Accession Number : AD0837609

Title :   COLLIMATED LIGHT SOURCE STUDY.

Descriptive Note : Final rept. 4 Jun-25 Dec 67,

Corporate Author : CONDUCTRON CORP ANN ARBOR MI

Personal Author(s) : Ansley, D. A. ; Cykowski, C. M.

Report Date : JUL 1968

Pagination or Media Count : 97

Abstract : Techniques to enhance the viewing of aerial reconnaissance film by modification of the illumination section of existing microscopes were theoretically and experimentally investigated. Theoretically, a technique was described for predicting the transfer function of an optical system as a function of illumination. It was shown that the spatial frequency content of the imagery being viewed, as well as the human eye response, play a role in determining the optimum transfer function. Two stereo microscopes commonly used for photointerpretation, a Bausch and Lomb Zoom 70 and a Wild-5, were used in the study. The course of action chosen to investigate the problem was to measure the square wave response (SWR) of the microscopes using several types of illumination. Curves of output modulation (contrast) versus spatial frequency in the object plane were constructed for each particular configuration and compared with each other. The types of illumination tested included diffuse white light, coherent laser illumination, oblique illumination, collimated white light, diverging white light and illumination through a honeycomb element. (Author)

Descriptors :   (*RECONNAISSANCE FILM, IMAGE INTENSIFIERS(ELECTRONICS)), ILLUMINATION, MICROSCOPY, PHOTOINTERPRETATION, RESOLUTION, MODIFICATION KITS, STEREOSCOPES, PHOTOGRAPHIC CONTRAST, SCATTERING, COHERENT RADIATION, AERIAL PHOTOGRAPHY, TEST METHODS, TEST EQUIPMENT.

Subject Categories : Cartography and Aerial Photography
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE