C. E. Scarborough, T. P. Sheahen, measurements in NBS photometric range (unpublished data).
lowtran 5 was modified to allow the concentration of the “uniformly mixed gases” to increase in the ratio of ×/330, with × an input parameter. This minor fix was sufficient because CO2 was the only one of those gases with an absorption band within the instrument bandpass.
The chopper is a reflecting aluminum disk <3 cm from the detector. The remainder of the detector’s field of view is at 77 K. Although the chopper radiates at ambient temperatures (say 293 K) with an emittance between 0.05 and 0.1, the tail of the Planck function in the 4–5-μm wavelength range makes it act like a blackbody radiator near 240 K.
R. M. Goody, Atmospheric Radiation (Oxford U.P., London, 1964).
D. E. Gray, Ed., American Institute of Physics Handbook, (McGraw-Hill, New York, 1963).
W. L. Wolfe, G. J. Zissis, Eds., The Infrared Handbook, (Environmental Research Institute of Michigan, Ann Arbor, 1978).
F. X. Kneizys et al., “Atmospheric Transmittance/Radiance: Computer Code lowtran 5,” AFGL-TR-80-0067, Air Force Geophysics Laboratory (1980); available from National Technical Information Service, Washington, D.C.
A. J. LaRocca, R. E. Turner, “Atmospheric Transmittance and Radiance: Methods of Calculation,” Report 107600-10-T, Environmental Research Institute of Michigan. J. N. Hamilton, J. A. Rowe, D. Anding, “Atmospheric Transmission and Emission Program,” Report TOR-0073 (3050-02)-3 (Aerospace Corp., El Segundo, Calif., 1973).
For example, see A. T. Mecherikunnel, J. C. Richmond, “Spectral Distribution of Solar Radiation,” NASA Tech. Memo. 82021 (Sept.1980). Available from U.S. Superintendent of Documents, Washington, D.C.
Visions in Infrared (film) (AGA Corp., Lidingo, Sweden, 1975).
D. M. Burch, “Use of Aerial Infrared Thermography to Compare the Thermal Resistances of Roofs,” Natl. Bur. Stand. U.S. Tech. Note 1107 (Aug.1979); available from U.S. Superintendent of Documents, Washington, D.C.
AGA 680, manufactured by AGA Corp., Lidingo, Sweden. The reader should be aware that the National Bureau of Standards does not endorse one instrument manufacturer over another, and the choice of AGA for this study should not be construed as such.
Electro-Optical Industries model SS143 with Temperature Controller model 205.
AGA Thermovision 680/102B Operating Manual (AGA Corp., Lidingo, Sweden); supplemented by private communications.