1998
DOI: 10.1366/0003702981943932
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Hybrid Calibration Models: An Alternative to Calibration Transfer

Abstract: A new procedure for calibrating multiple instruments is presented in which spectra from each are used simultaneously during the construction of multivariate calibration models. The application of partial least-squares (PLS) and genetic regression (GR) to the problem of generating these hybrid calibrations is presented. Spectra of ternary mixtures of methylene chloride, ethyl acetate, and methanol were collected on a dispersive and a Fourier transform spectrometer. Calibration models were generated by using dif… Show more

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Cited by 33 publications
(21 citation statements)
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“…In its genetic function approximation the GA selects a whole model whose 'building blocks', called basis functions, are the original features or any possible transformation as sines, square terms or rectangular terms. The same approach is followed by Ozdemir et al [80] for the calibration of multiple instruments, showing that genetic regression is able to produce acceptable models using fewer spectra from the secondary instrument than PLS. The same group also used genetic regression to correct for wavelength drift in single-and multi-instrument calibration [81] and to obtain a multi-instrument calibration in UV-vis spectroscopy [82].…”
Section: Application Of Gas In Regressionmentioning
confidence: 91%
“…In its genetic function approximation the GA selects a whole model whose 'building blocks', called basis functions, are the original features or any possible transformation as sines, square terms or rectangular terms. The same approach is followed by Ozdemir et al [80] for the calibration of multiple instruments, showing that genetic regression is able to produce acceptable models using fewer spectra from the secondary instrument than PLS. The same group also used genetic regression to correct for wavelength drift in single-and multi-instrument calibration [81] and to obtain a multi-instrument calibration in UV-vis spectroscopy [82].…”
Section: Application Of Gas In Regressionmentioning
confidence: 91%
“…Many research groups (59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(73)(74)(75)(76) have studied the calibrations of NIR systems as problems of calibration transfer or standardization. For example, Wang et al (59) proposed direct standardization (DS) and piecewise direct standardization (PDS), and Shenk et al (60) developed an algorithm with wavelength index correction and spectral intensity correction, a patented method.…”
Section: Regarding the Calibration Transfer Methods Proposed Previouslymentioning
confidence: 99%
“…Temperature and humidity variations, for example, can have a strong influence on measurement values by altering the instrument; changes in the environment of an instrument can cause shifts in absorption bands 14 and nonlinear changes in absorption intensities in the spectra. 16 Any of these can change h À1 and thereby add additional components of variance not captured by the original model. 16 Any of these can change h À1 and thereby add additional components of variance not captured by the original model.…”
Section: Invalidating a Calibration Modelmentioning
confidence: 99%