Abstract

A type of visible-absorbing, infra-red transmitting filter is described in which the absorbing units are produced from a plastic film that also serves as a supporting medium. Filters of this kind prepared from polyvinyl chloride and polyvinylidene chloride films are characterized by transmission bands between 1 and 3.3μ and between 3.5 and 5.8μ. Ways of isolating either of these bands are described. Such filters have obvious utility in connection with photoconductive cells.

© 1950 Optical Society of America

Infra-Red Microspectroscopy*

Elkan R. Blout, George R. Bird, and David S. Grey
J. Opt. Soc. Am. 40(5) 304-313 (1950)

Recent Investigations in the Far Infra-Red

T. King McCubbin and William M. Sinton
J. Opt. Soc. Am. 40(8) 537-539 (1950)

The Combined Effect of Infra-Red Radiation and Intensification upon the Photographic Latent Image*

L. Fortmiller, T. H. James, R. F. Quirk, and W. Vanselow
J. Opt. Soc. Am. 40(8) 487-496 (1950)

A Variable Thickness Low Temperature Infra-Red CeH*,†

Robert B. Holden, William J. Taylor, and Herrick L. Johnston
J. Opt. Soc. Am. 40(11) 757-760 (1950)

Plastic Filters for the Visible and Near Infra-Red Regions*†

John H. Shenk, Edwin S. Hodge, Robert J. Morris, Edward E. Pickett, and Wallace R. Brode
J. Opt. Soc. Am. 36(10) 569-575 (1946)