202
Author(s):  
Pengfei Li Pengfei Li ◽  
Ping Cai Ping Cai ◽  
Jun Long Jun Long ◽  
Chiyue Liu Chiyue Liu ◽  
Hao Yan Hao Yan
Keyword(s):  
Speckle Pattern ◽  
Plane Deformation ◽  
Digital Speckle Pattern Interferometry ◽  
Out Of Plane ◽  
Digital Speckle ◽  
Curved Objects
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