An Abridged Goniophotometer for Evaluating Projection Screens and other Diffusing Materials

A complete photometric description of the angular distribution of light reflected or transmitted by any material is given by a goniophotometric curve or curves in which luminance is plotted as a function of reflection or transmission spread angle. However, the determination of these data can be a complicated operation. — To allow more rapid and easy evaluation of front-projection screen materials, a simplified abridged version of a goniophotometer has been developed. This instrument compares material at certain preselected significant reflection angles. It has been found to be useful for quickly evaluating almost any sort of diffusing material. In order to make the instrument more versatile, a transmittance attachment has also been designed to permit similar evaluations for transmitting samples. The complete instrument is described and several examples of its use are shown.

Print ISSN

0361-4573

Published

1969-08

Content type

Original Research

DOI

10.5594/J10842