MECHANISMS OF FORMATION OF HIGH-FREQUENCY RELIEF HOLOGRAPHIC GRATINGS ON DICHROMATED GELATIN EXPOSED TO SHORT-WAVE UV RADIATION

2020 ◽  
Keyword(s):  
Uv Radiation ◽  
High Frequency ◽  
Short Wave ◽  
Holographic Gratings ◽  
Mechanisms Of Formation ◽  
Dichromated Gelatin

High-Frequency Relief-Phase Holographic Gratings on Dichromated Gelatin Processed by Short-Wave UV Radiation

2019 ◽  
Vol 45 (6) ◽  
pp. 613-615 ◽  
Author(s):  
N. M. Ganzherli ◽  
S. N. Gulyaev ◽  
I. A. Maurer ◽  
D. R. Khazvalieva
Keyword(s):  
Uv Radiation ◽  
High Frequency ◽  
Short Wave ◽  
Holographic Gratings ◽  
Dichromated Gelatin ◽  
Relief Phase

Регистрация высокочастотных рельефно-фазовых голографических структур на фотоматериале ПФГ-04

2021 ◽  
Vol 47 (21) ◽  
pp. 13
Author(s):  
Н.М. Ганжерли ◽  
С.Н. Гуляев ◽  
И.А. Маурер ◽  
А.В. Архипов
Keyword(s):  
Spatial Frequency ◽  
Uv Radiation ◽  
Diffraction Efficiency ◽  
High Frequency ◽  
Short Wave ◽  
Destructive Effect ◽  
Holographic Gratings ◽  
New Variant ◽  
First Time ◽  
Relief Phase

A new variant of processing photographic plates for holography based on dichromed gelatin PFG-04 (produced by JSC "Slavich Company", Pereslavl-Zalessky) for the manufacture of high-frequency relief–phase holographic gratings with a spatial frequency up to 1500 mm-1 is proposed. The technology is based on the selective destructive effect of short-wave UV radiation on gelatin and subsequent etching of the layer with various reagents. For the first time, relief-phase high-frequency holographic gratings with a maximum diffraction efficiency of 67% were obtained on PFG-04 photographic plates.

scholarly journals Высокочастотные рельефно-фазовые голографические решетки на обработанном коротковолновым УФ-излучением бихромированном желатине

2019 ◽  
Vol 45 (12) ◽  
pp. 30
Author(s):  
Н.М. Ганжерли ◽  
С.Н. Гуляев ◽  
И.А. Маурер ◽  
Д.Р. Хазвалиева
Keyword(s):  
Spatial Frequency ◽  
Uv Radiation ◽  
High Spatial Frequency ◽  
Short Wave ◽  
Destructive Effect ◽  
Holographic Gratings ◽  
First Time ◽  
Relief Phase

For the first time, the possibility of creating relief-phase holographic gratings with a high spatial frequency of 1500 mm-1 on dichromate gelatin (DCG) layers using the destructive effect of short-wave UV radiation on gelatin is shown.

scholarly journals Применение термообработки при формировании рельефно-фазовых голографических структур на бихромированном желатине

2020 ◽  
Vol 128 (10) ◽  
pp. 1507
Author(s):  
Н.М. Ганжерли ◽  
С.Н. Гуляев ◽  
И.А. Маурер
Keyword(s):  
High Temperature ◽  
Water Treatment ◽  
Spatial Frequency ◽  
Uv Radiation ◽  
Short Wave ◽  
Coherent Radiation ◽  
Steady Increase ◽  
Spatial Frequencies ◽  
Dichromated Gelatin ◽  
Relief Phase

A new method is proposed for the formation of a relief phase holographic structure on layers of dichromated gelatin (DCG). The method is based on the application of two types of alternative effects on gelatin: structuring using selective light tanning with coherent radiation from a He-Cd laser and destruction by irradiating the layers with short-wave UV radiation. To obtain highly effective holographic relief structures in the region of high spatial frequencies, up to 1500 mm–1, a time-shortened water treatment of samples, interrupted by an isopropanol bath, was previously proposed. In this paper, it is proposed to abandon the water treatment of DCG layers and replace it with heating the sample during irradiation with short-wave UV radiation. In the course of experiments, a steady increase in the diffraction efficiency was obtained regardless of the spatial frequency and thickness of the DCG layer, which is explained by the formation of a relief holographic structure due to evaporation and shrinkage of gelatin areas destroyed by UV radiation under the influence of high temperature.

Effect of rail pad stiffness on the wheel/rail force intensity in a railway slab track with short-wave irregularity

2019 ◽  
Vol 233 (10) ◽  
pp. 1038-1049 ◽  
Author(s):  
Amin Khajehdezfuly
Keyword(s):  
High Frequency ◽  
Critical Speed ◽  
Concrete Slab ◽  
Low Frequency ◽  
Short Wave ◽  
Vehicle Speed ◽  
Frequency Range ◽  
Slab Track ◽  
High Frequency Excitation ◽  
Frequency Excitation

In this paper, a two-dimensional numerical model is developed to investigate the effect of rail pad stiffness on the wheel/rail force in a slab track with harmonic irregularity. The model consists of a vehicle, nonlinear Hertz spring, rail, rail pad, concrete slab, resilient layer, concrete base, and subgrade. The rail is simulated using the Timoshenko beam element for considering the effects of high-frequency excitation produced by short-wave irregularity. The results obtained from the model are compared with those available in the literature and from the field to prove the validity of the model. Through a parametric study, the effect of variations in rail pad stiffness, vehicle speed, and harmonic irregularity on the wheel/rail force is investigated. For the slab track without any irregularity, the wheel/rail force is at maximum when the vehicle speed reaches the critical speed. As the rail pad stiffness increases, the critical speed increases. When the amplitude of irregularity is high, wheel jumping phenomenon may occur. In this situation, as the vehicle speed and rail pad stiffness are increased, the dynamic wheel/rail force is increased. In the low-frequency range, the wheel/rail force increases as the rail pad stiffness increases. In the high-frequency range, the wheel/rail force increases as the rail pad stiffness is decreased.

Design of readout IC for photoelectron detector of short-wave high frequency IRFPA

2013 ◽  
Author(s):  
Pan Wang ◽  
Rui-jun Ding ◽  
Guo-qiang Chen ◽  
Honglei Chen
Keyword(s):  
High Frequency ◽  
Short Wave

scholarly journals Flare-associated bursts at 18 Mc/s

1959 ◽  
Vol 9 ◽  
pp. 203-207
Author(s):  
Constance Warwick ◽  
J. W. Warwick
Keyword(s):  
High Frequency ◽  
Short Wave ◽  
Radio Noise

The occurrence of increased radio noise at the onset of short-wave fadeouts (SWF's) was noted by Appleton [1], who attributed the enhancements to solar emission. Payne-Scott [2], observing at about 19 Mc/s, measured burst intensities and times of occurrence to compare these high-frequency phenomena with radio events in the VHF range from 50 to 100 Mc/s.

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