... Laboratory), Hanscom Air Force Base, MA ... Wallser, 1975, "Absorption Coefficient Measurements of ... Laser Absorption Coefficients for Determining ...
DTIC Science & Technology
An automated data acquisition and reduction system is described for obtaining absorption and emission coefficients in a circular cylindrical plasma column. The data reduction is based on a zonal ring method with the absorption coefficient accounted for in...
National Technical Information Service (NTIS)
Calculations of the continuous absorption coefficient of H/sup -/ were based on ground state wave functions obtained by the Ritz variational method. The calculation of the continuous absorption coefficient of negative hydrogen and lithium ions was simplified, using a cut off Coulomb ...
Energy Citations Database
The extinction model is wavelength-coupled and based on the absorption coefficients of a number of ..... cause of the general redness of the Moon, the effective wave- ...... The wavelength-dependent coefficients for the current model ...
NASA Website
... value for the absorption coefficient and extinction coefficient for iso ... HYDROCARBONS, ABSORPTION COEFFICIENTS, INFRARED SPECTRA. ...
... x or k = o. k% = absorption coefficient to base e at a particular wavelength x = sample path length The best possible conditions ...
The National Institute of Standards and Technology (NIST) has initiated a program to provide quality-assured infrared absorption coefficient data based on NIST prepared primary gas standards. Currently, absorption coefficient data has been acquired for ap...
In this report, the calculation of riometer absorption during several PCA events of particular interest is presented. These calculations are based on earlier work in which an improved effective recombination coefficient was derived and an atmospheric mode...
The equations that are usually presented as those used to determine the absorption coefficients of materials in film form based on measurements of transmission and reflection coefficients are fundamentally incorrect. These equations omit a multiplicative factor arising from the complex nature of the refractive ...
... Title : Scattering Coefficients and the Absorption Edge of Longitudinal Coherent Sound Waves in Selected Inhomogeneous Materials. ...
... Accession Number : AD0813984. Title : PHOTOIONIZATION AND ABSORPTION COEFFICIENTS OF NO IN THE 600 - 950A REGION. ...
... Accession Number : AD0660895. Title : PHOTOIONIZATION AND ABSORPTION COEFFICIENTS OF N2O,. Corporate Author ...
... Accession Number : AD0658209. Title : ON GREY ABSORPTION COEFFICIENTS IN RADIATIVE TRANSFER. Descriptive ...
... extinction coefficient. The absorption coefficient data are used to determine parameters in a multiphoton absorption model. The ...
... Title : INFLUENCE OF ABSORPTION COEFFICIENT ON REFLECTANCE OF WATER-WATER POLLUTION CONTROL FEDERATION JOURNAL ...
... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...
... Title : ABSORPTION COEFFICIENT MEASUREMENTS OF NITROUS OXIDE AND METHANE AT DF LASER WAVELENGTHS, IN: APPLIED ...
... coefficients in a circular cylindrical plasma column. ... DATA PROCESSING, COMPUTER PROGRAMMING, THERMAL RADIATION, ABSORPTION ...
... the total backscattering coefficient and the absorption coefficients of chromophoric dissolved organic matter (CDOM)- detritus and phytoplankton). ...
This paper describes the development of a theoretical framework for quantitatively characterizing sound field diffusion based on scattering coefficient and absorption coefficient of walls. The concepts of equivalent scattering area, equivalent scatter reflection area, average scattering ...
PubMed
Kishino M., Takahashi M., Okami N. & Ichimura S. (1985) Estimation of the spectral absorption coefficients of phytoplankton in the sea. ...
... of a substrate by solving the Poisson Equation �2 � ... the same for all the compounds; thus, the ... absorption coefficient of the target compound at 248 ...
Jun 25, 2008 ... T - Transmission (continuum, resonant, Beam splitter). R - Reflectivity. - Detection efficiency. K - Absorption coefficient ...
We present a method for the measurement of small optical absorption coefficients. The method exploits the deformation of cavity Airy peaks that occur if the cavity contains an absorbing material with a nonzero thermorefractive coefficient dn/dT or a nonzero expansion coefficient ?(th). Light ...
For open ocean and coastal waters, a multiband quasi-analytical algorithm is developed to retrieve absorption and backscattering coefficients, as well as absorption coefficients of phytoplankton pigments and gelbstoff. This algorithm is based on remote-sensing reflectance models derived from ...
NASA Astrophysics Data System (ADS)
A new selection criterion for solar powered dual absorption systems is presented, and a multidimensional definition for the coefficient of performance is suggested. The traditional definition, which does not define the heat input base, is found to create misleading results with respect to machine selection, causing the dual cycle to ...
prediction, the simplified K-M model using the ratio of absorption and scattering coefficients of colorants Additivity and linearity of the scattering and absorption coefficients of the individual colorants, k!i and s (k/s)!i) is the so-called "unit k over s" of the colorant. This quantity describes the ...
E-print Network
... mixture ~Boltzmann constant K mean absorption coefficient K absorption coefficient K Planck mean absorption coefficient p K ...
... Title : Absorption Coefficient of Alkali Halides. Part I. ... Abstract : Data on absorption coefficients of alkali halides were compiled and analyzed. ...
Page 1. MRL-TDR-62-36 ACOUSTIC ABSORPTION COEFFICIENTS OF ... 11 7 Acoustic Absorption Coefficients of the Surfaces of Human Palms. ...
The optical absorption coefficient for the ternary compound ZnSiAs sub 2 , and the binary compounds GaAs and CdTe are theoretically calculated, based upon the pseudopotential technique. The experimental absorption coefficiency of GaAs agrees very very wel...
A model for estimating the contributions of phytoplankton and nonalgal particles to the total particulate absorption coefficient was developed based on their separate spectral relationships, and a constrained nonlinear optimization code was used to realize the spectral decomposition. The spectral absorption of ...
An empirical algorithm for light absorption by ocean water based on color Z. P. Lee, K. L. Carder, R. G concentration algorithms, the absorption algorithms developed can be applied to the coastal zone color scanner of South Florida. St. Petersburg Abstract. Empirical algorithms for the total absorption ...
Laser-induced damage in transparent dielectrics leads to the formation of laser-modified material as a result of exposure to extreme localized temperatures and pressures. In this work, we used an infrared thermal imaging system in combination with a fluorescence microscope to map the dynamics of the local surface temperature and fluorescence intensity under cw, UV excitation of laser-modified ...
The second part of this work describes the experimental technique of measuring the local light absorption in turbid media. The technique is based on the measurement of the amplitude of an opto-acoustic (OA) signal excited in a turbid medium under the condition of one-sided access to the object under study. An OA transducer is developed to perform the ...
... Abstract : Estimates of the optical absorption coefficients for montmorillonite, hectorite, nontronite, metabentonite, illite, and attapulgite clay minerals ...
... Accession Number : AD0770920. Title : Visible and Near Infrared Absorption Coefficients of Kaolinite and Related Clays. ...
... ADA482162. Title : Variation of Phytoplankton Absorption Coefficients in the Northern South China Sea during Spring and Autumn. ...
... A Uncertainties (2cx) of Absorptivity Coefficients of Benzene ... 3. Uncertainties for Benzene Absorptivity Coefficient Experiments ... Benzene mass rate ...
... Accession Number : ADA007040. Title : The Transmission, Absorption Coefficient, and Index of Refraction of the B-1 and FB-111 Windscreens. ...
... Title : The Calculation of Emission and Absorption Coefficients of the Positive Column of a Low-Pressure Mercury-Argon Discharge. ...
... Accession Number : ADD852649. Title : Temperature Dependence of the Absorption Coefficient of Fluorite. Descriptive Note : Journal article,. ...
... chlorophyll and non-algal particles (NAP), and it provides outputs such as phytoplankton absorption coefficient, detritus absorption coefficient ...
Planetary aeronomy - absorption and photoionization coefficients of propylene and butene-1 in vacuum
NASA Technical Reports Server (NTRS)
The sound absorption coefficients of some functional absorbents (mineral wool plates) are determined
... Accession Number : ADA036981. Title : Nitrogen Dioxide Absorption Coefficients at High Temperatures. Descriptive Note ...
... Accession Number : AD0766768. Title : Investigation of the Absorption Coefficient of Neutron Irradiated Silicon Doped with Li or Cu. ...
... Title : Determination of the Optical Absorption Coefficient of Powdered Materials Whose Particle Size Distribution and Refractive Indices Are Not ...
