An analytical treatment is given which shows that the peak luminance gain and lobe width of a back or front projection screen material can be used as coordinates on a graph to determine the transmission or reflection efficiency. The analysis assumes that the angular distribution of the gain can be expressed as a power of a cosine function. Also, a screen photometer is described which is based upon the adaptation of a spectrometer to measure screens having retroreflective characteristics. The photometer is capable of measuring luminance on the retroreflective axis and out to 15° on either side of the incident beam. Screen samples, 2.54 cm sq, can be oriented through angles of ±30° to the incident beam and luminances from 1 ft-L to 10,000 ft-L (from about 3.5 cd/m2 to 35,000 cd/m2) can be handled. The instrument has three modes of operation: visual, photoelectric, and photographic. A graph is presented illustrating the application of the analytical technique to provide a rapid performance evaluation and comparison of screen efficiencies.
© 1970 Optical Society of America
Original Manuscript: January 13, 1970
Published: September 1, 1970
G. F. Marshall and M. H. Williams, "Retroreflective Photometry for Screen Efficiency Evaluation," Appl. Opt. 9, 2134-2139 (1970)
|Alert me when this paper is cited|
OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.