Abstract
The use of adaptive Kalman and Wiener filters and the empirical mode decomposition algorithm for processing the experimental signal obtained by the tunable diode laser absorption spectroscopy method has been reported to improve the sensitivity of the measurement of 13CO2 content in human expiratory air. A laser diode, tunable in the range 4860–4880 cm−1 near the wavelength of 2 µm, is used as a source. It has shown that the application of these filters ensures a detection sensitivity of 13CO2 at the level of 1015 cm−3, while the minimum detectable fraction of 13CO2 in a mixture with the 12CO2 is 3.8 · 10−5.
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