Accession Number : AD0648611

Title :   EFFECT OF BACKSCATTER FROM AIRCRAFT BEACON LIGHTS ON TARGET VISIBILITY IN FOG.

Descriptive Note : Final rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY INST OF TRANSPORTATION AND TRAFFIC ENGINEERING

Personal Author(s) : Finch,D. M. ; Curwen,E. C. ; King,L. E.

Report Date : NOV 1966

Pagination or Media Count : 42

Abstract : Tests were performed in the fog chamber to determine how the backscatter from aircraft beacon lights (collision-avoidance lights) in a fog of 0.21 per mile transmittance affects an observer's ability to see a set of target lights at a fixed distance equal to the corresponding visual range of 3 miles (approximately 16,000 ft). The tests investigated three white and three red beacon lights, both steady-burning and flashing, with peak intensities from 1200 to 200,000 cp in white and 1200 to 25,000 cp in red. Results from a total of over 10,000 observations, made by 34 observers, show that use of the beacon lights produced no appreciable reduction in target-light visibility except with the highest white-light intensity. There was no apparent difference between the steady-burning and flashing modes of the beacons insofar as target visibility is concerned. (Author)

Descriptors :   (*TARGETS, VISIBILITY), (*BEACON LIGHTS, BACKSCATTERING), (*AIRCRAFT, BEACON LIGHTS), (*FOG, VISIBILITY), PILOTS, VISUAL PERCEPTION, ALL WEATHER AVIATION, HUMAN FACTORS ENGINEERING

Subject Categories : Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE