| 摘要 |
The invention relates to a method for identification and partial-pressure determination of two gases in an unknown anesthesia gas mixture comprising n possible gases by measuring the infrared optical radiation, transmitted through the gas mixture, that passes through m filters having different transmission wavelength ranges, in which n is a number greater than 2 and m is a number less than n. A disadvantage of the method known until now is that for the identification and partial-pressure determination, at least as many filters as there are possible gases in the unknown gas mixture are always required. The method of the invention evaluates the exit intensities, measured after passage through the filters, of the infrared optical radiation transmitted through the unknown gas mixture in such a way that with three filters, for instance, two gases in an unknown gas mixture comprising five possible gases can be identified, and their partial pressures can be determined. By dividing the partial pressures by the total pressure, it is optionally also possible to determine the concentration of the gases. First, calibration curves for the five individual gases and the three filters are created, which describe the dependency of the exit intensities of the infrared optical radiation on the partial pressures of the gases, and then the mixture pair having the two gases is ascertained along with their associated partial pressures, whose associated exit intensities best correspond to the exit intensities measured for the unknown gas mixture.
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