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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- Winter '18
- Light, Wavelength, Electromagnetic spectrum, Visible spectrum, Infrared