... in Shock Heated Propellant Mixtures for Laser-Heated Rocket Thrusters,. ... the temperature dependence of the absorption coefficient of water vapor at ...
... In the past many methods for calculating the absorption coefficient have been ... the temperature averaged over the path of the propagating ray and to ...
... Accession Number : AD0283387. Title : ACOUSTIC ABSORPTION COEFFICIENTS OF HUMAN BODY SURFACES. Corporate ...
... K G. Mueller - Provided the absorption coefficients for NO Z , 0- photodetachment, and free-free processes. (Z. Taulbee ...
... Accession Number : AD0622797. Title : ABSORPTION COEFFICIENTS OF HEATED AIR: A COMPILATION TO 24,000 K. VOLUME I. ...
... Title : ABSORPTION COEFFICIENT OF GERMANIUM AT 106 MICRONS, IN: APPLIED OPTICS, VOL 12, NO 11, P2549-2550. ...
... Title : A STUDY OF THE ABSORPTION COEFFICIENT OF SILICON IN THE WAVE LENGTH REGION BETWEEN .5 AND 1.1 MICRONS. ...
... obtained by using a new and simpler approach focussing on the extinction and the absorption coefficients (the total scattering coefficient is the ...
We present a method for measuring absorption at the 1 x 10(-5) cm(-1) level in high-quality optical materials. Using a Shack-Hartmann wave-front detector, thermal lensing in these materials may be measured. Then, the absorption coefficient may be estimated by fitting the observed deformation to a thermal lensing model ...
The absorption and scattering of oceanic aerosols are characterized using low- and high-power lasers in the near IR (1.064 microm). The imaginary part of the refractive index of sea salt inferred from low-power absorption measurements is 200x less than the commonly accepted value from the literature. The measured absorption ...
A semiempirical multiphonon model based on quantum-mechanical oscillators under a Morse potential is applied to the absorption coefficient of far-infrared transmitting materials. Known material properties are combined with absorption coefficient data to fit the empirical parameters of the ...
... and volume extinction coefficient in ... PILOTED VEHICLES, EXTINCTION, ELECTROOPTICS ... CHARTING, ABSORPTION COEFFICIENTS, CEILING ...
... anomalies to estimate the backscattering coefficient of particles and the combined absorption coefficient for colored detrital and dissolved materials. ...
... Held in Boston, Massachusetts on September 15 ... absorption, scattering, and attenuation coefficients for various ... of the attenuation coefficient and the ...
... wave by refraction, absorption, and attenuation. ... coefficients are identical in magnitude but ... ILLUSTRATIONS OF REFLECTION COEFFICIENT OF A ...
... THE ABSORPTION COEFFICIENTS AS INFLUENCED BY ELECTRIC FIELDS AND THE THERMAL EXPANSION COEFFICIENT FOR BETA-TIINS2 ...
We developed statistically-based, optical models to estimate tripton (sediment/detrital) and colored dissolved organic matter (CDOM) absorption coefficients from physical hydrographic and atmospheric properties. The models were developed for northern Gulf...
A method has been devised, based on the Kubelka-Munk theory of diffuse reflectance, for obtaining an estimate of the optical absorption coefficient of a finely powdered material which has been collected on the surface of a membrane filter. The procedure d...
Based on the fundamental theory of cylindrical waveguides and resonant cavities, the main characteristic parameters of the microwave plasma source reported in (1) are calculated. The absorption coefficient of an electromagnetic wave which is excited in H(...
... Title : TRANSMISSION OF SOUND IN SEA WATER ABSORPTION AND REFLECTION COEFFICIENTS AND TEMPERATURE GRADIENTS. ...
... Title : EXPERIMENTAL DETERMINATION OF THE ABSORPTION COEFFICIENTS OF BREMSSTRAHLUNG IN STEEL FOR BETATRON ...
... Title : CHOICE OF AN APPROPRIATE MEAN ABSORPTION COEFFICIENT FOR USE IN THE GENERAL GREY GAS EQUATIONS. ...
An analytical expression for the absorption coefficient is developed from a relationship between the
Oceanic radiance model inversion methods are used to develop a comprehensive algorithm for retrieval of the absorption coefficients of phycourobilin (PUB) pigment, type I phycoerythrobilin (PEB) pigment rich in PUB, and type II PEB deficient in PUB pigment (together with the usual "big three" inherent optical properties: the total backscattering ...
Oceanic radiance model inversion methods are used to develop a comprehensive algorithm for retrieval of the absorption coefficients of phycourobilin (PUB) pigment, type I phycoerythrobilin (PEB) pigment rich in PUB, and type II PEB deficient in PUB pigment (together with the usual big three inherent optical properties: the total backscattering ...
A new method for measuring the local light absorption coefficient in turbid media, for example, biological tissues, is proposed. The method is based on the fact that the amplitude of the excited opto-acoustic (OA) signal is proportional to the absorbed laser power density (the product of the light absorption ...
Details are presented concerning the derivation of new, standard, effective ozone absorption coefficients for use with Dobson ozone spectrophotometers. The work was performed under auspices of the World Meteorological Organization (WMO) Global Ozone Research and Monitoring Program, with the goal of improving and standardizing ozone measurements throughout ...
... The low absorption coefficient of QWR is in agreement with the lower attenuation coefficient observed for guided modes propagating in sample A ...
Sep 18, 2007 ... PROPOSAL TITLE: Multispectral Particle Absorption Monitor ... of the average aerosol absorption coefficient in the parcel of sample air. ...
... INVESIGAT ONFO THr AB~SORPTION OF INFRARED) RADIATION BY ATMOSPHERIC ... SThe portion Qf Lhe absorption coefficient due to the local ...
of the average coordination number, radial distance, and Debye�Waller coefficient of atomic shells contributing to the local environment around the absorbing atoms. The EXAFS Debye�Waller coefficient contains information.1 Co/Cr atoms, while the EXAFS Debye� Waller coefficient structural disorder increases by 0.001 0.004 �
A procedure for measuring the absorption coefficient for light propagating parallel to the surface of a GaN-based light emitting diode chip on a sapphire substrate is suggested. The procedure implies the study of emission from one end face of the chip as the opposite end face is illuminated with a light emitting diode. The ...
Knowledge of absorption coefficient values for wavelengths above the bandgap and the injected carrier density profile is an important issue for analysis of carrier dynamics in highly excited semiconductors, e.g. for evaluation of the carrier density in photoexcited layer, density-dependent recombination rate and diffusivity. In this work we present a novel ...
With the objective of determining an empirical law for the acoustic absorption of a specimen in test in a reverberant chamber, a methodology using commonly available test data is presented. The approach is based on the determination of the reverberation times at test cut off, leading to the acoustic absorption losses, then to the ...
This Java applet allows the user to calculate the linear absorption coefficient for a given crystal. The user is asked to enter several parameters before the calculation can be done. The applet can calculate the absorption coefficient in two ways: (1) The atomic mass attenuation coefficients ...
NSDL National Science Digital Library
A method, based on the optoacoustic effect for determination of the spatial distribution of the light intensity in turbid media and of the optical characteristics of such media was proposed (and implemented experimentally). A temporal profile of the pressure of a thermo-optically excited acoustic pulse was found to be governed by the absorption ...
This report is the second part of the report entitled 'Absorption Coefficient of Alkali Halides.' In this second report, data analysis on the absorption coefficient in the multiphonon absorption region is carried out for LiF, NaF, NaCl, KBr, and KI. An eq...
In this paper, a general method to calibrate the absorption coefficient of an absorber and the reduced scattering coefficient of a liquid diffusive medium, based on time-resolved measurements, is reported. An exhaustive analysis of the error sources affecting the estimation is also performed. The method has been ...
The infrared optical constants (index of refraction and extinction coefficient) and absorptance for doped bulk n-Si are calculated for electron concentrations as high as 1.3 x 10(20) cm(-3). These calculations are based on the generalized Drude-Lorentz approximation and predict nonmonotonic behavior of absorption ...
A method for experimental determination of optical characteristics of a highly-dispersive medium (radiation scattering and absorption coefficients) is described. The method is based on two mathematical models of ultrashort laser pulse propagation through a highly-dispersive medium (HDM), an axial model and a diffusion model. Milk ...
We describe a new concept for measurement of High Energy Laser (HEL) power. The technique is based upon the phenomenon of optoacoustic detection, which is a sensitive measurement of the sound waves created by absorption of a laser beam of known power with a sample of absorber material for the purpose of absorption ...
Our calculations of the absolute absorption coefficients of GaAs and biaxially strained ZnTe single crystal layers is based on a 14�14 k.p model description of the band structure close to the Brillouin-zone center of the direct-gap zinc-blende semiconductors. The parameters of this model (momentum matrix elements, band separations at ...
Estimation of the tissue optical characteristics using optical coherence tomography (OCT) requires good modeling. Present modeling of the system includes effects such as scattering of light in tissues. However, absorption effects were often neglected in the model. They may be significant depending on the tissue type and the wavelength of the light source. We present a study ...
Though the notion is firmly established that alpha, the total attenuation coefficient, consisting of the absorption coefficient, a, plus the scattering coefficient, s, should be used in the exponential attenuation law I=(I sub zero)(e to the minus alpha x...
Inherent optical property is one of the important properties of water body, which lays the foundation for the establishment of water color analytical models. By using quantity filter technology (QFT) and BB9 backscattering meter, the absorption coefficients of chromophoric dissolved organic matter (CDOM) and total suspended matters (TSM) and the ...
Researchers seek improved ways to measure the surface absorption and the bulk absorption coefficients of highly transparent materials. Procedures are presented here by which one may determine separately the surface absorption and the bulk absorption coeff...
A clear understanding of energy transfer and energy absorption in photon interactions with matter is essential for the understanding of radiation dosimetry and development of new dosimetry techniques. The concepts behind the two quantities have been enunciated many years ago and described in many scientific papers, review articles, and textbooks. Data dealing with energy ...
The absorption coefficients of stratospheric aerosols are measured using a variation on the integrating plate method. The technique is based on the decrease in the transparency of a substrate when an absorbing aerosol is deposited on it. A Lambert scatterer is placed behind the substrate to integrate forward scattered light and ...
It is shown that the conventional method (based on the thin-wall membrane theory) of studying the rate of disappearance or absorption from the lumen alone may not yield the correct intestinal wall (membrane) permeability coefficient of drugs. Potential reasons for causing this problem such as first-pass metabolism and accumulation of ...
The absorption coefficients for deuterated water as measured at 22 deuterium fluoride laser wavelengths are presented for midlatitude summer atmospheric conditions. The hydrogen deuterium oxide vapor was produced from an H2O-D2O liquid mixture. Equilibrium proportions were calculated using previous results. Stronger HDO absorption was ...
The mass absorption coefficients of BeO, MgO, CaO, Al/sub 2/O/sub 3/, Cr/ sub 2/O/sub 3/, Fe/sub 2/O/sub 3/, SiO/sub 2/, TiO/sub 2/, and ZrO/sub 2/ were measured and compared with calculated values. The mass absorption coefficients of "Chromite I," "Chromite II," and "Chromomagnesite" (refractory mixtures ...
Infra-red Absorption of Aqueous Solutions of Alkali Hydroxides, I-3?.-The absorption of various concentrations of solutions of NaOH, KOH and LiOH and of one solution each of NH4OH and CsOH was determined with reference to that of water, using two like cells with quartz windows, and a suitable spectrometer with thermopile and sensitive galvanometer. All ...
A computer program and data base are presented which can be used to calculate, with a personal computer, photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, in any element, compoun...
The problem of the choice of the aerosol optical constants and, in particular, imaginary part of the refractive index of particles in visible and infrared (IR) wavelength ranges is very important for calculation of the global albedo of the atmosphere in c...
New indium-based fluoride glasses called BIZYT, resistant to devitrification, have been investigated in order to measure their chemical durability versus humidity. The corrosion mechanism has been studied and the molar absorption coefficient of the OH par...
... used EO crystals: lithium niobate, ZnTe, CdTe), (ii ... Absorption can be affected by free carriers, but ... is derived from the linear electro-optic coefficient, r ...
... the yields of the various damages among the polymer conformations. Received: March 27, 2009; Accepted: August 31, ... coefficient (ϵ �=� A/c; A �=� UV absorption; c �=� polymer concentration) at the initi...
NBII National Biological Information Infrastructure
... Dosimetry was done with a free-air chamber. Attenuation in a cell could be neglected, because transmittance through the 10-μm thickness of a cell is 0.98 based on the tabulated mass absorption coefficient ...
