occulting disk造句

• A lens focuses an image of the sun onto a masking or occulting disk that prevents the light from proceeding farther into the telescope.
• During a solar eclipse, the Moon acts as an occulting disk and any camera in the eclipse path may be operated as a coronagraph until the eclipse is over.
• Because of the happy coincidence of the moon's size and distance, when the moon passes directly between the sun and the earth, it is usually in just the right position to make a very effective occulting disk.
• All this is leading up to the Terrestrial Planet Finder, planned for 2015, whose goal is to detect distant planets directly, using an occulting disk or interference techniques to separate the planet's dim light from that of its much brighter parent star.
• Any sharp edge ( such as the edge of an occulting disk or optical aperture ) causes Fresnel diffraction of incoming light around the edge, which means that the smaller instruments that one would want on a satellite unavoidably leak more light than larger ones would.