A rapid, high sensitivity differential absorption carbon monoxide monitor (DACOM) has been developed to measure CO from an aircraft. The differential absorption measurement is accomplished by rapidly current tuning the wavelength of a PbSSe diode laser across a single 4.7 micron CO absorption line. As the laser wavelength sweeps periodically across the absorption line, the laser beam is amplitude modulated and is then synchronously detected. With this technique a minimum detectable differential transmission of 0.02% is obtained for a 1 second integration time. This performance is equivalent to a CO sensitivity of 5 ppb for a 10 meter absorption path. The techniques used to achieve this high sensitivity will be discussed. In the aircraft installation a 10 meter absorption path is located in the airstream along the fuselage of a C-54 aircraft. During flight tests of DACOM, a sensitivity of 20 ppb for a 1-second integration time has been achieved.


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    Title :

    DACOM - A rapid, high sensitivity airborne carbon monoxide monitor


    Contributors:
    Sachse, G. W. (author) / Hill, G. F. (author) / Wade, L. O. (author) / Condon, E. P. (author)

    Conference:

    In: Joint Conference on Sensing of Environmental Pollutants ; 1977 ; New Orleans, LA


    Publication date :

    1978-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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