Optoacoustic spectral distribution in a low pressure methyl alcohol vapor

Author

Azar, Mary ; Fishback, Jerome R. ; Ventrice, Carl A.

Author_Institution

Dept. of Electr. Eng., Tennessee Technol. Univ., Cookeville, TN, USA

fYear

1989

fDate

9-12 Apr 1989

Firstpage

1030

Abstract

The spectral distribution of an optoacoustic signal, generated in a low-pressure methyl alcohol vapor, is investigated. Measurements are made at gas pressures ranging from 2-0.3 Torr and for chopper frequencies ranging from 100 to 2000 Hz. It is observed, at a given gas pressure, that nonharmonic spectral components appear in the distribution as the chopper frequency increases to the larger values. In addition, it is observed that a decrease in gas pressure, for a fixed chopper frequency, gives rise to nonlinear behavior. The spectral bandwidth of the acoustic signal is observed to increase nonlinearly with increasing chopper frequency

Keywords

organic compounds; photoacoustic spectra; 0.3 to 2 torr; 100 to 2000 Hz; chopper frequencies; low pressure methyl alcohol vapor; nonharmonic spectral components; nonlinear behavior; optoacoustic signal; spectral bandwidth; spectral distribution; Acoustic beams; Choppers; Energy states; Frequency; Laser feedback; Laser stability; Methanol; Photoacoustic effects; Power lasers; Pump lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Southeastcon '89. Proceedings. Energy and Information Technologies in the Southeast., IEEE

Conference_Location

Columbia, SC

Type

conf

DOI

10.1109/SECON.1989.132565

Filename

132565