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Topic: Absorption (optics)

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In the News (Sun 21 Jul 19)

  Absorption - Wikipedia, the free encyclopedia
In physics, absorption is a process in which particles of some sort encounter another material and are taken up by or even disappear in it.
Volume absorption of particles of gas or liquid in liquid or solid material is studied in physical chemistry.
Absorption should not be confused with adsorption, the formation of a liquid or gas film on a solid surface.
en.wikipedia.org /wiki/Absorb   (177 words)

 Tiger Optics Cavity Ring-Down Spectroscopy In-Depth (CRDS)
Based upon the known cross-section of this absorption line [18] and the observed value for the noise in the determination of the ring-down time, the instrument should be able to detect water vapor at a few parts per trillion (ppt) levels in nitrogen or other inert gases.
Based upon the known cross section of this absorption line [18] and the observed value for the noise in the determination of the ring-down time, the instrument should be able to detect water vapor at a few ppt levels in nitrogen or other inert gases.
This absorption coefficient is related to the number density by a known factor, the cross-section of the line.
www.tigeroptics.com /PAGES/cavity_ring-down_spec.htm   (1246 words)

In fact, regular study courses on Biomedical Optics at BSc and MSc levels are hardly available both in Europe and USA - mainly due to lack of textbooks, teaching methodology and internationally recognized study programmes.
Models of light propagation in tissues and the parameters used: absorption and scattering coefficients, anisotropy, penetration depth, transport parameters; their connection with diffuse reflectance (remission).
Absorption of haemoglobin and cytochrome aa3 in 700 - 1000 nm wavelength region.
home.lanet.lv /~spigulis/EO-97.htm   (1215 words)

 MARIJUANA OPTICS: An elaboration on the process that makes THC
When the resin spheres are separated from the dried plant material by electrostatic (3) attraction and placed on a microscope slide illuminated with a 100W incandescent bulb, they appear very dark when observed through a 300X microscope.
Since orange, red, and infrared are the component wavelengths of incandescent light, and since the absorption of light makes an object dark or opaque to the frequency of the incoming wave, one can conclude that these wavelengths are probably not directly involved in energizing the cannabinoid pathway.
Of all the ways that optics are involved in the phytochemical production of THC, the most interesting has to be how the head cells and cannabinoid molecules are tremendously magnified (8) by the resin sphere.
marijuana-optics.greatnow.com   (2134 words)

 Phytoplankton Lab: Hydrologic Optics Primer
Optics is the part of physics that deals with light in the visible spectrum.
Optics also deals with light in the invisible spectrum, infrared and ultraviolet light.
As a result of absorption, fewer photons, therefore less light, are penetrating further downward into the water column.
www.serc.si.edu /labs/phytoplankton/primer/hydrops.jsp   (1539 words)

 Category:Optics - Wikipedia, the free encyclopedia
Optics is the science of light and its interaction with matter.
For more information, see the article about Optics.
This page was last modified 04:33, 21 June 2005.
en.wikipedia.org /wiki/Category:Optics   (45 words)

 About Ion Optics: Innovators in IR Emitters, MEMS Gas Sensors, and Infrared Spectrometers   (Site not responding. Last check: 2007-10-07)
Ion Optics is the world leader in devices and surfaces which allow the tuning of infrared (IR) emission, absorption, and transmission of various surfaces and devices.
Ion Optics' wavelength control photonic crystal technology will be used many other in consumer, industrial and defense applications as well.
Ion Optics' rich history of delivering high level research projects to a diverse set of government, military and commercial organizations has played a significant role in developing our technology.
www.ion-optics.com /corporate.asp   (415 words)

 Optics Letters Review   (Site not responding. Last check: 2007-10-07)
On the basis of differential optical absorption with and without contrast enhancement, a photoacoustic angiograph of a rat brain is acquired that matches the anatomical photograph well and exhibits high spatial resolution and a much-reduced background.
The optical properties of the first layer and the absorption of the second layer could be retrieved with excellent precision, whereas the reduced scattering coefficient of the second layer was reconstructed with a large error.
A novel approach to reconstructing both the absorption and the scattering properties of a turbid medium simultaneously from steady-state broadband spectral measurements is presented that utilizes second-differential fitting to the water spectrum to estimate the optical path length in tissue.
www.medphys.ucl.ac.uk /~ryusof/jc_sep04.htm   (3832 words)

