Absorbance analyzer and data processing method for chromatograph
AssigneeShimadzu Corporation
InventorHiroshi Ohta
Life of this patent
Estimating the term…
Abstract
A measuring part measures the absorbance spectrum of an effluent fluid sample from a chromatograph in a constant cycle, and a base line calculating part calculates a base line including absorbance values on both ends of a designated wave number range with respect to every absorbance spectrum data as measured. A peak area calculating part calculates the peak area of the absorbance spectrum in the designated wave number range on the basis of the decided base line. A chromatogram is obtained by time change of the calculated peak area. Thus, it is possible to eliminate influences by other functional groups and fluctuation of the base line in an absorbance analyzer.
Claims16
An absorbance analyzer for obtaining a chromatograph from a series of absorbance spectra, comprising:
- a measuring part for measuring the absorbance spectra dispersed over a wave number range as components in an effluent fluid sample from a chromatograph in a constant cycle;
- a base line calculating part for deciding a base line including absorbance values on both ends of a designated wave number range with respect to each absorbance spectrum data measured by said measuring part;
- and
- a peak area calculating part for calculating the peak area of the absorbance spectra in said wave number range on the basis of decided said base line,
- thereby obtaining the chromatogram by time change of said peak area calculated by said peak area calculating part.
An absorbance analyzer for obtaining a chromatograph from a series of absorbance spectra, comprising:
- a measuring part for measuring the absorbance spectra dispersed over a wave number range as components in an effluent fluid sample from a chromatograph in a constant cycle;
- a secondary differential operating part for secondarily differentiating each absorbance spectrum data measured by said measuring part in a designated wave number range;
- and
- a peak area calculating part for calculating the area of a region between a secondary differential function obtained in the above in said designated wave number range and a wave number coordinate,
- thereby obtaining the chromatogram by time change of a peak area calculated by said peak area calculating part.
A data processing method comprising the steps of:
- measuring the absorbance spectrum of an effluent fluid sample from a chromatograph in a constant cycle;
- designating a wave number range with respect to data of measured said absorbance spectrum;
- deciding a base line to include absorbance values on both ends of designated said wave number range;
- calculating the peak area of the absorbance spectrum in said designated wave number range on the basis of decided said base line;
- and
- obtaining a chromatogram by time change of said peak area.
A data processing method comprising the steps of:
- measuring the absorbance spectrum of an effluent fluid sample from a chromatograph;
- secondarily differentiating each absorbance spectrum data while designating a wave number range;
- calculating the peak area of a region between a secondary differential function and a wave number coordinate in designated said wave number range;
- and
- obtaining a chromatogram by time change of said peak area.
Dependencies are inferred from the claim text.