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  • Spatial Resolution in IR Reflectance Imaging — NIR, MidIR

    What do we measure in reflection? For the majority of samples, transmission measurements are not possible so spectra have to be obtained by reflectance. This involves either external reflection, often divided into specular and diffuse reflection, or attenuated total reflection (ATR).

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  • Reflection properties of pressed polytetrafluoroethylene

    The reflection properties of pressed polytetrafluoroethylene powder have been under investigation by the Radio­ metric Physics Division at the National Bureau of Standards for the past five years. This material has a great po­ tential use, both as a standard of diffuse reflectance and as a coating for integrating spheres for appliions in re­

    Published in: Journal of the Optical Society of America · 1981Authors: Victor R Weidner · Jack J HsiaAffiliation: National Institute of Standards and TechnologyAbout: Polytetrafluoroethylene · Integrating sphere · Diffuse reflectionChat Online
  • DIFFUSE REFLECTANCE SPECTRA OF SEVtrRAL CLAY MINERALS

    of the diffuse reflectance of the barium sulphate white reflectance standard, which is very close to unity, except near two micrometers, where it is slightly lower. Cr,ay Mrxnner, Satrpr,ps The clay mineral samples used in this study were obtained from Ward's Natural Science Establishment.

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  • Diffuse reflectance FTIR database for the DeepDyve

    In the first one, the differences between the spectra obtained in transmittance, attenuated total reflectance and diffuse reflectance modes of some compounds (nitrates, sulphates and carbonates) that could show the inverted bands when measured with a FTIR handheld device have been studied.

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  • Ultraviolet stability and contamination analysis of

    Spectra1on is a diffuse reflectance material that is both highly Lambertian and highly reflective (>0.94 from 250 Once a high vacuum was obtained (—' 1 mm) the sample Table 1 Surface composition of the Spectralon diffuse reflectance material.

    Published in: Optical Engineering · 1993Authors: A E Stiegman · Carol J Bruegge · Arthur W SpringsteenAffiliation: Jet Propulsion LaboratoryAbout: Reflectivity · Diffuse reflectance infrared fourier transform · Mass spectrum · Mass spectChat Online
  • Diagnosis of breast cancer using diffuse reflectance

    Study Design/Methods: The physical model and the empirical model were employed to extract features from diffuse reflectance spectra measured from freshly excised breast tissues. A subset of extracted features obtained using each method showed statistically significant differences between malignant and nonmalignant breast tissues.

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  • Diffuse Reflectance Infrared Fourier Transform

    diffuse reflectance infrared Fourier transformed (DRIFT) spectroscopy, can be applied to nontransparent media and could avoid sample milling, thus being very attractive for rapid and in situ asbestos analysis on the other hand, since DRIFT is a surfacelimited analytical technique, the detection limit is larger than the FTIR classical one.

    Published in: Materials · 2014Authors: Grazia Accardo · Raffaeke Cioffi · Francesco Colangelo · Raffaele Dangelo · Luca De SAbout: Fourier transform infrared spectroscopy · Analytical chemistry · AsbestosChat Online
  • Diffuse Infrared NIR and midIR Ceramic Reflector

    The excellent low loss, diffuse reflectance of Accuflect ® IR is shown in the following diffuse reflectance and specular reflectance curves. Total reflectance can be obtained by summing the diffuse and specular components at any wavelength of interest.

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  • Diffuse reflectance spectroscopy to quantify the met

    Diffuse reflectance spectroscopy uses an analytical model of photon diffusion in turbid media derived from the diffusion theory described by Farrell, On the other hand, the high accuracy obtained from the diffuse reflectance spectroscopy technique makes it ideal for industrial appliions.

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  • DIFFUSE REFLECTANCE SPECTROSCOPY OF IRON OXIDES

    ACQUISITION OF DIFFUSE REFLECTANCE SPECTRA DR spectra are usually obtained by using a spectrophotometer equipped with a DR accesory capable of

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  • Diffuse reflectance FTIR database for the interpretation

    In the first one, the differences between the spectra obtained in transmittance, attenuated total reflectance and diffuse reflectance modes of some compounds (nitrates, sulphates and carbonates) that could show the inverted bands when measured with a FTIR handheld device have been studied.

