Abstract：Calibration of anesthetic gas detector relies on the use of standard anesthetic gases, but its preparation is costly and time consuming. To solve this problem, an equivalent simulation method for anesthetic gases is proposed. Infrared filters are used to simulate the absorption of infrared light by anesthetic gases at different concentrations and serve as standard anesthetic gas. An anesthetic gas detection system is developed. Sevoflurane gases with volume fractions between 0.23%~8.50% and infrared filters with transmittance between 36%~95% are prepared and measured. It is demonstrated that the repeatability error of the equivalent sevoflurane concentration of filters is small than 0.02% and the maximum variation of equivalent concentration induced by the temperature effect is small than 0.02%+1.5%·c (c is the volume fraction of the measured gas). It is proved that infrared filters can be used to simulate standard anesthetic gases.
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2023, Vol. 44 
