The structure of light beams reflected by plant leaves

Rvachev, V. P.; Guminetskii, S. G.

doi:10.1007/bf00613254

Cited by 41 publications

(6 citation statements)

References 1 publication

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“…The structure of light beams reflected from plant leaves has also been studied (17). The structure of light beams reflected from plant leaves has also been studied (17).…”

mentioning

confidence: 99%

Physical rehabilitation has a positive effect on disability in multiple sclerosis patients

Solari¹,

Filippini²,

Gasco³

et al. 1999

Neurology

213

100

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“…The structure of light beams reflected from plant leaves has also been studied (17). The structure of light beams reflected from plant leaves has also been studied (17).…”

mentioning

confidence: 99%

Physical rehabilitation has a positive effect on disability in multiple sclerosis patients

Solari¹,

Filippini²,

Gasco³

et al. 1999

Neurology

213

100

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show abstract

“…Reflectance at 680 and 1950 nm is relatively unchanged by infiltrations, however, so most of it must originate from the 'This study was Agricultural Research Service, United States Department of cuticle or surface of the leaf. The structure of light beams reflected from plant leaves has also been studied (17).…”

mentioning

confidence: 99%

Optical Parameters of Leaves of 30 Plant Species

Gausman¹,

Allen²

1973

Plant Physiol.

194

106

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“…Small particles and features on the leaf surface scatter light away from the specular direction. The polarized reflectance equals the specular reflectance when the angles of incidence and reflectance both equal Brewster's angle, approximately 55°from the normal vector of the wax-coated leaf surface [22].…”

Section: Discussionmentioning

confidence: 98%

Imaging polarimetry of forest canopies: how the azimuth direction of the sun, occluded by vegetation, can be assessed from the polarization pattern of the sunlit foliage

et al. 2007

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Radiance, color, and polarization of the light in forests combine to create complex optical patterns. Earlier sporadic polarimetric studies in forests were limited by the narrow fields of view of the polarimeters used in such studies. Since polarization patterns in the entire upper hemisphere of the visual environment of forests could be important for forest-inhabiting animals that make use of linearly polarized light for orientation, we measured 180 degrees field-of-view polarization distributions in Finnish forests. From a hot air balloon we also measured the polarization patterns of Hungarian grasslands lit by the rising sun. We found that the pattern of the angle of polarization alpha of sunlit grasslands and sunlit tree canopies was qualitatively the same as that of the sky. We show here that contrary to an earlier assumption, the alpha-pattern characteristic of the sky always remains visible underneath overhead vegetation, independently of the solar elevation and the sky conditions (clear or partly cloudy with visible sun's disc), provided the foliage is sunlit and not only when large patches of the clear sky are visible through the vegetation. Since the mirror symmetry axis of the alpha-pattern of the sunlit foliage is the solar-antisolar meridian, the azimuth direction of the sun, occluded by vegetation, can be assessed in forests from this polarization pattern. Possible consequences of this robust polarization feature of the optical environment in forests are briefly discussed with regard to polarization-based animal navigation.

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The structure of light beams reflected by plant leaves

Cited by 41 publications

References 1 publication

Physical rehabilitation has a positive effect on disability in multiple sclerosis patients

Physical rehabilitation has a positive effect on disability in multiple sclerosis patients

Optical Parameters of Leaves of 30 Plant Species

Imaging polarimetry of forest canopies: how the azimuth direction of the sun, occluded by vegetation, can be assessed from the polarization pattern of the sunlit foliage

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