Accession Number : AD0654417

Title :   PHOTOGRAPHIC PRODUCTION OF VARIABLE LIGHT TRANSMISSION MASKS,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Dell,A. H.

Report Date : MAR 1960

Pagination or Media Count : 18

Abstract : The problem is here solved of modulating a light beam as a one-dimensional function of position on a photographic film mask. This is accomplished by careful determination of the density-exposure behaviour of the film and development of a technique to control the film gamma; and a method of producing the correct film exposure to produce the desired exposure variation. While the problem here was to produce five half-sine waves it can easily be extended to include reasonably arbitrary variations of light transmission. (Author)

Descriptors :   (*LIGHT, MODULATION), (*PHOTOGRAPHY, ANALOG SYSTEMS), PHOTOGRAPHIC FILM, MASKING, LIGHT TRANSMISSION, CAMERAS, PHOTOGRAPHIC EQUIPMENT

Subject Categories : Photography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE