Results 21 to 30 of about 11,614 (198)
DSPI Filtering Evaluation Method Based on Sobel Operator and Image Entropy
IEEE Photonics Journal, 2021 Evaluating the filtering process of the digital speckle pattern interferometry (DSPI) of a single image by the traditional methods can result in under- or over-filtering.
Runkai Zhang +3 more
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Applied Sciences, 2022 This article presents the results of numerical finite element method (FEM) simulations in the Ansys environment of a Boston orthopaedic brace. The geometric model was developed based on the results of digitisation performed by means of a three ...
Slawomir Grycuk, Piotr Mrozek
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Digital Double-Pulse Holographic Interferometry for Vibration Analysis
Shock and Vibration, 1996 Different arrangements for double-pulsed holographic and speckle interferometry for vibration analysis will be described. Experimental results obtained with films (classical holographic interferometry) and CCD cameras (digital holographic interferometry)
H.J. Tiziani, G. Pedrini
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Phase-sensitive interferometry of decorrelated speckle patterns [PDF]
Scientific Reports, 2019 AbstractPhase-sensitive coherent imaging exploits changes in the phases of backscattered light to observe tiny alterations of scattering structures or variations of the refractive index. But moving scatterers or a fluctuating refractive index decorrelate the phases and speckle patterns in the images.
Hillmann, Dierck +6 more
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Michelson Interferometry with the Keck I Telescope [PDF]
, 2000 We report the first use of Michelson interferometry on the Keck I telescope for diffraction-limited imaging in the near infrared JHK and L bands. By using an aperture mask located close to the f/25 secondary, the 10 m Keck primary mirror was transformed ...
Buscher D. +22 more
core +2 more sources
Extended-range temporal electronic speckle pattern interferometry [PDF]
Applied Optics, 2002 In recent years the availability of high-speed digital video cameras has motivated the study of electronic speckle pattern interferometry (ESPI) in the time domain. To this end a properly sampled temporal sequence of N-fringe patterns is used to analyze the temporal experiment.
Quiroga Mellado, Juan Antonio +2 more
openaire +4 more sources
Digital Shearing Speckle Pattern Interferometry Based on Rochon Prism and Its Application
Applied Sciences, 2019 This paper presents improved digital shearing speckle pattern interferometry based on Rochon Prism. The advantage of this method is that it avoids the shadow noise caused by transmission light, which improves the shearography accuracy.
Xu Wang +7 more
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Dynamic speckle - Interferometry of micro-displacements [PDF]
, 2012 The problem of the dynamics of speckles in the image plane of the object, caused by random movements of scattering centers is solved. We consider three cases: 1) during the observation the points move at random, but constant speeds, and 2) the relative ...
Vladimirov, A. P.
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Artificial Neural Networks Application in Modal Analysis of Tires
Measurement Science Review, 2013 The paper deals with the application of artificial neural networks (ANN) to tires’ own frequency (OF) prediction depending on a tire construction. Experimental data of OF were obtained by electronic speckle pattern interferometry (ESPI).
Koštial P. +5 more
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Residual stress measurement on the butt-welded area by electronic speckle pattern interferometry
Nuclear Engineering and Technology, 2015 Background: Residual stress always exists on any kind of welded area. This residual stress can cause the welded material to crack or fracture. For many years, the hole-drilling method has been widely used for measuring residual stress.
Kyeongsuk Kim +3 more
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