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From speckle pattern photography to digital holographic interferometry [Invited]
Applied Optics, 2012Speckles are inherently an interference phenomenon produced when an optically rough surface or a turbulent medium introduces some degree of randomness to a reflected or a transmitted electromagnetic field. Speckles are often nuisance in coherent image formation.
Hans J, Tiziani, Giancarlo, Pedrini
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Digital processing of electronic speckle pattern interferometry addition fringes
Applied Optics, 1994A digital image-processing method for analyzing double-pulsed electronic speckle pattern interferometry addition fringes is described. The procedure consists of three steps, forming a combination particularly suited to addressing some important practical limitations of the measurement system.
A, Davila, D, Kerr, G H, Kaufmann
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Vibration measurement of musical instruments using digital speckle pattern shearing interferometry
International Conference on Optical and Photonic EngineeringThe structure and material of a musical instrument decisively influence its vibration modes. In turn, the precise measurement of vibration aiding in analyzing the structural and material properties of the musical instrument, and ultimately provides a ...
Ke Xu, Sijin Wu, Weixian Li
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Measuring velocity of speckle fields with digital speckle pattern interferometry
Optics Communications, 1999Abstract We investigate a digital method for detecting the velocity of a diffusing object. The technique is based on Digital Speckle Pattern Interferometry (DSPI). A set of reference fringes is generated externally through the reference beam in a digital interferometer.
Claudia Carletti +2 more
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Journal of Theoretical and Applied Mechanics
In this contribution, electronic speckle pattern interferometry (ESPI) and digital image correlation (DIC) are combined for strain analysis around a notch. The investigations are demonstrated using an epoxy notched cantilever bending beam.
Thomas Lehmann, J. Ihlemann
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In this contribution, electronic speckle pattern interferometry (ESPI) and digital image correlation (DIC) are combined for strain analysis around a notch. The investigations are demonstrated using an epoxy notched cantilever bending beam.
Thomas Lehmann, J. Ihlemann
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Detection of corrosion by digital speckle pattern interferometry
SPIE Proceedings, 2006It has been recently shown that application of Michelson interferometry, is suitable for monitoring of oxide layers growing in metallic structures during preliminary states of oxidation processes in aqueous solutions, without any physical contact with the sample. The qualitative and quantitative interpretation of the observed interferograms allows
D. Mayorga-Cruz +2 more
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NDT & E international, 2019
In this paper, a new method, Moment-Stiffness Method (MSM), is proposed for measuring the edge and depth of internal defects which can be applied to any structures with known stiffness.
Congcong Lv, Kaifu Wang, G. Gu, Yun Pan
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In this paper, a new method, Moment-Stiffness Method (MSM), is proposed for measuring the edge and depth of internal defects which can be applied to any structures with known stiffness.
Congcong Lv, Kaifu Wang, G. Gu, Yun Pan
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Optics Express
High-precision phase retrieval in digital speckle pattern interferometry is fundamentally limited by speckle decorrelation noise, which degrades measurement reliability in complex environments.
Peizheng Yan +5 more
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High-precision phase retrieval in digital speckle pattern interferometry is fundamentally limited by speckle decorrelation noise, which degrades measurement reliability in complex environments.
Peizheng Yan +5 more
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Precision roll angle measurement based on digital speckle pattern interferometry
Measurement science and technology, 2019An approach to precise measurement of small roll angle based on digital speckle pattern interferometry (DSPI) is introduced. A simple relationship between the roll angle and interferometric phase distribution is established by analyzing the mechanism of ...
Sijin Wu +4 more
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Vibration-observation techniques for digital speckle-pattern interferometry
Journal of the Optical Society of America A, 1985Vibration observation is a major application of digital speckle-pattern interferometry (DSPI), which is a variation on electronic speckle-pattern interferometry (ESPI). DSPI processes speckle patterns in a computer rather than with a frame grabber and analog electronics as in ESPI.
Katherine Creath, Gudmunn Å. Slettemoen
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