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  • BeerLambertLaw Parametric Model of Reflectance Spectra

    well as inclusion of material properties obtained through inverse analysis of other spectral measurements. Optimizing reflectance spectra of dyed fabrics with respect to given specifiions poses the problem of optimizing diffuse reflectance materials. Diffuse reflection defines a separate

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  • DIFFUSE REFLECTANCE INFRARED SPECTROSCOPY STUDIES

    mechanisms can be obtained. This work is directed primarily to defining the surface structures and mechanisms occuring at the air/coal interface. EXPERIMANTAL Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopic analyses provide a wealth of information related to the chemical changes wrought in air oxidation of coals, as noted

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  • Facile bottomup synthesis of partially oxidized black

    UVvisNIR diffuse reflectance spectra were obtained with a Shimadzu UV3600 UVvisIR spectrophotometer. BaSO 4 was used as a reflectance standard. MicroRaman spectra were obtained using a LabRam HR800 JobinYvon spectrometer with an excitation wavelength of 633 nm.

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  • Structural Determination of Bulk and Surface Tungsten

    UVvis Diffuse Reflectance Spectroscopy (DRS). The electronic structures of the bulk tungsten oxide reference compounds and the supported tungsten oxide alysts were obtained with a Varian Cary 5E UVvis spectrophotometer employing the integration sphere diffuse reflectance attachment (Harrick Praying Mantis Attachment, DRA2). The finely

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  • Modified Wiener estimation of diffuse reflectance spectra

    We present a new method for the accurate estimation of diffuse reflectance spectra from RGB values based on Wiener estimation. In the proposed method, a system matrix obtained from the original RGB values is combined with a set of synthetic optical filters to generate another three values corresponding to

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  • Diffuse Reflectance Spectroscopy uco.es

    diffuse reflectance spectroscopy 369 ing per unit layer thickness of the medium. These socalled coefficients of absorption and stering are generally taken to be properties of the irradiated layer, assumed to be a con tinuum, and are experimentally accessible.

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  • THE INSTITUTE OF PAPER CHEMISTRY, APPLETON,

    examine the possibility of determining lignin in unbleached pulps by diffuse reflectance FTIR. It was hypothesized that if the diffuse reflectance spectrum of an unbleached pulp is obtained and a carbohydrate spectrum is subtracted from it, a lignin spectrum should result. The intensity of

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  • Theory and Appliions of Diffuse Reflectance Spectroscopy

    diffuse reflectance method is used without question to obtain approximate absorption spectra of solids in the visible and near UV, or in which attempts are made to overcome the recognized limitations of the method, namely, that diffuse reflectance spectra are not always identical to transmission spectra.

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  • Spatial Resolution in IR Reflectance Imaging — NIR, MidIR

    What do we measure in reflection? For the majority of samples, transmission measurements are not possible so spectra have to be obtained by reflectance. This involves either external reflection, often divided into specular and diffuse reflection, or attenuated total reflection (ATR).

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  • Estimation of Optical Properties of Normal and Diseased

    measurement of diffuse reflectance spectra in the visible and near infrared regions of the electromagnetic spectrum. Reflectance spectra are obtained by setting up a simple diffuse reflectance spectroscopic system based on fiber optic. Light

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  • MidInfrared Reflectivity Measurements of Diffuse

    The specific accessory used for the measurement will be determined by the information desired. The aim of this appliion note is to compare midinfrared spectral data of a diffuse sample obtained by using various reflection accessories.

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  • Diffuse Reflectance Measurement SHIMADZU EUROPA

    inside. The obtained value becomes the reflectance (relative reflectance) with respect to the reflectance of the reference standard white board, which is taken to be . When light is directed at the sample at an angle of 0°, specular reflected light exits the integrating sphere and is not detected. As a result, only diffuse reflected light

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  • Optical Efficiency Effects on Infrared Diffuse Reflection

    The highest SNR (21,200) was obtained when the FTIR was operated at 8 cm1 resolution without the diffuse reflection optics. The lowest SNR (994) was obtained at 2 cm1 resolution when the diffuse reflection sealed sample holder chamber contained ZnSe windows. Compared to results obtained with the DR optics (i.e., without the chamber), adding

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  • Potential of Diffuse Reflectance Infrared Fourier

    Diffuse reflectance spectra obtained for roasted coffees from espresso capsules. Typical average spectra obtained for the evaluated samples are shown in Fig. 2.

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  • Band Gap Determination from Diffuse Reflectance

    ments of diffuse reflectance. To this end, measurements of the diffuse reflectance of different titanium concentra tion are reported. The measurements are first used to check the calculated dependence of the diffuse reflec tance on titanium concentration, after that studying the effect of gamma radiation on the prepared glass. 2. Experimental

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  • Diffuse Reflectance Measurement – UVVis

    The obtained value becomes the reflectance (relative reflectance) with respect to the reflectance of the reference standard white board, which is taken to be . When light is directed at the sample at an angle of 0°, specular reflected light exits the integrating sphere and is not detected. As a result, only diffuse reflected light is measured.

