By Hale G. E., Babcock H. D.
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Additional info for An Attempt to Measure the Free Electricity in the Suns Atmosphere
Several kinds are manufactured by The Eppley Laboratory, Inc. Newport, Rhode Island. Figure 5 shows a normal incidence pyrheliometer (with a solar tracker), which is used for measurement of direct solar irradiance (in watts per square meter). The instrument is mounted on a solar tracker to permit aiming the sensor directly at the sun throughout the day without manual attention. Filters may be mounted on the optical system when a particular spectral range is to be measured. The acceptance angle of the sensor system is 5j43V30U, which is about 10 times the sun is angular diameter.
Arizona 1964, 2, 193. ; Sagan, C. Interpretation of surface features. Presented at Symposium on the Surface of Mars, Goddard Institute for Space Studies, Feb. 3 and 4, 1967. Unpublished. Van Diggelen, L. Photometric properties of lunar cater ﬂoors. Recherche Astronomique de l’Observatoire d’Utrecht, 1959. S. Selected articles on light scattering and photometric relief of the lunar surface. Astron. Zh. 33(1), NASA TTF-75, 1962. G. Photometry and Polarization in Remote Sensing. New York: Elsevier Science, 1985.
The reason for the decrease in emissivity with increased angle of emission is that the directional transmittance of the glass/air surface decreases at the larger angles. Thus, tungsten incandescent ﬁlaments can be expected to produce some polarized radiation at all wavelengths depending on their physical structure. A convenient optical structure that serves to remedy this situation is the Lyot depolarizer. It is placed in the optical path between the tungsten lamp source and the object to be illuminated.