Principles Techniques And Limitations Of Near Infrared Spectroscopy Pdf


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principles techniques and limitations of near infrared spectroscopy pdf

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In the data analysis of functional near-infrared spectroscopy fNIRS , linear model frameworks, in particular mass univariate analysis, are often used when researchers consider examining the difference between conditions at each sampled time point. However, some statistical issues, such as assumptions of linearity, autocorrelation and multiple comparison problems, influence statistical inferences when mass univariate analysis is used on fNIRS time course data. In order to address these issues, the present study proposes a novel perspective, multi-time-point analysis MTPA , to discriminate signal differences between conditions by combining temporal information from multiple time points in fNIRS.

Fourier-transform infrared spectroscopy FTIR [1] is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid or gas. An FTIR spectrometer simultaneously collects high-resolution spectral data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer, which measures intensity over a narrow range of wavelengths at a time. The term Fourier-transform infrared spectroscopy originates from the fact that a Fourier transform a mathematical process is required to convert the raw data into the actual spectrum.

Multi-time-point analysis: A time course analysis with functional near-infrared spectroscopy

Near Infrared Spectroscopy: fundamentals, practical aspects and analytical applications. It is addressed to the reader who does not have a profound knowledge of vibrational spectroscopy but wants to be introduced to the analytical potentialities of this fascinating technique and, at same time, be conscious of its limitations. Essential theory background, an outline of modern instrument design, practical aspects, and applications in a number of different fields are presented. This work does not intend to supply an intensive bibliography but refers to the most recent, significant and representative material found in the technical literature. Keywords: near-infrared spectroscopy, chemometrics, instrumentation, analytical applications. Introduction and Historical Overview.

Metrics details. Near-infrared spectroscopy NIRS has become an increasingly valuable tool to monitor tissue oxygenation T oxy in vivo. Changes in the absorption and scatting of light in the —nm range has been successfully used to evaluate T oxy. The most practical devices use continuous-wave light providing relative values of T oxy. Phase-modulated or pulsed light can monitor both absorption and scattering providing more accurate signals. NIRS has been applied to a wide range of populations.

Fourier-transform infrared spectroscopy

The system can't perform the operation now. Try again later. Citations per year. Duplicate citations. The following articles are merged in Scholar.


NIRS is a noninvasive and relatively low-cost optical technique that is becoming a widely used instrument for measuring tissue O2 saturation, changes in hemoglobin volume and, indirectly, brain/muscle blood flow and muscle O2 consumption.


Novel method for shark age estimation using near infrared spectroscopy

This chapter provides a review on the state of art of the use of the visible near-infrared vis-NIR spectroscopy technique to determine mineral nutrients, organic compounds, and other physical and chemical characteristics in samples from agricultural systems—such as plant tissues, soils, fruits, cocomposted sewage sludge and wastes, cereals, and forage and silage. Currently, all this information is needed to be able to carry out the appropriate fertilization of crops, to handle agricultural soils, determine the organoleptic characteristics of fruit and vegetable products, discover the characteristics of the various substrates obtained in composting processes, and characterize byproducts from the industrial sector. All this needs a large number of samples that must be analyzed; this is a time-consuming work, leading to high economic costs and, obviously, having a negative environmental impact owing to the production of noxious chemicals during the analyses. Therefore, the development of a fast, environmentally friendly, and cheaper method of analysis like vis-NIR is highly desirable.

Using Near-Infrared Spectroscopy in Agricultural Systems

Principles, Techniques, and Limitations of Near Infrared Spectroscopy

Continuous wave near infrared spectroscopy CW NIRS provides non-invasive technology to measure relative changes in oxy- and deoxy-haemoglobin in a dynamic environment. NIRS parameters that measure O 2 delivery and capacity to utilise O 2 in the muscle have been developed based on response to physiological interventions and exercise. NIRS has good reproducibility and agreement with gold standard techniques and can be used in clinical populations where muscle oxidative capacity or oxygen delivery or both are impaired.

Marcelo V. Fernanda S. Costa c. The aim of this study was to quantitatively determine the olanzapine in a pharmaceutical formulation for assessing the potentiality of near infrared spectroscopy NIR combined with partial least squares PLS regression. The method was developed with samples based on a commercial formulation containing olanzapine and seven excipients. The method was validated in the range from 1.

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Multi-time-point analysis: A time course analysis with functional near-infrared spectroscopy

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