Accession Number : AD0644986

Title :   A PRELIMINARY REPORT ON ABSOLUTE SKY RADIANCE MEASUREMENTS IN THE REGION OF 1.5 TO 3.2 MICRONS.

Descriptive Note : Research communication no. 15,

Corporate Author : DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LAB

Personal Author(s) : Hall,Freeman F.

Report Date : JUL 1966

Pagination or Media Count : 20

Abstract : An investigation to measure the absolute radiance distribution of the night sky in the spectral region from 1.5 to 3.2 microns is described, together with the instrumentation designed for the study. A 61-cm aperture Newtonian radiometer with an f/2 cast aluminum mirror directed radiation to a 30-element PbS linear array. Individual solid state amplifiers were used for each detector, and total field chopping with electronic zero suppression provided detection for both point and diffuse sources. Each detector subtended a field of view of 1 x 1 minute of arc. Atmospheric and instrumental fluctuations usually limited minimum detectable radiance. Measurements of the Crab Nebula confirm radiance values previously published by Moroz. Results of scans across other known diffuse sources are also reported. Several bright infrared stars were found which do not correspond in position to known late stars. (Author)

Descriptors :   (*NIGHT SKY, *SKY BRIGHTNESS), INFRARED SPECTROSCOPY, RADIOMETERS, STARS

Subject Categories : Astrophysics
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE