A Running Strategy on Generating the Intersecting Information by Ray Tracing for the FDTD Method

2019 ◽  
Author(s):  
Xi Chao Bo ◽  
Jian Feng Zhang ◽  
Tie Jun Cui
Keyword(s):  
Ray Tracing ◽  
Fdtd Method

scholarly journals Study of the Optical Properties of Multi-Particle Phosphors by the FDTD and Ray Tracing Combined Method

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 126
Author(s):  
Xinrui Ding ◽  
Changkun Shao ◽  
Shudong Yu ◽  
Binhai Yu ◽  
Zongtao Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ray Tracing ◽  
Large Scale ◽  
Fdtd Method ◽  
Particle Method ◽  
Previous Method ◽  
Scattering Data ◽  
Particle Scattering ◽  
Scattering Parameter ◽  
Light Emitting

It is well known that the optical properties of multi-particle phosphor are crucial to the light performance of white light-emitting diodes (LEDs). Note that the optical properties including scattering or absorption properties for a single particle are easy to be calculated. However, due to the large computation considering the complicated re-scattering and re-absorption, it is difficult to calculate the scattering behaviors of the multi-particles. A common method to reduce the computation, which can cause unknown deviations, is to replace the multi-particle scattering properties by using the average scattering data of single particles. In this work, a cluster of multi-phosphor particles are directly simulated by the finite-difference time-domain (FDTD) method. The total scattering data of the cluster was processed as a bulk scattering parameter and imported to the Monte-Carlo ray-tracing (RT) method to realize a large-scale multi-particle scattering calculation. A polynomial mathematical model was built according to the multi-particle scattering data. An experiment was carried out for verifying the accuracy of the method in this work. The mean absolute percentages of the previous method are 1.68, 2.06, and 1.22 times larger than the multi-particle method compared with the experimental curves, respectively.

scholarly journals Hybrid Ray-Tracing/FDTD Method for Human Exposure Evaluation of a Massive MIMO Technology in an Industrial Indoor Environment

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 21020-21031 ◽  
Author(s):  
Sergei Shikhantsov ◽  
Arno Thielens ◽  
Gunter Vermeeren ◽  
Emmeric Tanghe ◽  
Piet Demeester ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Massive Mimo ◽  
Human Exposure ◽  
Indoor Environment ◽  
Fdtd Method ◽  
Exposure Evaluation ◽  
Mimo Technology

scholarly journals Acoustic ray tracing in the atmosphere: with gravitational effect and attenuation considered

2014 ◽  
Vol 57 (5) ◽  
Author(s):  
Yang Song ◽  
Yuannong Zhang ◽  
Chen Zhou ◽  
Zhengyu Zhao
Keyword(s):  
Dispersion Relation ◽  
Ray Tracing ◽  
Attenuation Coefficient ◽  
Acoustic Waves ◽  
Fdtd Method ◽  
Gravitational Effect ◽  
Buoyancy Frequency ◽  
Attenuation Effect ◽  
Leading Role ◽  
Ray Tracing Model

<p>An acoustic ray tracing model is developed to take into account the impacts of gravitational field and realistic atmospheric attenuation. Ray tracing equations are deduced from the real part of the dissipative dispersion relation, while the acoustic attenuation coefficient and growth rate in a stratified moving atmosphere are deduced from the imaginary part of the dispersion relation. To account for the non-isothermal effect and realistic attenuation, the buoyancy frequency and the cut-off frequency are substituted by the values in the slowly varying atmosphere, and the attenuation coefficient is corrected by the realistic absorption. In the validation by numerical experiment, the ray trajectory obtained by this ray tracing model agrees well with the result calculated by the FDTD method. It is shown that the acoustic trajectory can be accurately predicted by this ray tracing model. The numerical results for 5 Hz acoustic waves show that in the stratospheric ducting the gravitational effect plays a leading role while the attenuation effect could be neglected. But for the thermospheric ducting, the contribution of the absorption becomes more important.</p>

A Simulation Study of Lightning Surge Characteristics of a Distribution Line Using the FDTD Method

2009 ◽  
Vol 129 (10) ◽  
pp. 1225-1232 ◽  
Author(s):  
Susumu Matsuura ◽  
Akiyoshi Tatematsu ◽  
Taku Noda ◽  
Shigeru Yokoyama
Keyword(s):  
Simulation Study ◽  
Fdtd Method ◽  
Distribution Line

Design of Highly Efficient and Compact RF-DC Conversion Circuit at mW-class by LE-FDTD Method

2010 ◽  
Vol E93-C (8) ◽  
pp. 1323-1332 ◽  
Author(s):  
Tsunayuki YAMAMOTO ◽  
Kazuhiro FUJIMORI ◽  
Minoru SANAGI ◽  
Shigeji NOGI
Keyword(s):  
Fdtd Method ◽  
Highly Efficient
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