Investigation of the Imaging and Luminance Characteristics Associated with Point Light Projection

摘要

Because of practical geometric limitations imposed on point light projection and the wide field of view achieved, certain requirements on projection screen contour exist.These requirements stem from imaging distortions and errors and illumination deficiencies, some of which are inherent and others introduced by improper screen design. In the paper the prominent imaging errors are derived and catalogued for several screen contours, in addition to luminance characteristics. It is found that suitable precautions can negate most of the imaging errors but the screen luminance characteristics are controlled l the Fresnel reflection losses at the transparency. A suitable balance between illumination, imaging errors and construction ease for initial research programs resulted in choice of a surface whose cross section is a catenary. (Author)