Title :
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
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;
Conference_Titel :
Southeastcon '89. Proceedings. Energy and Information Technologies in the Southeast., IEEE
Conference_Location :
Columbia, SC
DOI :
10.1109/SECON.1989.132565
