Data processing device for chromatograph, data processing method, and chromatograph
To reduce an arithmetic processing load or an influence of noise at the time of virtual curve calculation processing, provided is a data processing device for a chromatograph, which is configured to execute data processing based on plot data measured by using a chromatograph, the data processing device including a virtual curve calculation data generator configured to obtain a smaller number of pieces of virtual curve calculation data than a number of pieces of the measured plot data; and an arithmetic processor ( 163 ) functioning as a virtual curve calculator configured to obtain a virtual curve based on the virtual curve calculation data.
1 . A chromatograph data processing apparatus for performing data processing based on plot data measured with a chromatograph,
wherein the chromatograph data processing apparatus comprises an arithmetic processor configured to execute the data processing based on the plot data measured by using the chromatograph,
wherein the arithmetic processor is configured to:
execute a signal pre-processing step including:
acquiring, by the arithmetic processor, digitized plot data from a signal processor configured to subject an analog signal output from a detector of the chromatograph to D/A conversion;
generating a reduced set of virtual curve calculation data from the plot data by obtaining representative values for each predetermined number of the plot data derived from a given peak width, thereby reducing noise and processing load, wherein the predetermined number is a smallest integer satisfying the following equation (1):
B≥w /( S×N ) (1)
(B: the predetermined number, w: a peak width, S: a sampling interval, N: a number of points of the virtual curve calculation data for a peak);
calculating a virtual curve based on the reduced set of virtual curve calculation data;
determining characteristic points of the plot data based on the calculated virtual curve; and
execute qualitative processing for identifying a component contained in a sample to be analyzed or quantitative calculation processing for calculating an amount of substance of the component based on the determined the characteristic points of the plot data; and
a display configured to display a chromatogram based on the determined characteristic points.
2 . The chromatograph data processing apparatus according to claim 1 ,
wherein the arithmetic processor is configured to set the peak width for each component.
3 . The chromatograph data processing apparatus according to claim 2 ,
wherein the arithmetic processor is configured to obtain a provisional start point and a provisional end point for each peak waveform in a measurement result of the chromatograph,
wherein the arithmetic processor is configured to obtain the provisional start point and the provisional end point based on whether a difference in a measured signal strength of the plot data adjacent to each other is greater than or equal to a predetermined undetectable displacement for a predetermined number of consecutive times, and
wherein the arithmetic processor is configured to obtain the peak width based on the provisional start point and the provisional end point.
4 . A chromatograph, comprising:
a chromatograph unit configured to separate and to measure components contained in a sample; and
the chromatograph data processing apparatus according to claim 1 .
5 . A chromatograph data processing method for performing data processing based on plot data measured with a chromatograph, comprising:
acquiring, by an arithmetic processor, digitized plot data from a signal processor configured to subject an analog signal output from a detector of the chromatograph to D/A conversion,
generating, by an arithmetic processor of the chromatograph, a reduced set of virtual curve calculation data from the plot data by obtaining representative values for each predetermined number of the plot data derived from a given peak width, thereby reducing noise and processing load, wherein the predetermined number is a smallest integer satisfying the following equation (1):
B≥w /( S×N ) (1)
(B: the predetermined number, w: a peak width, S: a sampling interval, N: a number of points of the virtual curve calculation data for a peak);
calculating, by the arithmetic processor, a virtual curve for obtaining a virtual curve based on the virtual curve calculation data, and
displaying, by a display of the chromatograph, a processing result obtained by the arithmetic processor and
executing qualitative processing for identifying a component contained in a sample to be analyzed or quantitative calculation processing for calculating an amount of substance of the component based on the determined the characteristic points of the plot data.