In-Situ Measurement Of Ammonia With A 13CO2-Waveguidelaser System

H. Neckel; J. Wolfrum

doi:10.1117/12.968918

16 January 1988 In-Situ Measurement Of Ammonia With A ¹³CO₂-Waveguidelaser System

H. Neckel, J. Wolfrum

Proceedings Volume 0952, Laser Technologies in Industry; (1988) https://doi.org/10.1117/12.968918
Event: Laser Technologies in Industry, 1988, Porto, Portugal

Abstract

A laser gas monitoring system has been developed to measure in-situ concentrations of gaseous pollutints (in our case ammonia) at various temperatures. The heart of the system is a tunable ¹³CO₂-waveguide laser. By varying the resonator length the laser is frequency modulated between two neighboring emission lines. One line is absorbed by the species investigated, while the other is used as a reference. By this referencing the system is autocalibrated continously. The high spectral resolution of the laser method supresses interference by other species. Fast evaluation of the digitalized signal shortens the measurement time to less than one minute. The lasers high output power is used in a multiple path arrangement, which allows the detection of ammonia concentrations in the one vppm range. First results of measurements in a power plant are reported.

Citation Download Citation

H. Neckel and J. Wolfrum "In-Situ Measurement Of Ammonia With A ¹³CO₂-Waveguidelaser System", Proc. SPIE 0952, Laser Technologies in Industry, (16 January 1988); https://doi.org/10.1117/12.968918

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