scholarly journals Вычислительный эксперимент по моделированию распространения света в волокнистой профилированной структуре

Author(s):  
V. V. Savchenko ◽  
M. A. Savchenko

Many studies show that profiled structures are the source of attaining desired system characteristics in industrial or other applications. In this short note, we continue considering proposed recently by us the profiled structure such as a beach umbrella based on the principles of origami design. To demonstrate the optical properties of the given model, a developed recursive ray tracing algorithm is used to simulate the propagation of light rays through the modelled paper fiber sample. In this paper, modeling light propagation through a porous structure using ray tracing technique is presented and results of modeling light propagation in a profiled structure with respect to simulated light propagation in fiber structure are discussed. Во многих работах указывается, что использование профилированных структур позволяет получить характеристики материала, необходимые для его применения в промышленности и других областях. В этой небольшой статье мы продолжаем рассматривать предложенную нами недавно профилированную структуру в виде пляжного зонта, основанную на принципах дизайна оригами. Для демонстрации оптических свойств данной модели используется разработанный алгоритм рекурсивной трассировки лучей для моделирования распространения световых лучей через смоделированный образец бумажного волокна. В этой статье представлено моделирование распространения света через пористую структуру с использованием техники трассировки лучей, а также обсуждаются результаты моделирования распространения света в профилированной структуре в сравнении с моделированным распространением света в волокнистой структуре.

2019 ◽  
Vol 34 (04) ◽  
pp. 1950029
Author(s):  
Siamak Akhshabi

We investigate the propagation of light rays and evolution of optical scalars in gauge theories of gravity where torsion is present. Recently, the modified Raychaudhuri equation in the presence of torsion has been derived. We use this result to derive the basic equations of geometric optics for several different interesting solutions of the Poincaré gauge theory of gravity. The results show that the focusing effects for neighboring light rays will be different than general relativity. This in turn has practical consequences in the study of gravitational lensing effects and also in determining the angular diameter distance for cosmological objects.


2010 ◽  
Vol 56 (198) ◽  
pp. 614-624 ◽  
Author(s):  
T.J. Fudge ◽  
Benjamin E. Smith

AbstractBorehole optical stratigraphy (BOS) is a borehole video system and processing routine for investigating polar firn. BOS records brightness variations in the firn and is effective at identifying stratigraphic markers. BOS brightness logs have been used to count annual layers and measure vertical strain, even though a specific cause of the brightness variations has not been determined. Here we combine two models of light transport to examine potential errors with BOS and identify improvements which will allow the system to estimate optical grain size. We use a Monte Carlo radiative transfer model to estimate the influence of firn microstructure variations on borehole reflectance. We then use a ray-tracing algorithm to model the multiple reflections within the borehole that cause measured brightness variations. Multiple reflections cause the brightness measured at a point on the borehole wall to not necessarily be equal to the local wall reflectance. The ray tracing further shows that wall imperfections or variations in the camera position can produce brightness variations that are unrelated to changes in firn properties. Smooth walls and good stabilization of the camera help ensure that brightness variations result from variations in firn properties, and thus are a measure of firn stratigraphy, rather than artifacts.


2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
S H Hendi ◽  
Z S Taghadomi ◽  
A Ghasempour Ardakani

Abstract Motivated by the investigation of a black hole’s properties in the lab, some interesting subjects such as analogue gravity and transformation optics are generated. In this paper, we look for analogies between the geometry of a gravitating system and the optical medium. In addition, we recognize that appropriate two-dimensional metamaterials can be used to mimic the propagation of light in the curved spacetimes and behave like black holes which are incident with light rays in the equatorial plane. The resemblance of metamaterials with Kerr and Reissner–Nordström spacetimes is studied. Finally, we compare the results of two-dimensional simulation for light propagation in the corresponding two-dimensional metamaterials with those obtained from the geometrical optical limit.


Author(s):  
Dmitriy Zhdanov ◽  
Igor' Potemin ◽  
Andrey Zhdanov ◽  
Vladimir Galaktionov

Nowadays, virtual tests of optical systems with holographic elements are being used more and more. Despite the fact that holographic optical elements have existed for decades and most programs for designing optical systems include ray tracing modules in optical systems containing holographic elements, the synthesis of realistic images formed by these systems is absent in most of these programs. The paper presents the results of a study of the possibility of implementing an effective and physically accurate stochastic ray tracing through hologram optical elements. The theoretical foundations of the light propagation through hologram optical elements are considered and a detailed ray tracing algorithm for its implementation in forward, backward and bidirectional stochastic ray tracing methods are presented. The results of modeling the propagation of rays and the synthesis of a realistic image formed by a two-hologram augmented reality system are presented. Also, we conducted a study of the influence of the observer's eye pupil position on the quality of the formed image.


2020 ◽  
Vol 238 ◽  
pp. 02005
Author(s):  
Robert A.M. van Gestel ◽  
Martijn J.H. Anthonissen ◽  
Jan H.M. ten Thije Boonkkamp ◽  
Wilbert L. IJzerman

In this contribution an alternative method to standard forward ray-tracing is briefly outlined. The method is based on a phase-space description of light propagating through an optical system. The propagation of light rays are governed by Hamilton’s equations. Conservation of energy and étendue for a beam of light, allow us to derive a Liouville’s equation for the energy propagation through an optical system. Liouville’s equation is solved numerically using an hp-adaptive scheme, which for a smooth refractive index field is energy conservative. A proper treatment of optical interfaces ensures that the scheme is energy conservative over the full domain.


Author(s):  
Wang Jun-Feng ◽  
Ding Gang-Yi ◽  
Wang Yi-Ou ◽  
Li Yu-Gang ◽  
Zhang Fu-Quan

2014 ◽  
Author(s):  
Guojin Feng ◽  
Ping Li ◽  
Yingwei He ◽  
Yu Wang ◽  
Houping Wu

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