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首页> 美国政府科技报告 >Linear Polarization of Light by Two Wheat Canopies Measured at Many View Angles
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Linear Polarization of Light by Two Wheat Canopies Measured at Many View Angles

机译：两个小麦冠层在许多视角下测量的光线偏振

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The linear polarization and reflection of visible light by wheat as a function of sun-view diections, crop development stage, and wavelength were examined. Two-hundred spectra were taken continuously in wave-lengths from 0.45 to 0.72 Micron in 33 view directions using an Exotech model 20C spectroradiometer six meters above two wheat canopies in the boot and fully headed maturity stages. The analysis results show that the amount of linearly polarized light from the wheat canopies is greatest in the blue spectral region and decreases gradually with increasing wavelength. The results also show that the linearly polarized light from the canopies is generally greatest in the azimuth direction of the Sun and tends toward zero as the view direction tends toward the direction of the hot spot or anti-solar point. It is demonstrated that the single, angle of incidence of sunlight on the leaf, explains almost all of the variation of the amount of polarized light with Sun-view direction.

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