An account is given of the application of a punched card electronic computer to the calculation of dose distributions in rotational cobalt therapy based on the use of an effective absorption coefficient to allow for varying patient thickness as described by Jones et al. (1956). (auth)
The formula of Drummond and Rosenbluth for the angular dependence of the absorption coefficient of cyclotron radiation from a hot plasma is too crude, and hence the numerical estimates based on this formula for the total radiation from a plasma layer were less valid than previous results. (auth)
1-x Ga x Se 2 (CIGS) solar cells have great potential because of their large optical absorption coefficient, which results from a direct energy gap and allows use of thin layers...
National Renewable Energy Laboratory (NREL)
We use an infrared thermal imaging system in combination with a fluorescence microscope to map the dynamics of the local surface temperature and fluorescence intensity under cw, UV excitation of laser-modified fused silica within a damage site. Based on a thermal diffusion model, we estimate the energy deposited via linear absorption mechanisms and derive ...
Optical absorption is closely associated with many physiologically important parameters, such as the concentration and oxygen saturation of hemoglobin, and it can be used to quantify the concentrations of non-fluorescent molecules. We introduce a method to quantify the absolute optical absorption based upon the acoustic spectra of ...
A large range of values for ultrasonic attenuation and absorption coefficients of tissues are reported in the literature. An important distinction both practically and theoretically is the magnitude of the true absorption, which characterizes the rate of conversion of ultrasonic to thermal energy, as compared with the total attenuation ...
The radiative properties of bubbles or particles embedded in an absorbing medium are investigated. We aim first to determine the conditions under which absorption by the surrounding medium must be accounted for in the calculation of the efficiency factors by comparing results from Mie theory and the far-field and near-field approximations. Then, we relate these approximations ...
Filter-based measurements are frequently used to assess light absorption by atmospheric aerosols. It is known that the absorption of aerosol collected on a filter is often higher than the absorption by suspended particles, because of multiple scattering within the filter matrix. Thus, comparisons with ...
Frequency-domain tissue spectroscopy is a method to measure the absolute absorption coefficient of bulk tissues, assuming that a representative model can be found to recover the optical properties from measurements. While reliable methods exist to calculate absorption coefficients from source-detector measurements ...
The local heat transfer coefficients on the shell-side of shell-and-tube heat exchangers for in-line tube arrangement are visualized and determined from mass transfer measurements. The mass transfer experiments are carried out using a technique based on absorption, chemical and coupled colour reaction. Local mass transfer ...
The inherent optical properties are needed when establishing the semi-analytic model in the ocean color retrieval algorithm. Using the in-situ measurements, a retrieval model for inherent optical properties from remote sensing reflectance was established. The in-situ data measured in the 2003 spring cruise over the Yellow and East China Seas is introduced. The measurement method for remote sensing ...
Present study is concerned with the photoacoustic (PA) assessment of optical absorption coefficient (?) for treated (soaking in the methylene blue dye) and untreated seeds of wheat. The determination of ?, based on the Rosencwaig and Gersho model enables the optical absorption coefficient to be ...
Absorption coefficients of gamma rays of energies 1.1715 and 1.3316 Mev from a 17.1 Mc source, Co/sup 60/, have been measured in copper, zinc, tin, lead, and mercury absorbers. Based on the geometry of Davisson and Evans, the apparatus was constructed with fine adjustments for accurate collimation. The ...
The optical characteristics of skin samples are experimentally studied ex vivo and in vitro at different storage conditions. The experiments are performed on a Cary-2415 spectrophotometer in the spectral range 400-700 nm. Based on the measured diffuse reflectance and total transmittance spectra, the spectra of the absorption and reduced scattering ...
absorption coefficients will be used in ocean color models and associated satellite sensor advance in the retrieval of inherent optical properties (whose list includes phycourobilin absorption coefficients and phycoerythrobilin absorption coefficients) was published during ...
list includes phycourobilin absorption coefficients and phycoerythrobilin absorption coefficients now been extended to include phycourobilin and phycoerythrobilin absorption coefficients within the Coastal Zone Color Scanner (CZCS) was performed from research vessels. The ...
