Title :
High sensitivity isotope concentration-ratio measurement CO/sub 2/ infrared laser system. II
Author :
Matsushima, T. ; Kawanabe, J. ; Maekawa, H. ; Saimi, S. ; Sueta, T. ; Cho, Y.
Author_Institution :
Nara Nat. Coll. of Technol., Japan
Abstract :
For high sensitivity measurements of isotope concentration-ratios of trace-level gas mixture, particularly including carbon dioxide isotopes, we tested a /sup 12/CO/sub 2/-/sup 13/CO/sub 2/ composite laser system containing intracavity absorption cells. Sensitivity enhancement obtainable by the intracavity absorption cell configuration is examined theoretically. /sup 13/CO/sub 2/ in atmospheric air is readily detected and minimum detectable concentration by the present system was estimated to be 70 ppb.
Keywords :
gas lasers; gas sensors; isotope detection; laser tuning; measurement by laser beam; /sup 12/CO/sub 2/-/sup 13/CO/sub 2/; CO/sub 2/; composite laser system; infrared laser system; intracavity absorption cells; isotope concentration-ratio measurement; minimum detectable concentration; sensitivity enhancement; trace-level gas mixture; Carbon dioxide; Chemical industry; Electromagnetic wave absorption; Gas detectors; Gas lasers; Geologic measurements; Isotopes; Laser theory; Laser tuning; Particle measurements;
Conference_Titel :
Infrared and Millimeter Waves, 2000. Conference Digest. 2000 25th International Conference on
Conference_Location :
Beijing, China
Print_ISBN :
0-7803-6513-5
DOI :
10.1109/ICIMW.2000.892976
