Accession Number : AD0716483

Title :   Visibility Measurement for Aircraft Landing Operations.

Descriptive Note : Final rept. 26 Sep 69-30 Sep 70,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Collis,Ronald T. H. ; Viezee,William ; Uthe,Edward E. ; Oblanas,John

Report Date : 30 SEP 1970

Pagination or Media Count : 148

Abstract : An experimental pulsed neodymium lidar system was modified and calibrated to obtain accurate data on atmospheric extinction properties in fog and low cloud conditions. The objective was to establish the theoretical and practical basis of a system for measuring slant visibility conditions for aircraft landing operations. To operate in conditions of fog and low cloud the lidar system's dynamic range was extended to 50 dB by using a two-stage receiver system. In addition, the transmitter and receiver beams were made coaxial to make close-range observations. (Author)

Descriptors :   (*ATMOSPHERES, VISIBILITY), (*VISIBILITY, *AIRCRAFT LANDINGS), OPTICAL RADAR, FOG, BACKSCATTERING, OPTICAL PROPERTIES, DETECTION, NEODYMIUM, RADAR REFLECTORS, MONITORS, ATTENUATION, TRANSMITTER RECEIVERS, SENSITIVITY, CEILING, CALIFORNIA

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE