2 edition of Calibration development and transfer optothermal spectroscopy analysis found in the catalog.
Calibration development and transfer optothermal spectroscopy analysis
by FLAIR/QUEST Coordination Group
Written in English
A QUEST Action Group guideline document.
|Statement||compiled and edited by C.N.G. Scotter.|
|Series||CEC FLAIR/QUEST Concerted Action -- No. 1, Quality established by spectroscopic techniques FLAIR concerted action -- No. 1, Spectroscopic techniques for the rapid direct measurementof food quality -- COST 901|
|Contributions||Scotter, C.N.G., Commission of the European Communities. QUEST action group., Campden Food and Drink Research Association.|
|The Physical Object|
|Number of Pages||48|
, 9/10/96 PM Safety Information The Analytical Methods section describes methodologies using a wide variety of potentially hazardous chemicals (acids, bases, organic. Multivariate calibration provides a powerful tool for spectroscopy-based chemical quantification by analyzing multiple measurements of the sample responses. The primary role of multivariate calibration methods is to develop a regression model connecting the measured spectral signals to specific sample properties (such as constituent.
Near-infrared (NIR) spectroscopy is a useful technique for quantitative measurements of intact tablets, but it suffers from limitations due to the fact that changes in the physical properties of a sample strongly affect the recorded spectrum. In this work, time-resolved transmission NIR spectroscopy was utilized to conduct quantitative measurements of intact tablets. Temperature, pressure, viscosity, and other process variables fluctuate during an industrial process. When vibrational spectra are measured on- or in-line for process analytical and control purposes, the fluctuations influence the shape of the spectra in a nonlinear manner. The influence of these temperature-induced spectral variations on the predictive ability of multivariate calibration.
Calibration transfer is an important field for near-infrared (NIR) spectroscopy in practical applications. However, most transfer methods are constructed with standard samples, which are expensive and difficult to obtain. Taking this problem into account, this paper proposes a calibration transfer method based on affine invariance without transfer standards (CTAI). . Journal of Quantitative Spectroscopy and Radiative Transfer , , DOI: / Chia-Ting Chen, Daniela Banaru, Thierry Sarnet, Jӧrg Hermann. Two-step procedure for trace element analysis in food via calibration-free laser-induced breakdown spectroscopy.
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Presenting nearly 50% new and revised material, this thoroughly updated edition incorporates the latest advances in instrumentation, computerization, calibration, and method development in NIR spectroscopy. The book underscores current trends in sample preparation, calibration transfer, process control, data analysis, and commercial NIR /5(3).
In optothermal spectroscopy one detects the absorption of radiation by transferring the excitation energy to a thermal detector. The transfer is accomplished by allowing the molecules excited by the radiation to impinge upon a thermal detector, whose surface is able to accommodate the internal energy of the excited by: 4.
Calibration model transfer has played a prominent role in the practical application of NIR spectral analysis. The change of instruments and sample physical states may lead to variation of the NIR spectrum, which results in the applicability of the model in judicatory practice being unsatisfactory.
Therefore,Cited by: Sample-to-sample variability has proven to be a major challenge in achieving calibration transfer in quantitative biological Raman spectroscopy.
Multiple morphological and optical parameters, such as tissue absorption and scattering, physiological glucose dynamics and skin heterogeneity, vary significantly in a human population introducing nonanalyte specific features into the calibration Cited by: , “The development of near infrared reflectance spectroscopy calibrations for undried grass silage and their transfer to another instrument using multiple and single sample standardisation”, J.
Near Infrared Spectrosc. 7, – ().Cited by: Raman spectroscopy was used for rapid and in situ measurements of alcohols in alcohol–water binary systems. An external standard was used to eliminate factors such as laser power or instrumental effects.
Band ratios between the Raman bands of the target molecule and that of acetonitrile as external standard were calculated and found to be proportional to the. To calibrate a spectroscopy system, the user must interpolate and apply the calibration data against a measured spectrum to remove the system response.
Alternatively, the intensity calibration light source provided with IntelliCal is LED-based with a built-in integrating sphere, allowing automated relative intensity calibration from to nm. In order to enable the calibration model to be effectively transferred among multiple instruments and correct the differences between the spectra measured by different instruments, a new feature transfer model based on partial least squares regression (PLS) subspace (PLSCT) is proposed in this paper.
