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Principles of Digital Speckle Pattern Interferometry
2015The invention of the laser in 1960 allowed for the availability, as never before, of light sources with a high degree of coherence. Researchers working with this kind of light source noticed that a strange phenomenon was produced: when a rough surface is illuminated with laser light, a high-contrast and finescale granular pattern is observable.1 This ...
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Double-pulse digital speckle pattern interferometry for vibration analysis
SPIE Proceedings, 2014The double-pulse Digital Speckle Pattern Interferometry (DSPI) in the laboratory is established. Two good performances have been achieved at the same time, which is uniform distribution of laser beam energy by space filter and recording two successive pictures by a CCD camera successfully.
Dazhi Zhang +4 more
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Digital speckle pattern interferometry as a holographic velocimetry technique
Measurement Science and Technology, 2004In this paper digital speckle pattern interferometry (DSPI) as a digital image plane holography (DIPH) technique is presented and its potential for fluid velocimetry are discussed. The recording is carried out with a spatial phase shifting (SPS) DSPI set-up, which can also be viewed as an off-axis DIPH set-up.
J Lobera, N Andrés, M P Arroyo
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International Instrumentation and Measurement Technology Conference, 2019
Digital speckle pattern interferometry (DSPI) is an optical measurement technique for deformation detection of composite materials. In this techniques, the traditional phase extraction method requires unwrapping, which leads to the reduction of ...
Qiyang Xiao +4 more
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Digital speckle pattern interferometry (DSPI) is an optical measurement technique for deformation detection of composite materials. In this techniques, the traditional phase extraction method requires unwrapping, which leads to the reduction of ...
Qiyang Xiao +4 more
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International Symposium on Precision Mechanical Measurements, 2019
Digital speckle pattern interferometry (DSPI) is a high-precision measurement method for measuring the surface deformation of an object. Compared with other measurement techniques, it has the advantages of full-field measurement, real-time, non-contact ...
Fengqing Bao +4 more
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Digital speckle pattern interferometry (DSPI) is a high-precision measurement method for measuring the surface deformation of an object. Compared with other measurement techniques, it has the advantages of full-field measurement, real-time, non-contact ...
Fengqing Bao +4 more
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Research on the pattern evaluation in the digital speckle pattern interferometry
SPIE Proceedings, 2011Digital Speckle Pattern Interferometry (DSPI) is one of modern optical measurement techniques. It has the advantage of non-contacting, whole field, high measurement accuracy and without special process of the surface to be measured. With the development of computer science and electronics, DSPI is used more and more widely.
Yonghong Wang +4 more
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Digital speckle-pattern interferometry as a full-field fluid-velocimetry technique
Optics Letters, 1999We present a novel fluid-velocimetry technique based on speckle interferometry. The light scattered from an illuminated plane is recorded with a CCD camera at the same time as a speckled reference beam. Substraction of two nonsimultaneous frames provides information about the velocity field for an out-of-plane component.
N, Andrés +3 more
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Holographic optical elements for combined holographic and digital speckle pattern interferometry
SPIE Proceedings, 2003Holographically recorded diffractive optical elements are described, which can be used to implement very simple self-aligning electronic speckle pattern interferometers (ESPI) and holographic interferometers requiring only a laser source and a CCD camera in the optical set-up.
Guntaka, S. R. +3 more
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Digital speckle-pattern interferometry with an aperture sampling technique
Annual Meeting Optical Society of America, 1986Digital speckle-pattern interferometry (DSPI) using digital subtraction offers several advantages over conventional electronic speckle-pattern interferometry (ESPI) that utilizes high-pass filtering techniques.1 However, previous approaches require the use of a reference beam which makes the system more complicated and sensitive to system instability ...
Anthony M. Tai +2 more
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Embedded Digital Speckle Pattern Interferometry for Three-dimensional Strain Analysis
Experimental Mechanics, 2008The extension of Digital Speckle Pattern Interferometry to three-dimensional cases poses new challenges from both the practical and the theoretical points of view. In the present research, a scattering surface was created within a transparent Plexiglas specimen with the aid of atomized aluminum particles, and strain was measured in the interior plane ...
G. Restivo, G.L. Cloud
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