| Autor: |
Mironchuk, E S, Nikolaev, I V, Ochkin, Vladimir N, Rodionova, S S, Spiridonov, Maksim V, Tskhai, Sergei N |
| Zdroj: |
Quantum Electronics; April 2009, Vol. 39 Issue: 4 p388-391, 4p |
| Abstrakt: |
The ratio of 12NO2 and 13CO2 concentrations in the human exhaled air is measured by the method of diode laser spectroscopy using a three-channel optical scheme and multipass cell. Unlike the previous measurements in the spectral range of [?]4.3 mm with a resolved rotational structure at low pressure of selected samples, the present measurements are performed in the range of [?]2 mm, in which weaker absorption bands of CO2 reside. In this case, it is possible to employ lasers and photodetectors operating at room temperature. The thorough simulation of the spectrum with collisional broadening of lines and employment of regression analysis allow one to take measurements at atmospheric pressure with the accuracy of [?]0.04%, which satisfies the requirements to medical diagnostics of ulcers. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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