The Calibration of Anesthesia Vaporizers by Infrared Spectroscopy

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Abstract
A general infrared spectrophotometric method is presented by which it is possible to calibrate vaporizers for volatile anesthetics at any oxygen flow and dial setting and at any atmospheric pressure and room temperature conditions. Once a standard curve was determined at a suitable wavelength and at ambient conditions, all that is required to find the composition of a gaseous mixture from the vaporizer is to sweep and fill an infrared gas cell and to record the absorbance at the specified wavelength. Simple calculations yield the flow composition from the absorbance, the standard curve, the atmospheric pressure and the room temperature (case 1 and case 2).

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