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MEASUREMENTS OF ATMOSPHERIC ATTENUATION
PERFORMANCE VALIDATION OF THE NBS TRANSMISSOMETER
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0peration 500 foot baseline Aids Experiment Station aircraft Allard's law angle applicable approach light Arcata At/t atmosphere average Aviation background luminance backscatter beam candelas per square ceiling ceilometer cloud base cloud height computed contrast threshold decision height determined distance edge lights effects equation extinction coefficient factor feet field of view fog density foot baseline transmissometer footcandle footlambert horizontal illuminance threshold indicated visibility installed intensity lamp Landing Aids Experiment length light source located luminous flux luminous intensity meteorological visibility Middleton mile candles minimum Nantucket Island NBS transmissometer nighttime observations obtained operational photoelectric photometric phototube pilot projector pulse rate relative error reported runway edge lights runway lights runway visual range scattered light error scattering coefficient Section sensitivity shown in figure signal term tests touchdown zone transmissivity transmissometer baseline transmissometer reading transmittance measurements twilight unit visibility calibration curve Washington National Airport Weather Bureau