Evaluation of Visibility Sensors at the Eglin Air Force Base Climatic Chamber.
Final rept. Feb-Dec 82,
TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MA
Pagination or Media Count:
Three transmissometers and five forward-scatter meters were evaluated for measuring fog, haze, rain, and snow in the large test chamber of the Eglin Air Force Base Climatic Laboratory. Methods were developed for generating moderately uniform and stable fog and haze conditions. Fog densities equivalent to Runway Visual Range RVR values of 100 to 600 feet were achieved such fog densities are rare in nature and were the primary reason for undertaking the chamber tests. No unusual characteristics of the chamber fogs were noted. Laser transmissometers with 40- and 250 foot baselines served as standard sensors for the tests. Because of inhomogeneities in the chamber, only the 40-foot baseline gave good correlations with most of the test sensors. Consequently, one of the forward-scatter meters, the EGG 207, was used as a secondary standard for high visibility RVR above 1000 feet conditions. With appropriate corrections, all the test sensors met the 15 percent root-mean-square error pass-fail criterion for measuring dense fog. Author