نتایج جستجو برای: skylight

تعداد نتایج: 341  

2015
Tao Ma Xiaoping Hu Lilian Zhang Junxiang Lian Xiaofeng He Yujie Wang Zhiwen Xian

Skylight polarization provides a significant navigation cue for certain polarization-sensitive animals. However, the precision of the angle of polarization (AOP) of skylight for vehicle orientation is not clear. An evaluation of AOP must be performed before it is utilized. This paper reports an evaluation of AOP of skylight by measuring the skylight polarization patterns of clear and cloudy ski...

2013
Xianou Li Frederick Wong Yihan Li

This paper presents a methodology for optimizing skylight design with the considerations of thermal comfort, daylight availability and energy performance by integrated daylight and thermal simulation. Dynamic thermal modelling programmed IES and daylight simulation engine Radiance are used as simulation tools to study energy performance of a shopping mall atrium with a skylight on the roof ...

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Skylights or light wells are an integral part of the design of low- and high-depth buildings. The design of these skylights in different areas is based on specific criteria. According to Hamedan's criteria, only the dimensions of these skylights and the ratio of skylight area to height of the skylight are enough to design skylights. The purpose of this study was to evaluate the accuracy of sk...

2009
Yan Cui Jinkui Chu Nannan Cao Kaichun Zhao

A new system has been developed and calibrated to measure the charactristics and distribution of skylight polarization. With a series of measurements obtained, we verified that the distribution of degree and angle of skylight polarization accords well with the predictions of Rayleigh scattering. The differences of the characteristics and distribution of skylight polarization across the principa...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2006
Rüdiger Wehner Martin Müller

As textbook knowledge has it, bees and ants use polarized skylight as a backup cue whenever the main compass cue, the sun, is obscured by clouds. Here we show, by employing a unique experimental paradigm, that the celestial compass system of desert ants, Cataglyphis, relies predominantly on polarized skylight. If ants experience only parts of the polarization pattern during training but the ful...

2017
Huijie Zhao Bolun Cui Guorui Jia Xudong Li Chao Zhang Xinyang Zhang

Even though digital simulation technology has been widely used in the last two decades, hardware-in-the-loop (HWIL) simulation is still an indispensable method for spectral uncertainty research of ground targets. However, previous facilities mainly focus on the simulation of panchromatic imaging. Therefore, neither the spectral nor the spatial performance is enough for hyperspectral simulation....

Journal: :Applied optics 2012
Tristan Harmel Alexander Gilerson Alberto Tonizzo Jacek Chowdhary Alan Weidemann Robert Arnone Sam Ahmed

Above-water measurements of water-leaving radiance are widely used for water-quality monitoring and ocean-color satellite data validation. Reflected skylight in above-water radiometry needs to be accurately estimated prior to derivation of water-leaving radiance. Up-to-date methods to estimate reflection of diffuse skylight on rough sea surfaces are based on radiative transfer simulations and s...

Journal: :Applied optics 2008
Miguel A López-Alvarez Javier Hernández-Andrés Javier Romero F J Olmo A Cazorla L Alados-Arboledas

In a previous work [J. Opt. Soc. Am. A 24, 942-956 (2007)] we showed how to design an optimum multispectral system aimed at spectral recovery of skylight. Since high-resolution multispectral images of skylight could be interesting for many scientific disciplines, here we also propose a nonoptimum but much cheaper and faster approach to achieve this goal by using a trichromatic RGB charge-couple...

2008
Ralf Habel Bogdan Mustata Michael Wimmer

We present a fast and compact representation of a skylight model for spherical harmonics lighting, especially for outdoor scenes. This representation allows dynamically changing the sun position and weather conditions on a per frame basis. We chose the most used model in real-time graphics, the Preetham skylight model, because it can deliver both realistic colors and dynamic range and its exten...

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