Photoacoustic Measurements of the CO₂ Absorption Coefficients within Infrared Region of CO₂ Laser Spectrum

摘要

Absorption coefficients of the carbon dioxide (CO 2 ) were measured at atmospheric pressure and room temperature by photoacoustic technique with a cw, line-tunable, frequency stabilized CO 2 laser. The CO 2 laser spectrum of our system consists in 53 lines with wavelengths ranging from 9.2 μm to 10.8 μm and power levels below 5 W. Measured values of the CO 2 absorption coefficients are typically of 10 -3 atm -1 cm -1 order of magnitude, with the highest absorption coefficient of 3.01×10 -3 atm -1 cm -1 observed at 9P(18) laser transition. Compared with other values reported in the literature, the obtained results revealed a good agreement.