DHI contemporary methodologies: A review and frontiers

Flores-Moreno, J. M.; Torre-Ibarra, Manuel De la; Hernandez-Montes, Maria del Socorro; Santoyo, Fernando Mendoza

doi:10.1016/j.optlaseng.2020.106184

Cited by 14 publications

(3 citation statements)

References 136 publications

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“…The unique properties of holographic recording using digital cameras are now in demand in many fields of science and technology [1,2], such as microscopy [3], information encryption [4], metrology [5], interferometry [6], threedimensional (3D) visualization [7], non-destructive testing [8], etc. The principle of such digital holographic recording is to register an interference pattern formed by two usually coherent particle tracking [23], data compression [24] and packaging [25], plastic degradation monitoring [26], vibration analysis [27,28], etc are among other digital holography applications.…”

Section: Introductionmentioning

confidence: 99%

An optical-digital method of noise suppression in digital holography

Cheremkhin

Evtikhiev²,

Kozlov³

et al. 2022

J. Opt.

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Digital holography is widely used for the fast and accurate reconstruction of objects and 3D-scenes characteristics: intensity, depth locations, density, temperature, refractive index, etc. There are various types of noise in digital holography, including speckle noise, zero order and twin image, camera shot noise and fixed-pattern noise. Therefore, additional hologram processing is required to obtain a high-quality reconstructed image. This paper proposes an optical-digital method of noise suppression in digital holography. First, a set of uncorrelated holograms is registered. The reconstructed images are treated as a 3D array, to which a 3D filter is then applied. A 3D median filter is used in this study; however, other 3D filters based on weighted average can be utilized also. The proposed method was verified using computer-generated and optically registered digital Fresnel holograms. Even with a small number of images, the method significantly improves the quality: the normalized standard deviation was decreased by up to 3-10 times and speckle contrast was reduced by more than six times. Registration of only ten holograms is sufficient to obtain a quality close to the maximum. The flexibility of the proposed method allows for varying the ratio of the reconstruction quality to the processing time.

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Section: Introductionmentioning

confidence: 99%

An optical-digital method of noise suppression in digital holography

Cheremkhin

Evtikhiev²,

Kozlov³

et al. 2022

J. Opt.

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“…Digital holography [1] allows us to register information about 3D objects and obtain their characteristics with a high spatial [2] or temporal resolution [3]: amplitude and phase [4], fluorescence information [5], mass and osmolarity [6], position in the volume of the medium [7], defect inspection [8], surface deformation [9], refractive index [10], etc. Binarization is one of the popular technologies in digital and computersynthesized holography .…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of off-axis digital hologram binarization by error diffusion

Cheremkhin

Курбатова

Evtikhiev

et al. 2021

J. Opt.

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A digital micromirror device (DMD) provides 2D- and 3D-scene reconstruction by displaying diffractive and holographic optical elements. The highest frame rates (tens of thousands of Hz) can be achieved if the displayed optical elements are binarized. Except for DMD applications, hologram binarization is useful for display creation, image encryption, information compression and storage, fast 3D printing, etc. Error diffusion is one of the most qualitative implementations of hologram binarization. In this paper, three group's weighting matrices of error diffusion are analyzed: 16 standard, eight dot and six diagonal matrices. Thus, 30 error diffusion methods were used for optically recorded off-axis digital hologram binarization. The quality of the image reconstruction from the binarized holograms was compared. Direct applications of error diffusion with large weighting matrices and dot diffusion provide the highest reconstruction quality. Seven metrics were used as the error diffusion threshold. Twelve bypass directions of error diffusion were analyzed. In addition, the joint application of Otsu threshold and complex bypass directions allows us to improve the quality of hologram binarization by 15%.

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“…Метод голографической интерферометрии [7] обладает высокой чувствительностью и применим к объектам любой формы. При использовании двойной экспозиции точность измерения высокая, но отсутствует возможность регистрации непрерывных динамических процессов.…”

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Study of the stress-strain and temperature fields in cutting tools using laser interferometry

Efimovich¹,

Золотухин²

2021

Metal Working and Material Science

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Introduction. The efficiency of the metalworking processes highly depends on the performance of the implemented cutting tools that can be increased by studying its stress-strain state and temperature fields. Existing stress analysis methods either have a low accuracy or are inapplicable for research during the operation of the tools made of materials with high mechanical properties. In addition, the study of temperature fields using known methods is difficult due to the small size of the cutting zone, high temperatures, and a heavy temperature gradient appearing during metal cutting. The purpose of this study is to develop new experimental methods for measuring the stress-strain and temperature fields in the cutting tool during its operation using laser interferometry. The methods include: obtaining interference fringe patterns using an interferometer with the original design, obtaining the tool deformation field during the cutting process by recording the changes in interference fringe patterns using a high-speed camera, processing fringe patterns with the separation of deformations caused by heating and cutting forces, and calculating temperature fields and stress distributions using mechanical properties and the coefficient of thermal expansion of the tool material. The advantages of the developed methods include: applicability under real operating conditions of the cutting tool, ability to study the non-stationary stress-strain state and temperatures during an operation, and achievement of a high spatial resolution and a small field of view for the investigated surface. Results and Discussion. The experimental study confirmed the efficiency of the methods. The results of the study included the fields of stresses and temperatures obtained during the orthogonal cutting of heat-resistant steel with a tool made of cemented tungsten carbide WC-8Co. The developed methods can be used to study the cutting tool efficiency at close to real conditions and in obtaining boundary conditions for the study stress-strain state of a workpiece material near the cutting zone.

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DHI contemporary methodologies: A review and frontiers

Cited by 14 publications

References 136 publications

An optical-digital method of noise suppression in digital holography

An optical-digital method of noise suppression in digital holography

Comparative analysis of off-axis digital hologram binarization by error diffusion

Study of the stress-strain and temperature fields in cutting tools using laser interferometry

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