Patent ID: 11965823
Assignee: FOSS ANALYTICAL A/S
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A computing device, comprising:
a memory storing a program of instructions; and
a processor configured to execute the program of instructions to perform a method of correcting for an amplitude change in an output of a spectrometric instrument due to variations in an optical path length through a sample holder, the method including
generating, by the computer device, absorbance values relative to a zero material sample from spectral data received from the spectrometric instrument, the spectral data indicating electromagnetic absorption intensities that are detected, by the spectrometric instrument, in an unknown sample in that is exposed to electromagnetic radiation in the sample holder at a plurality of wavenumbers, the spectral data indicating the electromagnetic absorption intensities indexed against wavenumber, and
applying, by the computer device, a mathematical transform (Icorr) to the generated absorbance values to correct for the amplitude change in the output of the spectrometric instrument,
wherein the method further includes
calculating, in the computer device, the mathematical transform (Icorr) by determining a difference (Δ(SBZ)′) between
a first derivative of a logarithmic transformation of spectral data (SBZ) from the zero material sample at a first wavenumber range (x1) (log10(SBZ(x1))/), and
a first derivative of a logarithmic transformation of the spectral data (SBZ) from the zero material sample at a second wavenumber range (x2) (log10(SBZ(x2))/), and

calculating, in the computer device, the mathematical transform (Icorr) as a function inversely dependent on the determined difference (Δ(SBZ)/).