SPECTROSCOPIC MEASURING DEVICE

摘要

The invention relates to spectroscopic measuring device (1) comprising a spectrally broadband light source (2), a measuring cell (3) comprising a resonator, a detector (4) and a computing unit (5), wherein the light source (2) is embodied to emit a light beam which enters through an entrance into a measuring cell (3) along a light path and emerges from the measuring cell (3) through an exit, wherein the detector (4) is arranged outside of the measuring cell (3) at the exit and embodied to output a wavelength-resolved measurement value for a light intensity of light impinging thereon, wherein the computing unit (5) has a memory unit, in which a wavelength-dependent calibration curve measured for a calibration state may be stored. The measuring device (1) comprises an evaluation detector (7) and a filtering unit (6) which is arranged in the measuring device (1) in such a way that it ensures filtering of the light component of the light beam, impinging on the evaluation detector (7), with a predetermined wavelength dependence, wherein the computing unit (5) is embodied to read measurement values from the evaluation detector (7) and ascertain a value for a calibration parameter from the measurement values, store an initial value of the calibration parameter ascertained for the calibration state, ascertain a subsequent value of the calibration parameter for a subsequent state and calculate an adaptation of the calibration curve on the basis of the difference between the initial value and the subsequent value.