Digitale Medien
Springer
Applied physics
51 (1990), S. 94-98
ISSN:
1432-0649
Schlagwort(e):
42.60 B
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract A laser gas monitoring system has been developed to measure in situ concentrations of ammonia at various temperatures. The concentration is determined by measuring absorption with a tunable 13CO2 waveguide laser that is frequency modulated between two adjacent emission lines. One line coincides with a strong ammonia absorption line, while the other is used as a reference. By this referencing the system is autocalibrated continuously. The high spectral resolution of the laser suppresses interferences by other species. The system was built up to be used in industrial environment and was successfully applied in the chemical industry and in several power plants. A detection limit of 1 ppm could be reached at a time constant of 5 s.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00326006
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