## Abstract

Using a digital camera and linearly polarizing film, we have developed a method for observing neutral point locations in the natural light field of the atmosphere. Utilizing this method, we have observed neutral points in the upwelling light field above a water surface. We report the location of these neutral points and compare them to Monte Carlo simulations.

© 2012 Optical Society of America

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### Equations (3)

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(1)
$$\overline{I}=\left[\begin{array}{c}I\\ Q\\ U\\ V\end{array}\right]\mathrm{.}$$
(2)
$${P}_{\text{linear}}=\frac{\sqrt{{Q}^{2}+{U}^{2}}}{I}\mathrm{.}$$
(3)
$$I={I}_{0\xb0}+{I}_{90\xb0},\phantom{\rule[-0.0ex]{2.0em}{0.0ex}}\phantom{\rule{0ex}{0ex}}Q={I}_{0\xb0}-{I}_{90\xb0},\phantom{\rule[-0.0ex]{2.0em}{0.0ex}}\phantom{\rule{0ex}{0ex}}U=2{I}_{45\xb0}-{I}_{0\xb0}-{I}_{90\xb0}\mathrm{.}$$