US 2026/0063536 A1Published application

Spectrometric measurement method and analyzer for assessing variability exhibited by measured spectra

AssigneeEndress+Hauser Optical Analysis, Inc.

InventorsRandy Benedict, Patrick Ehlers, Nicholas Skriba, Joseph B. Slater, Marc Winter, Oliver Link, Sean J. Gilliam, Jürgen Dessecker, Joel Patrow

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Abstract

A spectrometric measurement method includes: with multiple calibration light sources, exhibiting known emission spectra performing calibrations of multiple spectrometers; based on calibration data attained by these calibrations, assessing a variability exhibited by measured spectra determined by calibrated spectrometers; determining reference spectra of reference samples exhibiting known reference values of at least one measurand; based on the reference spectra and the previously assessed variability, determining synthetic spectra of reference samples exhibiting the previously assessed variability; and based on the measured reference spectra, the synthetic spectra and the corresponding reference value, determining and providing a model for determining measurement results of the at least one measurand. An analyzer for assessing the variability exhibited by measured spectra determined by calibrated spectrometers is configured to perform simulated calibrations.

Claims22

Dependent claims

A spectrometric measurement method, the method comprising:

determining a model for determining measurement results of at least one measurand of a medium in a predetermined application based on measured spectra of the medium determined by calibrated spectrometers of a given type, each calibrated spectrometer including a spectrometric unit configured to determine raw spectra of incident light according to a spectrometer-specific transfer function and a signal processor configured to determine the measured spectra based on the raw spectra and a corrected algorithm, including an algorithm and a correction for the algorithm determined during the latest calibration of the respective spectrometer,
wherein determining the model comprises:
with multiple calibration light sources exhibiting known emission spectra, performing calibrations of multiple spectrometers of the given type;
recording calibration data attained from the calibrations, including:
for each of the multiple spectrometers, recording at least one or each calibration spectrum of light emitted by one of the calibration light sources determined by the respective spectrometer during its calibration and the corresponding known emission spectrum of the respective calibration light source;
and
for each calibration spectrum determined based on the corrected algorithm employed by the respective spectrometer determining the respective calibration spectrum, recording the respective correction;
based on the calibration data, assessing a variability exhibited by measured spectra determined by calibrated spectrometers of the given type;
with at least one spectrometer of the given type, determining reference spectra of reference samples of the medium exhibiting known reference values of the at least one measurand;
based on the reference spectra and the previously assessed variability, determining synthetic spectra of reference samples exhibiting the previously assessed variability;
determining the model based on the measured reference spectra, the synthetic spectra, and the corresponding reference values;
and
providing the model.

10 more elements

An analyzer for assessing a variability exhibited by measured spectra determined by calibrated spectrometers of a given type, each spectrometer including a spectrometric unit configured to determine raw spectra of incident light according to a spectrometer-specific transfer function and a signal processor configured to determine measured spectra based on the raw spectra and an algorithm, wherein the analyzer has been configured based on calibration data to perform simulated calibrations of spectrometers of the given type and to perform the simulated calibrations by, with multiple calibration light sources exhibiting known emission spectra, performing calibrations of multiple spectrometers of the given type, the analyzer comprising:

a spectrum generator configured to provide emission spectra corresponding to the known emission spectra of the calibration light source included in the calibration data and/or including synthetic spectra determined by the spectrum generator and exhibiting a variability corresponding to the variability exhibited by known emission spectra of the multiple calibration light sources;
a soft sensor comprising a function generator and a processing unit,
wherein the function generator is configured to determine and to provide synthetic functions exhibiting a function variability exhibited by the spectrometer-specific transfer functions of spectrometer of the given type, wherein the function generator has been configured, has been trained, or has learned based on the calibration data to generate the synthetic functions such that they constitute samples of the same statistical distribution as the spectrometer-specific transfer functions of the multiple spectrometers, and
wherein the processing unit is configured to determine and to provide synthetic raw spectra of the emission spectra provided by the spectrum generator based on the synthetic functions generated by the function generator;
and
an analyzing unit configured to determine and provide a correction for the algorithm for each simulated calibration performed by the analyzer by, based on the or each emission spectrum provided by the spectrum generator and the corresponding synthetic raw spectrum generated by the soft sensor during the respective simulated calibration, determining the correction such that calibration spectra determined based on the or each synthetic raw spectrum and a corrected algorithm including the algorithm and the correction correspond to the emission spectrum based on which the respective synthetic raw spectrum has been determined.

3 more elements

Dependencies are inferred from the claim text.