Abstract

Methods have been explored for magnifying the crater of a water-cooled 100-watt zirconium arc infrared source to fill the approximately 6-mm slit height accommodated by the Perkin-Elmer microscope attachment for the Model 112 infrared spectrometer. Two optical systems were used: a large Schwarzschild mirror system similar to that used as a condenser in the microscope attachment and a combination of a f/1 sphere and a flat with a hole in its center. These systems gave a considerable increase in energy over that of the globar operated at 200 watts: approximately 2.25:1 at 14 microns, 4:1 at 4 microns, and much higher factors at shorter wavelengths. The factor of 2.25 at 14 microns where Rayleigh-Jeans formula should be valid is approximately what would be predicted from the relative temperatures of the zirconium arc and the globar. The magnified zirconium arc is not as intense as a carbon arc. From the standpoint of convenience, the zirconium arc is superior to the carbon arc in that it requires no changing of electrodes and gives a compact, totally enclosed source with a short air path which can easily be flushed free of atmospheric gases which absorb in the infrared.

© 1956 Optical Society of America

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