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  • Standoff detection of solid targets with diffuse

    The reflection spectrum of a given sample is obtained using the following procedure. First, a reference scan is obtained using an "Infragold" diffuse reflectance target as the sample. Infragold from Labsphere, Inc., is an electrochemically plated diffuse gold metallic coating that has >95% reflectivity from

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  • 410Solar Visible / NIR Portable Reflectometer

    The specular beam portion is obtained by subtracting the diffuse reflectance from the total reflectance. For maximum accuracy it is calibrated with a specular calibration coupon and with a diffuse calibration coupon. The data is recorded and can be displayed in a graphical or numerical form.

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  • Use of specific peaks obtained by diffuse reflectance

    This study assessed specific peaks obtained by diffuse reflectance Fourier transform midinfrared spectroscopy (DRIFTS) for characterizing the soil organic matter (SOM) composition of

    Published in: European Journal of Soil Science · 2012Authors: Michael Scott Demyan · Frank Rasche · Elke Schulz · Marc Breulmann · Torsten MullerAffiliation: Helmholtz Centre For Environmental Research UfzChat Online
  • Eliminating Fluorescence Artifacts from Diffuse

    The true diffuse reflectance component of sodium salicylate is shown in Fig. 3 together with the diffusive reflectance component of the standard white plate obtained using the same procedure. Since the component of the standard white plate can be considered as the line, the diffuse reflectance spectrum of sodium salicylate (Fig. 4) was

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  • WO2006076810A1 Method And Apparatus For Measuring

    The approach of the present invention is to obtain quantitative information about the absorptionrelated and/or steringrelated properties from the diffuse reflectance spectra (DRS) obtained during in vivo endoscopic imaging.

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  • Infrared Microsampling by Diffuse Reflectance Fourier

    It is shown that diffuse reflectance techniques enable increased sensitivity to be obtained for infrared microsampling compared with the use of KBr micropellets. When nonabsorbing matrices, such as KCl, are used, detection limits of less than 10 ng of samples are observed.

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  • Reflectance Texas A&M Astronomical Instrumentation

    Specifically, we obtained percent reflectance values for the wavelength range of 2502500 nm and used a 5 percent reflectance standard (SRS05) obtained from Labsphere Inc. to calculate the absolute reflectance of our samples.

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  • Agarosebased Tissue Mimicking Optical Phantoms for

    Figure 5 shows an example of representative measured diffuse reflectance spectra obtained from the twolayered skin tissue phantoms having different conditions for (Figure 5a) the concentration of coffee solution C c, (Figure 5b) the concentration of whole blood C

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  • Reflection Measurements in IR Spectroscopy

    Diffuse Reflection The radiation contributing to a diffuse reflection spectrum is typically spread over a range of angles and so cannot be collected efficiently with accessories designed to measure specular reflection. A typical arrangement for diffuse reflection measurements is shown below.

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  • USE AND LIMITATIONS OF SECONDDERIVATIVE DIFFUSE

    Diffuse reflectance spectra were obtained from dry and ground powders. For the hematitic soils, spectra were taken from 380 to 750 nm at 1nm increments, using a PerkinElmer Lambda 3 spectrophotometer fit ted with a reflectance attachment (Perkin Elmer, Nor walk, Connecticut, USA).

    Published in: Clays and Clay Minerals · 1998Authors: Andreas C Scheinost · A Chavernas · V Barron · J TorrentAffiliation: Purdue UniversityAbout: Spectroscopy · Maghemite · Hematites · Lepidocrocite · Discriminant function analysisChat Online
  • FeSPECIATION IN KAOLINS: A DIFFUSE REFLECTANCE STUDY

    Diffuse reflectance spectroscopy Diffuse reflectance spectra were obtained between 7000 and 45,000 cm ~ in a digital form and at room temperature with a CARY 2300 spectrophotometer fitted with a 10cmdiameter integrating sphere coated with halon. Samples, 12 mm thick, were backfilled

    Published in: Clays and Clay Minerals · 1994Authors: Nathalie Malengreau · Jean Pierre Muller · Georges CalasAffiliation: University of Paris · Centre National De La Recherche ScientifiqueAbout: Hematites · Ferrihydrite · Clay minerals · Diffuse reflection · Speciation · LepidocrociteChat Online
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