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This study reports on the use of Kalman’s method for filtering an experimental signal to improve the accuracy of a 13С16О2 measurement in the exhaled human breath using tunable diode laser absorption spectroscopy with a semiconductor diode laser tunable near to a wavelength of 2 µm. It is shown that Kalman’s filtration allows a 5-fold increase in the detection accuracy of 13СО2.

A novel method for noninvasive on-line diagnostics of gastrointestinal oncological diseases using a diode laser in the 4860-4880 cm −1 frequency range is proposed. The method is based on measuring the concentration of 13 С during expiration. The accuracy of the method allows performing early diagnostics of diseases.

This letter details the development of an on-line control method for carbon dioxide molecules of various isotopes contained in gaseous media on the basis of a tunable diode laser operating in the 4860–4880 cm−1 range. It shows that the sensitivity of 13С registering may amount to ~1012 cm−3.

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