Title :
Trace-level isotope concentration-ratio measurement /sup 12/CO/sub 2/-/sup 13/CO/sub 2/ laser system
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 mixtures, 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 modulation absorption-cell with synchronous detection scheme was examined theoretically. /sup 13/CO/sub 2/ in atmospheric air was readily detected and minimum detectable concentration by the present system was estimated to be 70 ppb.
Keywords :
carbon compounds; chemical variables measurement; gas lasers; gas mixtures; laser applications in medicine; patient diagnosis; radioisotope imaging; sensitivity; spectrochemical analysis; /sup 12/CO/sub 2/; /sup 12/CO/sub 2/-/sup 13/CO/sub 2/ laser system; /sup 13/CO/sub 2/; atmospheric air; carbon dioxide isotopes; composite laser system; high sensitivity measurements; intracavity absorption-cells; intracavity modulation absorption-cell; minimum detectable concentration; synchronous detection scheme; trace-level gas mixtures; trace-level isotope concentration-ratio measurement; Absorption; Carbon dioxide; Gas lasers; Geologic measurements; Isotopes; Laser theory; Laser tuning; Particle measurements; Power lasers; Signal detection;
Conference_Titel :
Lasers and Electro-Optics, 2001. CLEO/Pacific Rim 2001. The 4th Pacific Rim Conference on
Conference_Location :
Chiba, Japan
Print_ISBN :
0-7803-6738-3
DOI :
10.1109/CLEOPR.2001.970811
