1 edition of Table of scattering coefficients from reflectance measurements found in the catalog.
Table of scattering coefficients from reflectance measurements
by Electrochemicals Dept., E.I. duPont de Nemours & Co. in Wilmington, Del
Written in English
|Statement||compiled by David H. Scheiber|
|Series||TAPPI C.A. report -- no.4|
|Contributions||Scheiber, David H|
|The Physical Object|
|Pagination||48 p. ;|
|Number of Pages||48|
Reflectance of the surface of a material is its effectiveness in reflecting radiant energy. It is the fraction of incident electromagnetic power that is reflected at an interface. The reflectance spectrum or spectral reflectance curve is the plot of the reflectance as a function of wavelength. Other components of the CLAMS experiment that are of interest in this work are the in situ measurements of aerosol scattering and absorption coefficients (Magi et al. ) and aerosol extinction optical depths (Redemann et al. ) collected by the instruments aboard the University of Washington Convair (CV) research aircraft, the Cited by:
where μ s is the scattering coefficient, p (θ) is the phase function (the probability distribution of scattering angles), and μ a is the absorption coefficient. Equation (1) describes the reflectance as the sum of photons with different pathlengths, according to the pathlength distribution p (l).The pathlength distribution only depends on the scattering properties, μ s and p (θ).Author: Anouk L. Post, Anouk L. Post, Henricus J. C. M. Sterenborg, Fransien G. Woltjer, Ton G. van Leeuwen. Mass attenuation coefficient, mass absorption coefficient, and mass scattering coefficient are defined as,,, where ρ m is the mass density.. Napierian and decadic attenuation coefficients. Decadic attenuation coefficient or decadic narrow beam attenuation coefficient, denoted μ 10, is defined as = . Just as the usual attenuation coefficient measures the number of e-fold .
the scattering angle, was calculaled. me scattering and absorption coefficients, pr and pa were then determined from measurements of diffuse reflectance and transmittance made with a pair of inlegraling spheres, by a step-wise search through a table of diffuse reflectance and transmittance versus pa and ps generated by a Monte Carlo modelCited by: Instrumental Methods for the Measurement of Reflectance and reflectance measurements reflectance spectra reflectance spectroscopy reflected radiation reflecting power reflectometer refractive index regular reflection remission function sample and reference scattering coefficient shown in Figure sin2 solid solution spectrophotometer.
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Ing reflectance. This measurement may be made by directional or diffuse illumination. Fundamental to the optical property of opacity are the light scattering and the absorptive powers of the paper, commonly referred to as the scattering S and absorption K Size: KB.
The coefficient of proportionality was determined using polystyrene latex. The scattering efficiency Q b [equation ()] of the cells at wavelengths of and nm was calculated from the measurements of the “scattering coefficient,” the cell diameter, and Table of scattering coefficients from reflectance measurements book number concentration.
The cells were assumed not to absorb light at the two wavelengths examined. Reflectance spectroscopy is the investigation of the spectral composi tion of surface-reflected radiation with respect to its angularly dependent intensity and the composition of the incident primary radiation.
Two limiting cases are Pages: This paper presents a relationship between the intensity collected by a single fiber reflectance device (RSF) and the fiber diameter (dfib) and the reduced scattering coefficient (μs′) and phase function (p(θ)) of a turbid medium. Monte Carlo simulations are used to identify and model a relationship between RSF and dimensionless scattering (μs′dfib).
For μs′dfib > 10 we. light-scattering coefficient by reflectance factor measurements (Kubelka-Munk method) s y coefficient calculated by application of the Kubelka-Munk equations to luminance factor data weighted with respect to the CIE illuminant C, obtained in an instrument having a specified geometry and calibrated in a specified manner, on the basis of grammage.
Hence, the measurement of a single spectrum can give information on the spectral absorption coefficient over a range of several orders of magnitude in α. This is especially true for the range n i = 10 -3 - 10 -1, where both transmission and reflection techniques are difficult.
Non- homogenous samples will lack reproducibility and will be difficult to quantify. An ideal way to mix samples for diffuse reflectance is by using the PIKE Technologies ShakIR. • Packing – the required sample depth is governed by the amount of sample scattering. The minimum necessary depth is about Size: KB.
In this thesis, diffuse reflectance spectroscopy (DRS) measurements have been combined characterization in terms of scattering coefficient, absorption coefficient, and phase function determination are also presented and evaluated.
In-vivo qDRS measurements were performed TABLE OF CONTENTSFile Size: KB. Rigg, in Total Colour Management in Textiles, Standard of reflectance factor. The CIE recommends that reflectance measurements should be made relative to a perfect diffuser, i.e.
a sample that diffusely reflects all the light incident upon it. No such surface exists, but working standards of known spectral reflectance factors are normally used, allowing the correct.
diffuse reflectance spectroscopy ing per unit layer thickness of the medium. These so-called coefficients of absorption and. scattering are generally taken to be properties of the irradiated layer, assumed to be a con- tinuum, and are experimentally by: 1. Enter Table 3 70% Ceiling reflectance CCR.1 Effective Ceiling Reflectance = 69% lectance 68% ceiling, 50% wall, effective reflectance = actual reflectance.
MF.9 Coefficient of Utilization, CU mple: Carpet 4% tive reflectance 6/18/02 Chapter Lighting Design Calculations 16/ Region 10 Auburn, WA November 4, File Size: KB. Reflectance measurements were taken from ex vivo cervical biopsies and fit to an exponential function based upon Beer's law attenuation.
The mean scattering coefficients derived were 22 cm/sup -1/ for normal tissue and 69 cm/sup -1/ for precancerous by: THE MEASUREMENT OF TRANSMISSION usage as deﬁned in ISO Standards Handbook 2 (), Cohen and Giacomo (), and Taylor (). Additional general terminology applicable to this chapter is from ASTM (), IES () IES (), Drazil () and CIE ().
The preﬁx spectral is used to denote a characteristic at a particular wavelength and is File Size: 1MB. to relate SFR measurements to scattering properties for a range of phase functions, in the absence of absorp- tion.
Since the source and detector overlap, the reflectance. Measurement of fresh filter reflectance [R f in equation (4)] – Wet the GF/F for 1 h by immersion in Milli-Q water. – Place the filter on the sample holder side facing the beam, with concave face against the beam and fiber mesh by: Reflectance and emittance spectroscopy are increasingly important tools in remote sensing and have been employed in most recent planetary spacecraft missions.
They are primarily used to measure properties of disordered materials, especially in the interpretation of remote observations of the surfaces of the Earth and other terrestrial : Bruce Hapke.
With in vivo spatially resolved reflectance measurements, Kohl et al. separated absorption from scattering and observed a biphasic scattering response similar to that of Region A. With simultaneous laser scattering and electrophysiological measurements, both Jarvis et al.
and Tao et al. found a strong correlation between electrical and optical scattering changes [ 12 Cited by: 9. In this study, the relationship between the accuracy of diffuse reflectance measurement in the integrating sphere and calculated scattering coefficient was evaluated with a system to calculate optical properties combined with an integrating sphere setup and Cited by: 3.
The absorption and transport scattering coefficients of biological tissues determine the radial dependence of the diffuse reflectance that is due to a point source. A system is described for making remote measurements of spatially resolved absolute diffuse reflectance and hence noninvasive, noncontact estimates of the tissue optical properties.
The computed reduced scattering and absorption coefficients as a function of wavelength for various concentrations of IL in the absence and presence of microbubbles are shown in Figu 11, 12, and The altered and caused by microbubbles are depicted in a solid line.
The absorption coefficient of intralipid phantom measured in the study (Figure 8) was higher Cited by:. We describe a method to estimate spectral absorption and backscattering coefficients between and nm from measurements of remote sensing reflectance across the visible spectrum.2 = − ∫ α X I I x dx 0 0 exp ()And if α is uniform and not a function of x, this becomes I = I 0 exp(−αX) Now let αa = α/n, so that equation becomes -dI /I = αandx and equation becomes I = I 0 exp (−α anX), where n is the number of atoms per unit volume.
Then αa is the atomic absorption coefficient, or atomic absorption Size: 93KB.Buy ISO PAPER - DETERMINATION OF LIGHT SCATTERING AND ABSORPTION COEFFICIENTS (USING KUBELKA-MUNK THEORY) from SAI Global ISO Describes a method for the calculation of light-scattering and light-absorption coefficients based upon diffuse reflectance measurements made under the conditions specified in ISO