Abstract

In this paper we have presented a new method for determining optical opacity of atmosphere using imaging from a sinusoidal grating through it. In the experiment a sinusoidal grating with variable period is printed and pasted on a wooden frame. The frame is installed at   m away from an imagining system.  The imagining system consists a telescope and a CCD camera. The CCD is installed at the focal plane of the telescope. Image of the grating is recorded through the atmosphere and the telescope by the CCD.  Local visibility of the grating image is measured and cut-off frequency of the pattern is determined. From the cut-off frequency of the image pattern the optical opacity of atmosphere is determined.