Speckle interferometry experiments with a digital photocamera

Vannoni, Maurizio; Molesini, Giuseppe

doi:10.1119/1.1643375

Cited by 18 publications

(15 citation statements)

References 6 publications

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“…The wave function interference pattern in figure bears some resemblance to an optical speckle pattern observed in coherent scattering of a laser beam from a rough surface . In the case the optical speckle patterns, the unknown, but fixed phases are introduced into the optical pathways via the uncontrolled roughness of the fixed surface, i.e.…”

Section: Resultsmentioning

confidence: 80%

Model mechanisms in Kikuchi pattern formation from crystals

Winkelmann

2017

Crystal Research and Technology

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In diffraction experiments on crystals, different types of diffraction patterns can be observed. Depending on various factors like the scattering energy, scattering geometry, sample temperature, or structural disorder, one can observe a combination of discrete diffraction patterns caused by coherent scattering of the incident beam and a structured background formed by patterns which can be explained by emission from internal incoherent sources inside the crystal. For the case of electron diffraction, these patterns from incoherent internal sources are called Kikuchi patterns. It will be shown here that the transition from the discrete coherent electron diffraction patterns to Kikuchi patterns, as well as similar effects in X-ray and neutron diffraction, can be analyzed qualitatively by a simple model involving a twostep scattering process. An elementary double-scattering model is presented extending the kinematic model of X-ray diffraction. The double-scattering model outlines the key mechanism that can destroy the coherence between the first scatterers while at the same time some coherence can be preserved in the secondary scattering pathways starting at each of the individual first scatterers, respectively. In this way, the model presented here highlights some non-trivial experimental effects of coherence loss under conditions of multiple scattering of waves in crystals.

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Section: Resultsmentioning

confidence: 80%

Model mechanisms in Kikuchi pattern formation from crystals

Winkelmann

2017

Crystal Research and Technology

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“…in order to meet certain accuracy in the measurements [3]. Experiments with low-cost devices such as a digital camera and a diode laser have been reported [4][5][6][7]. In order to measure the two perpendicular displacement directions with ESPI, it is necessary to develop a two in-plane measurement setup [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Application of Electronic Speckle Pattern Interferometry Method for Simultaneous Measurement of Young’s Modulus and the Poisson’s Ratio of Metals

Michtchenko

2018

The 18th International Conference on Experimental Mechanics

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In this paper, mechanical experiments with a low-cost interferometry set-up are presented. The set-up is suitable for an undergraduate laboratory where optical equipment is absent. The arrangement consists of two planes of illumination, allowing the measurement of the two perpendicular in-plane displacement directions. An axial load was applied to three different metals, and the longitudinal and transversal displacements were measured sequentially. A digital camera was used to acquire the images of the different states of the load of the illuminated area. A personal computer was used to perform the digital subtraction of the images to obtain the fringe correlations, which are needed to calculate the displacements. Finally, Young’s modulus and Poisson’s ratio of the metals were calculated using the displacement data.

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“…It is possible to determine mathematical parameters that characterize by mapping the images obtained by common cameras such as: cell phones, smartphone, tablet, iphone, ipad, webcam, etc. As filming obtained by optical CCD reader [2,3,4] theses hardware, form decoded and separated into their quantified RGB E color channels. Our technique consists of the analysis of the pixels of the images of primary light sources, such as: the sun, incandescent lamps, fire, candle flames [5,6,7,8], matchestick flame, wood combustion, etc.…”

Section: Introductionmentioning

confidence: 99%

Alternative Method of RGB Channel Spectroscopy Using a CCD Reader

Gobato

Filho²

2017

CeN

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Spectroscopy is a technique for collecting physicochemical data through the transmission, absorption or reflection of incident radiant energy in a sample. Our work is used in common low cost and easy access devices that have a CCD reader. Our idea is a set of devices, such as a cell phone, which contains an optical CCD reader, where these equipment materials, materials, compounds, simplifying the image obtained by these optical devices. As filming obtained by optical CCD reader theses hardware, form decoded and separated into their quantified RGB color channels. Our initial technique consists of the analysis of the pixels of the images of primary light sources, such as: the sun, incandescent lamps, fire, candle flames, matchestick flame, wood combustion, etc. We conclude that it is possible to do a spectroscopic analysis using our technique.

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Speckle interferometry experiments with a digital photocamera

Cited by 18 publications

References 6 publications

Model mechanisms in Kikuchi pattern formation from crystals

Model mechanisms in Kikuchi pattern formation from crystals

Application of Electronic Speckle Pattern Interferometry Method for Simultaneous Measurement of Young’s Modulus and the Poisson’s Ratio of Metals

Alternative Method of RGB Channel Spectroscopy Using a CCD Reader

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