Abstract

The carbon arc furnishes the brightest source of infrared readily obtainable, but the interfering absorption spectra of atmospheric CO₂ and H₂O are difficult to avoid when using it. An infrared source is described consisting of a tungsten ribbon formed in the shape of a cavity, and heated electrically to 2900°K, in an inert atmosphere. The power required is 390 watts. Such a source furnishes a signal two to four times that of the conventional Globar over the rocksalt spectral region. While only about half as bright as the carbon arc, it can be used with an optical path free of atmospheric absorption.

© 1951 Optical Society of America

A Fast-Scanning Infrared Recording Spectrometer*

P. J. Wheatley, E. R. Vincent, D. L. Rotenberg, and G. R. Cowan
J. Opt. Soc. Am. 41(10) 665-672 (1951)

Thermal Conductivities of Tungsten and Molybdenum at Incandescent Temperatures

Robert H. Osborn
J. Opt. Soc. Am. 31(6) 428-432 (1941)

Reflection and Transmission Infrared Cells for Use at Liquid Air Temperatures

L. F. H. Bovey
J. Opt. Soc. Am. 41(6) 381-384 (1951)

Spectroscopy in Infrared by Reflection and Its Use for Highly Absorbing Substances*

Ivan Šimon
J. Opt. Soc. Am. 41(5) 336-345 (1951)

Deviation from Lambert’s Law and Polarization of Light Emitted by Incandescent Tungsten, Tantalum and Molybdenum and Changes in the Optical Constants of Tungsten with Temperature*

A. G. Worthing
J. Opt. Soc. Am. 13(6) 635-649 (1926)