 Free Space Optics :: Technology
FSO technology enables bandwidth transmission capabilities that are similar to fiber optics, using similar optical transmitters and receivers and even enabling WDM-like technologies to operate through free space.
Absorption: Absorption occurs when suspended water molecules in the terrestrial atmosphere extinguish photons.
In scattering — unlike absorption — there is no loss of energy, only a directional redistribution of energy that may have significant reduction in beam intensity for longer distances.
www.freespaceoptics.org   (1383 words)

 II-VI INFRARED: TUTORIAL:ABSORPTION   (Site not responding. Last check: 2007-10-07)
Surface contamination due to foreign materials on the surface of optics such as dust, oil, grease, fingerprints, and hydrocarbons (that may deposit on optical surfaces due to intracavity contaminants) are leading sources of absorption, and are a primary cause of shortened optic lifetimes and effficiency.
The level of 10.6µm wavelength absorption coupled with the thermal conduction characteristics of the optic and its mount, are of prime importance in determining the performance of a laser system and the lifetime of optics in that system.
In laser vacuum calorimetry, optic samples are mounted in a vacuum for thermal isolation.
www.iiviinfrared.com /ttr_absorption.html   (704 words)

 Making Free-Space Optics Work   (Site not responding. Last check: 2007-10-07)
Because absorption dominates most of the spectrum, data must be collected in wavelength ranges that occur in an atmospheric window, with the assumption that only scattering is taking place.
In other words, the absorption coefficient is a function of the absorption strength of a given species of particle, as well as a function of the particle density.
The region from 0.7–2.0 μm is dominated by water vapor absorption, whereas the region from 2.0–4.0 μm is dominated by a combination of water and carbon dioxide absorption.
www.informit.com /articles/article.asp?p=26141   (2772 words)

 Model-Independent Analysis of the Orientation of Fluorescent Probes with Restricted Mobility in Muscle Fibers -- Dale ...
The absorption and emission transition dipole moments are a and e, respectively.
The angles between the absorption transition dipole moment a, the axis c, which is fixed in the frame of an immobile protein
FIGURE 2 Geometrical relationship between the absorption transition dipole moment a of a fluorophore, the electric vector of exciting light E, and the axis c fixed in the labeled component.
www.biophysj.org /cgi/content/full/76/3/1606   (4299 words)

 \bf University of Leicester \\ Department of Physics and Astronomy \\ Lecture Notes \\ \doctitle   (Site not responding. Last check: 2007-10-07)
Optics is a very large and complicated subject covering all aspects of the study of light.
Wave optics and classical EM theory are essentially the dynamics of light - motion with reference to forces.
If there is NO absorption then we can use the principle of reversibility to deduce relationships between the amplitudes of the 3 rays.
www.star.le.ac.uk /~rw/courses/lect220.html   (5993 words)

 Absorption references
Determination of the optical absorption coefficient of powerdered materials whose particle size distribution and refractive indices are unknown, Applied Optics, 12(3): 573-579.
Absorption of solar radiation by water vapor, oxygen, and related collision pairs in the Earth's atmosphere, Journal of geophysical research, 103(D4): 3847.
Absorption of light by soot particles: determination of the absorption coefficient by means of aethalometers, Journal of Aerosol Science, 34: 1445-1463.
www.dfis.ubi.pt /~smogo/investigacao/references.html   (8751 words)

 Ocean Optics Conference Abstracts   (Site not responding. Last check: 2007-10-07)
Absorption is not affected much by the real part of both refractive indices, while backscatter does not vary much with the imaginary refractive indices.
The absorption measurements revealed that the resuspension of bottom sediments due to stormy weather may explain the high contribution of nonalgal particles (53%) to the total particulate absorption in the area.
The three retrieved parameters are the specific absorption coefficients (absorption normalised to chlorophyll concentration) of the two populations (population 1 and 2) and the maximum concentration attainable by the population 1.
www.oceanopticsconference.org /AbstractPages/AbstractsAH.php   (16145 words)

 BORL Publications
Below are listed publications authored or co-authored by present members of the Biomedical Optics Research Laboratory on scientific and clinical topics directly related to biomedical optics since 1986.
OSA Trends in Optics and Photonics on Advances in Optical Imaging and Photon Migration, Editors: Alfano, RR, and Fujimoto, JG, (OSA, Washington DC) 21, 7-10.
OSA Trends in Optics and Photonics on Advances in Optical Imaging and Photon Migration, Editors: Alfano, RR, and Fujimoto, JG, (OSA, Washington DC) 2, 93-98.
www.medphys.ucl.ac.uk /research/borl/pub_chro.htm   (9989 words)

 Fiber and Nonlinear Optics   (Site not responding. Last check: 2007-10-07)
The calculation was based on a numerical Kramers-Kronig analysis of the carrier-related imaginary part of the dielectric function e2.
All absorption mechanisms that contribute to e2 were accounted for - absorption by direct and indirect interband transitions near the fundamental absorption edge, free-carrier absorption, intervalence-band and interconduction-band absorption, phonon absorption and interband absorption at higher energies.
It was established that soliton propagation in transmission lines where strong third-order dispersion is present can be reasonably described in terms of the second-order perturbation theory.
www.nacid.acad.bg /hightec/fiberopt.htm   (514 words)

 Ocean Optics Faculty Recent Publications
In situ phytoplankton absorption, fluorescence emission, and particulate backscattering spectra determined from reflectance.
Absorption properties of marine-derived particulate and dissolved material in Arctic sea ice.
Measurement of the spectral absorption coefficient in the ocean with an isotropic source.
www.ocean.washington.edu /courses/oc590/recentpubs.html   (778 words)

 RASMB: Re: XL-A absorption optics   (Site not responding. Last check: 2007-10-07)
This problem is most pronounced at low wavelength, since the pi to pi* absorption band of the peptide bond can be quite sharp and have a steep shoulder.
My recommendation is to make a wavelength scan of the sample and find the exact peak of the absorption.
You can find out the effect for yourself by finding the point of the steepest slope in the absorption band and measure a scan across the entire cell by running it at a slow speed so it doesn't sediment.
www.rasmb.bbri.org /rasmb_archives/1994/20.html   (307 words)

 Optics engineers and scientists contacts in all related industry: laser, fiber optics, imaging, display, astronomy, ...
Optics engineers and scientists contacts in all related industry: laser, fiber optics, imaging, display, astronomy, research, electronics.
I do mesure absorption, reflection and transmition spectra in solids, liquids and gases.
Optics2001 do not endorse, has not verified, any of the information on this website, and accepts no responsibility.
www.optics2001.com /Searchmember.php?pseudo_login=visitoo=&motsclef=absorption&rechercher=1   (112 words)

 ID29 Manual Absorption Scan Protocol
Type control-c in the OPTICS window to switch out of remote mode, and then after you are finished type remote to switch back to remote mode.
Before scanning the absorption edge it is best select the MCA channels that correspondS to the anomalous scattering element.
Before scanning the absorption edge it is best to select the MCA channels that correspond to the anomalous scattering element of interest.
www.esrf.fr /exp_facilities/ID29/id29_abs_scan_protocol.html   (1566 words)

 RASMB: XL-A absorption optics   (Site not responding. Last check: 2007-10-07)
Hi, as a newcomer in XL-A technique I have to learn something what I have not observed in such extent with the Model E using absorption or Rayleigh inter- ference optics.
For the experiments of heterologous association (different proteins or protein and nucleic acid) we need exact information about the molecular mass of the reactants under the choosen conditions and also the initial concentrations.
From these observations I would like to ask the XL-A user for similar experience or to know until to which absorption (0.8, 1.0 or somewhat higher) the Lambert law is valid for the concentration determination in XL-A? Best regards.
www.rasmb.bbri.org /rasmb_archives/1994/8.html   (281 words)

 Physics 20 - Optics - Electromagnetic Radiation
Some other light sources are capable of producing discontinuous line or band spectra, called an absorption spectrum, consisting of discrete lines or bands emitted at certain specific wavelengths.
The wavelengths which are absent are the same wavelengths which would be emitted by the same gas if it were excited.
An absorption spectrum also can give the chemical composition of the gas.
www.sasked.gov.sk.ca /docs/physics/u6c22phy.html   (743 words)

 Ocean Physics Laboratory - Coastal Mixing and Optics
Bricaud, A. and D. Stramski, Spectral absorption coefficients of living phytoplankton and nonalgal biogenous matter: A comparison between the Peru upwelling area and the Sargasso Sea, Limnol.
Cleveland, J.S., Regional models for phytoplankton absorption as a funciton of chlorophyll a concentration, J.
Hakvoort, H. and R. Doerffer, Estimation of specific absorption coefficients of turbid coastal water constituents using the AC-9 and asymptotic attenuation coefficients, SPIE Ocean Optics, 2963, 435-439, 1997.
www.opl.ucsb.edu /cmo/cmoref.html   (3660 words)

 NeuroLab > Potter Group
Brakenhoff, G. Ghauharali, R. "Analysis of efficiency of 2-photon versus single-photon absorption for fluorescence generation in biological objects".
Fischer, A. Stelzer, E. "Fluorescence of coumarins and xanthenes after 2-photon absorption with a pulsed titanium-sapphire laser".
Mukherjee, N. Reinhardt, B. "Measurement of two-photon absorption cross section of dye molecules doped in thin films of polymethylmethacrylate".
www.neuro.gatech.edu /groups/potter/2-photonRefs.html   (4098 words)

 Amazon.com: Books: Absorption and Scattering of Light by Small Particles (Wiley Science Paperback Series)   (Site not responding. Last check: 2007-10-07)
Treating absorption and scattering in equal measure, this self-contained, interdisciplinary study examines and illustrates how small particles absorb and scatter light.
Examines absorption and scattering in all types of electromagnetic radiation from radio to ultraviolet wavelengths.
The first eight chapters illustrate the basic theory of scattering and absorption, introducing expression and physics relevant to spheres, spheroids and a whole array of particles.
www.amazon.com /exec/obidos/tg/detail/-/0471293407?v=glance   (1431 words)

 Nonlinear absorption, scattering and optical limiting studies of CdS nanoparticles
The nonlinear optical absorption, scattering and optical limiting properties of CdS nanoparticles dispersed in dimethylformamide (DMF) are investigated.
The nanoparticles are synthesized using the standard chemical synthesis method with thioglycerol as the capping agent.
Strong two-photon absorption and nonlinear scattering are found to be responsible for good optical limiting characteristics in these nanoparticles.
www.opticsexpress.org /abstract.cfm?URI=OPEX-13-3-867   (446 words)

 Light and Optics: online meteorology guide
As sunlight (or moonlight) enters the atmosphere, it is either absorbed, reflected, scattered, refracted or diffracted by atmospheric particles or air molecules.
For this reason, the optical effects discussed in this module have been grouped according to the following classifications of atmospheric particles: air, dust and haze, ice crystals, and water droplets.
The navigation menu (left) for this module is called "Light, Optics" and the menu items are arranged in a recommended sequence, beginning with this introduction.
ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/opt/home.rxml   (293 words)

 Rolyn Optics Company
Our experience in the business goes back to 1925 when we first began marketing optics to the photographic industry.
During those years we represented several of the outstanding names in the world of optics and imported lenses from all over the European continent to supply the needs of American industry.
Copyright © 2004 ROLYN OPTICS CO., All rights reserved.
www.rolyn.com   (130 words)

All samples sent to NCMH should preferably be thoroughly dialysed against the selected buffer which should, when absorption optics are being used, be free of components (e.g.
If the absorption exceed this limit there are two options: the use of a 3mm path-length cell or the use of schlieren optics (on-line Model E) which result from the refractive index of the solute.
For these optics there is no upper limit to solute concentration but the lower limit is typically 1 mg/ml for proteins and polysaccharides.
www.nottingham.ac.uk /ncmh/business/AUC.html   (419 words)

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