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dc.contributor.authorZhou, Huaichun
dc.contributor.authorHuang, Zhifeng
dc.contributor.authorCheng, Qiang
dc.contributor.authorLü, Wei
dc.contributor.authorQiu, Kui
dc.contributor.authorChen, Chen
dc.contributor.authorHsu, Peifeng
dc.date.accessioned2014-11-18T16:33:12Z
dc.date.available2014-11-18T16:33:12Z
dc.date.issued2011-04-20
dc.identifier.citationZhou, H., Huang, Z., Cheng, Q., Lü, W., Qiu, K., Chen, C. & Hsu, P. (2011) Road surface mirage: a bunch of hot air? Chinese Science Bulletin, 56(10), 962.en_US
dc.identifier.urihttp://hdl.handle.net/11141/423
dc.description.abstractThe inferior mirage from road surfaces is a common phenomenon, which can be easily seen in everyday life. It has been recognized in the literature as a light refraction phenomenon due to the refractive index gradient caused by the temperature gradient in the air strata above the road surfaces. However, it was also suggested that the mirage is just a phenomenon of specular reflection at grazing incidence. Because of the lack of reasonable and quantitative evidence, the generally accepted light refraction theory has not yet been refuted. Here we show some mirror-like reflection images captured from a road surface stretch in Yujiashan North Road, Wuhan, China, when there was no obvious temperature gradient on or above the road, measured on a winter day in December 2009. This provided direct evidence to doubt the temperature induced light refraction mechanism of the inferior mirage. Furthermore, the critical grazing angle of about 0.2° to the road plane where the mirror-like reflection appears could not make the rough surface scatter incident light as a smooth surface according to the Rayleigh criterion. Therefore the phenomenon is a mirrorlike observation effect of scattering from the surface, which cannot be entirely explained by light refraction via air strata. The results demonstrate that the image-formation mechanism and the observer-based-analysis method shown here potentially offer a means of understanding a wide range of scattering phenomena from rough surfaces at grazing angle; for example, the superior mirages of unusual brightness occasionally observed over frozen lakes and the off-specular reflection phenomenon.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is available in accordance with the publisher's policy. It may be subject to U.S. Copyright Law.en_US
dc.rights.urihttp://www.springeropen.com/abouten_US
dc.titleRoad surface mirage: A bunch of hot air?en_US
dc.typeArticleen_US
dc.identifier.doi10.1007/s11434-011-4347-9


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