Accession Number : AD0722537

Title :   Some Properties of Flashes Produced by a Scintillating Xenon Arc Flash Tube.

Descriptive Note : Final rept.,

Corporate Author : ROCHESTER UNIV N Y INST OF OPTICS

Personal Author(s) : Bates,Robert

Report Date : 22 MAR 1971

Pagination or Media Count : 79

Abstract : For an effective flash burst length fixed at 0.3 seconds the contrast threshold (C degrees) is examined at seven retinal locations (0 degrees to 12 degrees) at eight background luminances. From this data a background luminance is chosen where C degrees is uniform across the retina (Blackwell, 1958). This value is called B prime. At B prime the contrast threshold is again examined, but at a burst length of 0.01 seconds and for a single pulse of 40 micro sec. This examination is accomplished at 0 degrees and 9 degrees retinal locations. An evaluation of the Blondel-Rey constant at B prime is made to compare with the value of 0.2 presently used for marine signals to determine its relevance for xenon arc signals. The data for very short flashes is examined at 0 degrees and 9 degrees to determine any deviation from the uniform C degrees across the retina for the 0.3 second flash. These deviations are examined closely in order to determine any possible temporal advantage of the extremely short xenon pulse on conspicuity. (Author)

Descriptors :   (*XENON LAMPS, *NAVIGATIONAL AIDS), (*GAS DISCHARGES, VISUAL PERCEPTION), FLASH LAMPS, SCINTILLATION, LUMINESCENCE, INTENSITY, TEST EQUIPMENT, TEST METHODS, THESES

Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE