The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Eduardo Moltó - One of the best experts on this subject based on the ideXlab platform.
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calibration transfer between nir diode array and ft nir Spectrophotometers for measuring the soluble solids contents of apple
Postharvest Biology and Technology, 2007Co-Authors: Ma Carmen Alamar, Els Bobelyn, Jeroen Lammertyn, Bart Nicolai, Eduardo MoltóAbstract:Abstract Prediction models of soluble solids contents of fruit obtained with a specific near-infrared spectrophotometer cannot be directly transferred to another spectrophotometer. In this research, a piecewise direct standardization method has been used for this task. As a result, a calibration model for soluble solids contents of apple developed on a Fourier transform based spectrophotometer has been successfully transferred to a diode array (DA) spectrophotometer. The standardization procedure was performed on a data set of 477 Jonagored apples and root mean squared error of prediction of 0.85° Brix was obtained. Additionally, the necessity of calibration transfer procedures between two DA Spectrophotometers of the same type and model has also been found.
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Calibration transfer between NIR diode array and FT-NIR Spectrophotometers for measuring the soluble solids contents of apple
Postharvest Biology and Technology, 2007Co-Authors: Ma Carmen Alamar, Bart M. Nicolai, Els Bobelyn, Jeroen Lammertyn, Eduardo MoltóAbstract:Prediction models of soluble solids contents of fruit obtained with a specific near-infrared spectrophotometer cannot be directly transferred to another spectrophotometer. In this research, a piecewise direct standardization method has been used for this task. As a result, a calibration model for soluble solids contents of apple developed on a Fourier transform based spectrophotometer has been successfully transferred to a diode array (DA) spectrophotometer. The standardization procedure was performed on a data set of 477 Jonagored apples and root mean squared error of prediction of 0.85° Brix was obtained. Additionally, the necessity of calibration transfer procedures between two DA Spectrophotometers of the same type and model has also been found. © 2007 Elsevier B.V. All rights reserved.
D Allen - One of the best experts on this subject based on the ideXlab platform.
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comparison of near infrared transmittance and reflectance measurements using dispersive and fourier transform Spectrophotometers
Metrologia, 2002Co-Authors: Simon G Kaplan, Leonard M Hanssen, Edward A Early, Maria E Nadal, D AllenAbstract:A spectrophotometer based on an integrating sphere coupled to a commercial Fourier Transform Infrared (FTIR) instrument has been constructed for regular spectral transmittance and reflectance measurements over the 1 µm to 18 µm wavelength region. Despite the large number of sources of error that often limit the radiometric accuracy of FTIR measurements, we demonstrate uncertainties similar to established dispersive instrumentation. We performed near-normal-incidence reflectance and transmittance measurements on a series of samples over the 1 µm to 2.5 µm wavelength range using both FTIR and dispersive Spectrophotometers. The results are compared, taking into account any differences in measurement geometry among the various systems and the combined measurement uncertainty. We find agreement within the combined uncertainties over most of the measured spectral region.
Guangwu Xu - One of the best experts on this subject based on the ideXlab platform.
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Pacific Conference on Computer Graphics and Applications - Virtual spectrophotometric measurements for biologically and physically-based rendering
2000Co-Authors: Gladimir V. G. Baranoski, Jon G. Rokne, Guangwu XuAbstract:The main topic of the paper is virtual Spectrophotometers, virtual spectrophotometry and strategies for reducing the number of samples required to obtain asymptotically convergent measurements. A brief section on applications of virtual spectrophotometry is presented. This is followed by a careful formulation of virtual Spectrophotometers. A virtual spectrophotometer, being a virtual device, is only described by its geometry.
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Virtual spectrophotometric measurements for biologically and physically-based rendering
Proceedings the Eighth Pacific Conference on Computer Graphics and Applications, 2000Co-Authors: Gladimir V. G. Baranoski, Jon G. Rokne, Guangwu XuAbstract:The main topic of the paper is virtual Spectrophotometers, virtual spectrophotometry and strategies for reducing the number of samples required to obtain asymptotically convergent measurements. A brief section on applications of virtual spectrophotometry is presented. This is followed by a careful formulation of virtual Spectrophotometers. A virtual spectrophotometer, being a virtual device, is only described by its geometry.
