FIELD: measuring equipment.
SUBSTANCE: method includes irradiating the sample with electromagnetic radiation at a sequence of wave numbers, determining the absorption of electromagnetic energy in the sample at a sequence of wave numbers, determining the first wave number, connected with the first absorption level of the absorption band, and the second wave number, connected with the second absorption level of the absorption band, determining the difference between the first wave number and the second wave number and determining the optical path length deviation based on the obtained difference.
EFFECT: increased spectrometer sensitivity.
16 cl, 7 dwg
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