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Development of Minimum Luminance Requirements for Underground Coal Mining Tasks.
NTIS: PB/230-477 Available for Reference At Bureau Libraries :275 pages
The objective of this program was to determine the minimum luminance requirements for underground coal mining work from the working face to the first transfer point. The measurements necessary to produce usable data involved two distinct phases, the first being in-mine measurements. The second phase of measurements were made in a full- scale simulated mine work space with full-scale machinery models. The threshold visibility luminances were revised upward to encompass a 99-percent probability of detecting a dynamic visual task of varying location and further upward to encompass 95 percent of a 55- to 65-year-old population. Extensive reflectance measurements were made of coal surfaces, roof shales, and floor materials. The results will be useful in designing future luminaries and illumination systems.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/230-477; Available for Reference At Bureau Libraries