Ma Carmen Alamar - One of the best experts on this subject based on the ideXlab platform.
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calibration transfer between nir diode array and ft nir Spectrophotometers for measuring the soluble solids contents of apple
Postharvest Biology and Technology, 2007Co-Authors: Ma Carmen Alamar, Els Bobelyn, Jeroen Lammertyn, Bart Nicolai, Eduardo MoltóAbstract:Abstract Prediction models of soluble solids contents of fruit obtained with a specific near-infrared spectrophotometer cannot be directly transferred to another spectrophotometer. In this research, a piecewise direct standardization method has been used for this task. As a result, a calibration model for soluble solids contents of apple developed on a Fourier transform based spectrophotometer has been successfully transferred to a diode array (DA) spectrophotometer. The standardization procedure was performed on a data set of 477 Jonagored apples and root mean squared error of prediction of 0.85° Brix was obtained. Additionally, the necessity of calibration transfer procedures between two DA Spectrophotometers of the same type and model has also been found.
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Calibration transfer between NIR diode array and FT-NIR Spectrophotometers for measuring the soluble solids contents of apple
Postharvest Biology and Technology, 2007Co-Authors: Ma Carmen Alamar, Bart M. Nicolai, Els Bobelyn, Jeroen Lammertyn, Eduardo MoltóAbstract:Prediction models of soluble solids contents of fruit obtained with a specific near-infrared spectrophotometer cannot be directly transferred to another spectrophotometer. In this research, a piecewise direct standardization method has been used for this task. As a result, a calibration model for soluble solids contents of apple developed on a Fourier transform based spectrophotometer has been successfully transferred to a diode array (DA) spectrophotometer. The standardization procedure was performed on a data set of 477 Jonagored apples and root mean squared error of prediction of 0.85° Brix was obtained. Additionally, the necessity of calibration transfer procedures between two DA Spectrophotometers of the same type and model has also been found. © 2007 Elsevier B.V. All rights reserved.
Alessandro Vichi - One of the best experts on this subject based on the ideXlab platform.
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Scientific of Colour Reading With a Clinical and a Laboratory Spectrophotometer
Vacuum, 1990Co-Authors: Gabriele Corciolani, Alessandro VichiAbstract:Objectives: The aim of this study was to evaluate the repeatability of readings with a clinical spectrophotometer in comparison with a laboratory one. Materials and Methods: A stand alone clinical spectrophotometer (Easyshade, Vita) and a laboratory one (PSD1000, Ocean Optics) were evaluated. Five ceramic disks were produced in different layering, with a fixed total thickness of the samples being maintained. Metal disks of 15mm in diameter and 0.7mm thickness were cast. The ceramic system used for layering was Omega 900 (Vita), and the colour selected for the trial was A3. The colour evaluation of each sample was repeated 5 times with each spectrophotometer to verify the scanning repeatability. The spectrophotometer repeatability was statistically evaluated analyzing the coefficient of variation (CV), which represents the ratio of the standard deviation to the mean of the CIELab* colour values. Results: An excellent scanning repeatability for both the Spectrophotometers tested was demonstrated. Very low values of the coefficient of variation (0,002
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Repeatability of Color Reading With A Clinical and A Laboratory Spectrophotometer
International Dentistry SA, 1990Co-Authors: Gabriele Corciolani, Alessandro VichiAbstract:Objectives: The aim of this study was to evaluate the repeatability of readings with a clinical spectrophotometer in comparison with a laboratory one. Materials and Methods: A stand alone clinical spectrophotometer (Easyshade, Vita) and a laboratory one (PSD1000, Ocean Optics) were evaluated. Five ceramic disks were produced in different layering, with a fixed total thickness of the samples being maintained. Metal disks of 15mm in diameter and 0.7mm thickness were cast. The ceramic system used for layering was Omega 900 (Vita), and the colour selected for the trial was A3. The colour evaluation of each sample was repeated 5 times with each spectrophotometer to verify the scanning repeatability. The spectrophotometer repeatability was statistically evaluated analyzing the coefficient of variation (CV), which represents the ratio of the standard deviation to the mean of the CIELab* colour values. Results: An excellent scanning repeatability for both the Spectrophotometers tested was demonstrated. Very low values of the coefficient of variation (0,002