Accession Number : AD0907549

Title :   Absorption Measurements of the 10.4 Micron Region Using a CO2 Laser and a Spectrophone.

Descriptive Note : Technical rept.,

Corporate Author : OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB

Personal Author(s) : Trusty, Gary L.

Report Date : JAN 1973

Pagination or Media Count : 89

Abstract : A spectrophone cell and a data acquisition system were developed and used to make low level absorption measurements of carbon dioxide and water vapor. A 1 watt per line carbon dioxide laser was used as the source. Measurements were made of the absorption of the P branch of the 10.4 micron band of CO2. Results of these measurements were used to calculate the self broadened and foreign broadened Lorentz half widths of the lines in that band as a function of the rotational quantum number. The gases used for foreign broadening were nitrogen, argon and helium. Absorption measurements of water vapor-nitrogen and mixtures were made in the 10.4 micron region. The absorption coefficient of the continuum in this region was found to have a positive slope with increasing wavenumber. Preliminary studies were done measuring the temperature dependence of the water vapor absorption coefficient at wavelengths corresponding to the P(20) and the P(32) lines of the CO2 laser. The temperature range covered was from 30 C to 55 C. A positive temperature coefficient of about 0.5% change/C was obtained. (Author)

Descriptors :   (*GAS LASERS, ABSORPTION SPECTRA), INFRARED LASERS, PROPAGATION, CARBON DIOXIDE, WATER VAPOR, NITROGEN, ATMOSPHERES, HEAT TRANSFER, TELESCOPES, TUNING DEVICES, PRESSURE, ALIGNMENT, INFRARED RADIATION.

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE