Solar Infrared Photometer
J. D. SPINHIRNE, M. G. STRANGE AND L. R. BLAINE
NASA/Goddard Space Flight Center, Greenbelt, MD 20771
26 June 1984 and 26 December 1984
ABSTRACT
A sun photometer which operates at five wavelengths in the near infrared between 1.0 and 4.0 Ani has
been developed. The instrument is a manually operated, filter wheel design and has principal applications
for atmospheric aerosol studies. The wavelength filters were selected at bands with minimal gaseous absorption.
A modified Langley analysis which accounts for residual gaseous absorption is employed
for
the instrument
calibration. Calibration and stability results for the instrument are presented.
1. Introduction
Sun photometry is a standard technique for mea-
suring transmission through the atmosphere. The
observation of spectral turbidity has basic applications
for studies of the magnitude and influence of partic-
ulate loading in the atmosphere. Most current sun
photometer instruments are based on silicon or ger-
manium photodiode detectors and operate at wave-
lengths less than 1.1 Am for silicon or 1.7 gm for
germanium detectors (Shaw, 1983; Volz, 1974). How-
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