scholarly journals Optical Design of a Novel Two-Stage Dish Applied to Thermochemical Water/CO2 Splitting with the Concept of Rotary Secondary Mirror

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3553
Author(s):  
Song Yang ◽  
Jun Wang ◽  
Peter D. Lund
Keyword(s):  
Mathematical Model ◽  
Ray Tracing ◽  
Concentration Ratio ◽  
Thermal Water ◽  
Optical Design ◽  
Two Stage ◽  
Optical Efficiency ◽  
Primary Mirror ◽  
Secondary Mirror ◽  
Ray Tracing Simulation

In this paper, a novel two-stage dish concentrator (TSD) with a rotary secondary mirror (SM) is presented for solar thermal water/CO2 splitting. An in-house code for ray-tracing simulation of the concentrator was developed and validated. Among all feasible geometries, a hyperboloid with an upper sheet is the most popular option and is widely used as a secondary reflector, which is mainly discussed here. All para-hyperboloid geometric combinations can be categorized into three typical patterns (φ1 < π/2, φ1 = π/2, φ1 > π/2, φ1 = field angle of PM). The initial designs of the TSD, respective to different off-axis levels for each combination, were first designed. Then a new mathematical model was introduced to reshape the SM to reach optimal truncated designs. Finally, a new concept of an off-axis primary mirror (PM) combined with the truncated SM was evaluated by using the in-house ray-tracing code. The results include the optical efficiency, concentration ratio and intercepted radiant flux. The best solutions with the highest optical efficiency fall in the range π/2 ≤ φ1 ≤ (π − arcsin 0.8) rads and 0.4 ≤ NA2 ≤ 0.6 (NA2 = sin φ2, φ2 = field angle of SM), which vary with the concentration ratio and inclination angle.

VLC-LED Receiver Condenser with Optimized CPC

2014 ◽  
Vol 597 ◽  
pp. 480-483
Author(s):  
Zhao Xia Wu ◽  
You Jin Nie ◽  
Wei Jin ◽  
Zhi Xu Zhang ◽  
Qian Qiao ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ray Tracing ◽  
Signal Intensity ◽  
Concentration Ratio ◽  
Deviation Angle ◽  
Compound Parabolic Concentrator ◽  
Simulation Results ◽  
Ray Tracing Simulation

In order to enhance the signal intensity of VLC-LED receiver, this paper describes a receiver condenser which is designed based on optimized CPC (compound parabolic concentrator) by using a truncated method, for achieving the aim of boosting receiver’s ability of gathering light and enhancing signal intensity. The Monte Carlo-ray tracing simulation results shows that in the VLC-LED system, the optimized CPC condenser has those advantages, such as higher concentration ratio, larger concentrate light deviation angle.

Design of Secondary Optical Element for a Two-Reflector Solar Concentrator

2013 ◽  
Vol 479-480 ◽  
pp. 161-165 ◽  
Author(s):  
Yi Cheng Chen ◽  
Chia Chi You
Keyword(s):  
Ray Tracing ◽  
Optimum Design ◽  
Optical Element ◽  
Solar Concentrator ◽  
Optical Performance ◽  
Parabolic Mirror ◽  
Acceptance Angle ◽  
Optical Efficiency ◽  
Ray Tracing Simulation

This study explores the optimum design of secondary optical element (SOE) for a non-coplanar two-reflector solar concentrator. The non-coplanar solar concentrator comprises a primary parabolic mirror and a secondary hyperbolic mirror. Ray tracing simulation is adopted to investigate the optical performance, including the acceptance angle and the optical efficiency, of the solar concentrator with various designs of SOE. Finally, preliminary optimum designs of SOE are presented and discussed.

scholarly journals Investigating Intense Rainfall Influence on Distance Measurement with a Time-of-Flight Camera Sensor Using Optical Ray-Tracing Simulation Technique

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1056
Author(s):  
Marcus Baumgart ◽  
Norbert Druml ◽  
Markus Dielacher ◽  
Cristina Consani
Keyword(s):  
Ray Tracing ◽  
Time Of Flight ◽  
Autonomous Driving ◽  
Intense Rainfall ◽  
Signal Suppression ◽  
Tof Camera ◽  
Ray Tracing Simulation ◽  
Camera Sensors ◽  
Optical Ray Tracing ◽  
Rain Effect

Robust, fast and reliable examination of the surroundings is essential for further advancements in autonomous driving and robotics. Time-of-Flight (ToF) camera sensors are a key technology to measure surrounding objects and their distances on a pixel basis in real-time. Environmental effects, like rain in front of the sensor, can influence the distance accuracy of the sensor. Here we use an optical ray-tracing based procedure to examine the rain effect on the ToF image. Simulation results are presented for experimental rain droplet distributions, characteristic of intense rainfall at rates of 25 mm/h and 100 mm/h. The ray-tracing based simulation data and results serve as an input for developing and testing rain signal suppression strategies.

scholarly journals Optical Design of a Solar Dish Concentrator Based on Triangular Membrane Facets

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Hongcai Ma ◽  
Guang Jin ◽  
Xing Zhong ◽  
Kai Xu ◽  
Yanjie Li
Keyword(s):  
Focal Plane ◽  
Concentration Ratio ◽  
Collection Efficiency ◽  
Optical Design ◽  
Design Procedure ◽  
Diameter Ratio ◽  
Mean Square ◽  
Optical Performance ◽  
Space Antenna ◽  
Tracing Method

The design of a solar dish concentrator is proposed based on triangular membrane facets for space power applications. The facet concentrator approximates a parabolic surface supported by a deployable perimeter truss structure, which originates from a large aperture space antenna. For optimizing the number of facets rows and focal-diameter ratio of the concentrator, Monte Carlo ray-tracing method is utilized to determine optical performance of the concentrator, and the system root-mean-square (RMS) deviation is considered in this design procedure. A 600-facet concentrator with focal-diameter ratio of 1.1 will achieve 83.63% of radiative collection efficiency over a 15 cm radius disk located in the focal plane, with a mean solar concentration ratio exceeding 300. The study in this paper is helpful for the development of the membrane facet concentrator.

scholarly journals Simple and Exact Closed-Form Expression for Determination of a Penetrated Ray Path in a Ray Tracing

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hyun Wook Moon ◽  
Woojoong Kim ◽  
Sewoong Kwon ◽  
Jaeheung Kim ◽  
Young Joong Yoon
Keyword(s):  
Closed Form ◽  
Approximate Method ◽  
Ray Tracing ◽  
Conventional Method ◽  
Closed Form Expression ◽  
Indoor Environments ◽  
Straight Line ◽  
Ray Path ◽  
Ray Tracing Simulation

A simple and exact closed-form equation to determine a penetrated ray path in a ray tracing is proposed for an accurate channel prediction in indoor environments. Whereas the penetrated ray path in a conventional ray tracing is treated as a straight line without refraction, the proposed method is able to consider refraction through the wall in the penetrated ray path. Hence, it improves the accuracy in ray tracing simulation. To verify the validation of the proposed method, the simulated results of conventional method, approximate method, and proposed method are compared with the measured results. The comparison shows that the proposed method is in better agreement with the measured results than the conventional method and approximate method, especially in high frequency bands.

Optical design of two-stage zoom scanning infrared system with array detector

2020 ◽  
Vol 49 (8) ◽  
pp. 20200007-20200007
Author(s):  
丁学专 Xuezhuan Ding ◽  
周潘伟 Panwei Zhou ◽  
王世勇 Shiyong Wang ◽  
于洋 Yang Yu ◽  
李范鸣 Fanming Li
Keyword(s):  
Optical Design ◽  
Array Detector ◽  
Two Stage

Analysis of Multipath Propagation in Urban Environment Through Multidimensional Measurements and Advanced Ray Tracing Simulation

2008 ◽  
Vol 56 (3) ◽  
pp. 848-857 ◽  
Author(s):  
Franco Fuschini ◽  
Hassan El-Sallabi ◽  
Vittorio Degli-Esposti ◽  
Lasse Vuokko ◽  
Doriana Guiducci ◽  
...  
Keyword(s):  
Urban Environment ◽  
Ray Tracing ◽  
Multipath Propagation ◽  
Ray Tracing Simulation
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