Effective-focal-length calculations and measurements for a radial diffraction grating

Koch, J. A.; Cui, Steven; McNeill, Michael A.

doi:10.1364/josaa.16.002690

Cited by 3 publications

(1 citation statement)

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“…Usually, gratings for rotary optical encoders are engraved by lithographic methods on the plane facet of a cylinder [7,8]. The behavior of this kind of grating has been already analyzed in previous works [9,10]. On the other hand, rotary encoders with the grating engraved by laser ablation [11,12] on the external curved side of a steel cylinder have recently been developed [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Near field diffraction of cylindrical convex gratings

Torcal-Milla

Sanchez‐Brea

Bernabéu

2015

J. Opt.

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We analyze the field produced by a cylindrical convex diffraction grating at the Fresnel regime for several kinds of light sources, including a monochromatic quasipunctual source, finite size, and polychromatic sources. These results can help one understand the functioning of rotary optical encoder technology. A decrease in the self-image contrast is produced for finite nonpunctual sources. In addition, the polychromaticity of the source affects the smoothness of the self-images, making them quasicontinuous from a certain distance from the grating forward. Finally, we experimentally validate the obtained analytical predictions.

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Section: Introductionmentioning

confidence: 99%

Near field diffraction of cylindrical convex gratings

Torcal-Milla

Sanchez‐Brea

Bernabéu

2015

J. Opt.

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Refraction-enhanced x-ray radiography for inertial confinement fusion and laser-produced plasma applications

Koch

Landen

Kozioziemski

et al. 2009

Journal of Applied Physics

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We explore various laser-produced plasma and inertial confinement fusion applications of phase-contrast x-ray radiography, and we show how the main features of these enhancements can be considered from a geometrical optics perspective as refraction enhancements. This perspective simplifies the analysis and often permits simple analytical formulas to be derived that predict the enhancements. We explore a raytrace approach to various material interface applications, and we explore a more general example of refractive bending of x rays by an implosion plasma. We find that refraction-enhanced x-ray radiography of implosions may provide a means to quantify density differences across shock fronts as well as density variations caused by local heating due to high-Z dopants. We also point out that refractive bending by implosions plasmas can blur fine radiograph features and can also provide misleading contrast information on area-backlit pinhole imaging experiments unless its effects are taken into consideration.

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Determinant factors of Indonesian muslim behavior in choosing halal products

Gojali

Asih

2020

Innovative Marketing

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This research aims to examine the factors influencing the Indonesian Muslim community’s actions in choosing halal items. This objective is accomplished by evaluating the factors of variable creation that affect halal product selection. 183 Muslim respondents in Indonesia collected data for the study by filling out questionnaires. There are nine variables in the questionnaire survey segment: personal social perception, halal certification, halal awareness, trust, subjective norms, satisfaction, attitude, religiosity, and interest. Data were obtained based on participants’ availability and willingness to participate in selecting the questionnaire. The approach used is quantitative descriptive, namely, factor analysis, to determine the factors that form variables. One of the most important results is that the nine variables were selected to create an element that significantly influences people’s behavior in choosing halal items. Next are satisfaction, personal social perception, subjective norms, attitude, halal certification, interest, trust, and halal awareness. The religiosity variable results give the most significant contribution of importance in shaping the variables. AcknowledgmentAuthors acknowledge the Covenant Faculty of Economics and Business of UIN Sunan Gunung Djati Bandung, who has supported this research.

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Effective-focal-length calculations and measurements for a radial diffraction grating

Cited by 3 publications

References 10 publications

Near field diffraction of cylindrical convex gratings

Near field diffraction of cylindrical convex gratings

Refraction-enhanced x-ray radiography for inertial confinement fusion and laser-produced plasma applications

Determinant factors of Indonesian muslim behavior in choosing halal products

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