Method for Standardising a Spectrometer

An infrared spectrometer comprising a measuring part and a computing part, the measuring part comprising a light source for emitting infrared light, means for positioning a sample of interest to be illuminated by the infrared light, a light detector positioned to receive infrared light having interacted with the sample, and

• the computing part comprising
• means for generating an optical spectrum from data received from the light detector,
• data defining a predetermined wavelength range of the optical spectrum in which a spectral pattern originating from a constituent of atmospheric air in the spectrometer lies,
• means for determining a wavelength dependent position value associated with the selected spectral pattern, and
• means for comparing the determined value with a corresponding reference value and calculating a standardisation formula for the optical spectrum.

A data carrier holding data representing

• software means for generating an optical spectrum from optical frequency data and corresponding spectral data,
• data defining a predetermined wavelength range of the optical spectrum in which a spectral pattern originating from a constituent of atmospheric air lies and a reference value for a wavelength dependent position value of a predetermined feature of the spectral pattern,
• software means for determining a wavelength dependent position value for the predetermined feature of the spectral pattern in the optical spectrum, and
• software means for comparing the determined value with the reference value and calculating a standardisation formula for the optical spectrum.