). Sample calculations for the spectral absorption and extinction coefficients and single scattering albedo s ds 0 s ds (2) (3) where , , and ( ) are the absorption, scattering, and extinction coefficients. Then, the effective extinction coefficients (due to absorption and ...
A simple formula for calculation the gamma-ray absorption coefficient of non-homogeneous materials is presented. The non-homogeneous material is composed of two kinds of grains, of the same dimensions and different linear absorption coefficients. Dimensio...
The absorption coefficients determined by the integrating plate method and the laser transmission method are found to be comparable and highly correlated. Furthermore, a high correlation is found between these absorption coefficients and the carbon content of the aerosol in urbanized regions.
DOE Information Bridge
The spatial pulse profile makes experimental values of Two-and three photon absorption (TPA and 3PA) coefficient deviate from its true value. We report an approach taking account of the influence of pump laser pulse profile on the nonlinear absorption coefficients (NAC) in Z-scan technique. We developed a new ...
The estimate of tissue optical properties is an important challenge in biomedical science. In the research of precancerous diagnosis and glucose concentration detection, the accuracy of chromospheres concentrations measurement depends on the measurement of absorption coefficient. So determining the absorption ...
Quantitative measurements of the chromophores concentration in vivo present a challenge in photoacoustic imaging. The obtained signal depends on the absorbed optical density which is the product of absorption coefficient and local fluence. As a result of wavelength-dependent optical attenuation and scattering, the local fluence in biological media varies ...
We present a method for measuring the magnitude and sign of the nonlinear refractive and absorptive coefficients in isotropic media based on vectorial two-wave mixing. The technique consists of the measurement of the self-diffracted signals as a function of the angle between the linear polarizations of two input pulses. The technique ...
The absorption of sunlight by oceanic constituents significantly contributes to the spectral distribution of the water-leaving radiance. Here it is shown that current parameterizations of absorption coefficients do not apply to the optically complex waters of the Crimea Peninsula. Based on in situ measurements, ...
The continuum absorption coefficient (CAC) of water vapor ( k cont) in the visible region is determined for the first time from the data of laboratory measurements. For this purpose, the absorption spectra of water vapor in the region 14395-14402 cm-1 are recorded with the aid of a high-sensitivity photoacoustic spectrometer with a ...
The investigation is based on photometer, riometer, and magnetometer recordings covering a period of two years. The correlation between the three parameters was studied and was found to be very good between the auroral luminosity and the absorption of cosmic noise. Using the continuity equation the product ionization rate times recombination ...
... The ratio of attenuation coefficient to absorption coefficient was 4.94. The fractional power contained within a cone of various angles was computed. ...
... The calculated value of the extinction coefficient, k, has ... to the two-photon absorption coefficient 03 through ... to image the superconductor as current ...
extinction and scattering coefficients at 2 wavelengths, and obtaining absorption coefficient, single scattering albedo, and asymmetry parameter at these ...
... 2.5. In addition, the TPA coefficient depends sensitively on the photoexcited carrier density in small gap materials. The ...
In this paper we present a novel polychromatic dual energy algorithm with an emphasis on detection of anomalies whose physical properties are assumed to be known with some level of uncertainty. We assume that material characteristics are defined by energy independent Compton scatter and photoelectric absorption coefficients. Uncertainty in material ...
... Title : Optical Absorption Coefficient and Non-Radiative Quantum Efficiency Photopyroelectric Spectra of Pure Crystal Silicon from a Single ...
Relative matrix elements are calculated for the absorption coefficient in the indirect-absorption-edge region for uniaxially stressed silicon. The calculations are for , , and stress, for all possible phonons, for all independent polarizat...
Jan 22, 2011 ... Abstract: PH exponential sum k coefficients were computed ... of Jupiter and Saturn in a phosphine absorption band near 3 ?m. ...
... Title : EMPIRICAL INFRARED ABSORPTION COEFFICIENTS OF H2O FROM 300K TO 3000K. Descriptive Note : Technical rept.,. ...
... Title : ABSORPTION COEFFICIENTS OF HEATED AIR: A COMPILATION TO 24,000 deg K, VOLUME 2. Descriptive Note : Final rept. ...
... Accession Number : AD0087813. Title : ABSORPTION COEFFICIENTS OF AIR FROM 6000 K TO 18,000 K. Descriptive Note : Research memo.,. ...
