A diode-laser sensor system based on absorption spectroscopy techniques has been developed for nonintrusive measurements of CO2 in high-temperature environments. Survey spectra of the CO2 (20°1,04°1)I–00°0 and (20°1,04°1)II–00°0 bands between 1.966 and 2.035 μm (4915–5085 cm-1) were recorded at temperatures between 296 and 1425 K in a heated static cell and compared with calculated spectra (by using the HITRAN 96/HITEMP database) to find candidate transitions for CO2 detection. High-resolution measurements of the CO2R(56) line shape [(20°1,04°1)II–00°0 band] were used to determine the transition line strength, the self-broadening half-width, and the coefficient of temperature dependence of the self-broadening half-width. The results represent what are believed to be the first measurements of CO2 absorption near 2.0 μm with room-temperature diode lasers. Potential applications of the diode-laser sensor system include in situ combustion measurements and environmental monitoring.
© 1998 Optical Society of America
Original Manuscript: May 20, 1998
Revised Manuscript: September 15, 1998
Published: December 20, 1998
Radu M. Mihalcea, Douglas S. Baer, and Ronald K. Hanson, "Diode-laser absorption measurements of CO2 near 2.0 μm at elevated temperatures," Appl. Opt. 37, 8341-8347 (1998)