Firstly, the PLS model of the master instrument is built, meanwhile a PLS subspace. Vibrational spectroscopy methods are widely investigated as fast and non-destructive alternatives for postharvest quality evaluation.
As these methods measure spectral responses at a large number of wavebands correlated to the quality traits of interest, multivariate calibration equations have to be built to estimate the quality traits from the acquired spectra.
Calibration transfer involves multiple strategies and mathematical techniques for applying a single calibration database consisting of samples, reference data, and calibration equations to two or more instruments. The instruments used for initial calibration development and transfer may be of alike or meaningfully different optical designs.
The second edition has been expanded with 50% more content covering advances in the field that have occurred in the last 10 years, including calibration transfer, units of measure in spectroscopy, principal components, clinical data reporting, classical least squares, regression models, spectral transfer, and more.
Calibration transfer for use with spectroscopic instruments, particularly for near-infrared, infrared, and Raman analysis, has been the subject of multiple articles, research papers, book chapters, and technical reviews.
There has been a myriad of approaches published and claims made for resolving the problems associated with transferring calibrations; however, the. Guidelines for the Development and Validation of Near‐Infrared Spectroscopic Methods in the Pharmaceutical Industry Applications in Life, Pharmaceutical and Natural Sciences Pharmaceutical Applications.
The trans-lycopene content of fresh tomato homogenates was assessed by means of the laser photoacoustic spectroscopy, the laser optothermal window, micro-Raman spectroscopy, and colorimetry; none of these methods require the extraction from the product matrix prior to the wet chemistry method (high-performance liquid chromatography) was used as.
Calibration transfer is indispensable for practical applications of near infrared (NIR) spectroscopy due to the need for precise and consistent measurements across different spectrometers. In this work, a method for multi-spectrometer calibration transfer is described based on independent component analysis (ICA).
Bruce Hapke, in Encyclopedia of Spectroscopy and Spectrometry (Third Edition), Abstract. Reflectance spectroscopy is an important method of measuring the absorption spectra and other properties of solids.
Because this type of measurement can be made without contacting the sample, it is a powerful technique for the remote determination of the composition of soils and. James C. Bergquist, in Experimental Methods in the Physical Sciences, Introduction.
Spectroscopy is an important tool for investigating the structure of physical systems such as atoms or molecules.
Thermal motion of free atoms and molecules gives rise to Doppler broadening of the characteristic spectral transitions, which often blurs important details of the. The transfer of multivariate calibration models is investigated between a primary (A) and two secondary Fourier transform near-infrared (near-IR) spectrometers (B, C).
The application studied in this work is the use of bands in the near-IR combination region of − cm-1 to determine physiological levels of glucose in a buffered aqueous matrix containing varying.
spark-optical emission spectroscopy analysis 62 introduction 62 preparation of calibration standards 62 optimization of melting parameters 64 melting calibration standards 70 homogeneity testing 79 assignment of consensus values 90 calibration of spark-oes 99 instrument calibration One may discuss two main scenarios regarding the subject of calibration transfer to include: (1) the concept of using the same calibration model over time on multiple instruments using similar samples and measurement conditions; or (2) for using the same calibration model to adapt to new measurement and sample conditions, such as changes in natural product phenotype.
From a financial perspective, this can save you money. While maintenance does not guarantee that you won’t need to occasionally troubleshoot issues, it can provide you with a more accurate and reliable analysis the vast majority of the time.
Beyond being a regular part of maintenance, calibration is a necessary part of any scientific process.Spectrophotometers require periodic calibration to ensure correct response of the instrument.
Infrared (IR) spectrophotometers use polystyrene as a calibration standard. A scan of the instrument with a piece of polystyrene in the sample holder will verify the presence of peaks seen on the IR spectra and the relative intensity of the peaks.
Keeping abreast of the latest techniques and applications, this new edition of the standard reference and graduate text on laser spectroscopy has been completely revised and expanded. While the general concept is unchanged, the new edition features a broad array of new material, e.g., frequency doubling in external cavities, reliable cw-parametric oscillators, 4/5(3).