Abstract

The pressure-modulated near-infrared emission spectrum of a gas consists of a set of vibration-rotation bands. The intensity of the emitted radiation is a rapidly varying function of frequency. The transmission of this radiation through various gas samples has been investigated for absorbing atomspheric gases such as carbon dioxide, carbon monoxide, nitrous oxide, and methane; the effects of pressure-broadening of spectral lines by inert gases such as argon and nitrogen have been considered. The transmittance of radiant power has been shown to depend on the composition of the emitting sample and the compression ratio employed as well as on the composition of the absorbing sample. Possible application of pressure-modulation techniques to atmospheric transmission studies is suggested.

© 1962 Optical Society of America

Infrared Emission from a Pressure-Modulated Gas*

Richard R. Patty and Dudley Williams
J. Opt. Soc. Am. 52(5) 543-545 (1962)

Absorption Line Broadening in the Infrared

Darrell E. Burch, Edgar B. Singleton, and Dudley Williams
Appl. Opt. 1(3) 359-363 (1962)

Pressure Modulation of Infrared Absorption.* I. Entire Vibration-Rotation Bands

James C. Gilfert and Dudley Williams
J. Opt. Soc. Am. 48(11) 765-769 (1958)

Study of the Total Absorption near 4.7 μ by Two Samples of CO as their Total Pressures and CO Concentrations were Independently Varied*

David A. Gryvnak and John H. Shaw
J. Opt. Soc. Am. 52(5) 539-542 (1962)

Total Absorptance of Carbon Monoxide and Methane in the Infrared

Darrell E. Burch and Dudley Williams
Appl. Opt. 1(5) 587-594 (1962)