Absorption and Scattering of Light

Video in TIB AV-Portal: Absorption and Scattering of Light

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Absorption and Scattering of Light
Alternative Title
Absorption und Streuung
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C 13094
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Other Version(s) German
Universität Kaiserslautern, Fachbereich Physik, Arbeitsgruppe Jodl (Kaiserslautern)
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Video ; F, 6 min 6 sec

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In diesem Film werden die beiden Hauptursachen für die Abschwächung der Lichtintensität beim Durchgang durch Materialien untersucht. Aufbauend auf qualitativen Beobachtungen werden systematisch quantitative Messungen durchgeführt und ausgewertet. So wird bei der Absorption der exponentielle Abfall der Intensität in Abhängigkeit von der durchlaufenen Strecke herausgearbeitet, der Absorptionskoeffizient bestimmt und abschließend das Lambert-Beersche Gesetz beschrieben. Bei der Streuung wird die Abhängigkeit von der Frequenz des eingestrahlten Lichtes untersucht und die Proportionalität zur vierten Potenz herausgearbeitet.
In this movie the two main causes for the decrease of light intensity while passing through materials are examined. Based on qualitative observations quantitative measurements are performed and evaluated systematically. Thus the exponential decrease of light intensity in absorption is shown to be a function of the distance passed, which is described by Beer-Lambert law of absorption. While examining the scattering of light the dependence on the frequency of light is shown and the proportionality to the fourth power explained.
Keywords Frequenz Licht Lambert-Beersches Gesetz Absorptionskoeffizient Streuung Absorption absorption scattering absorption coefficient Beer-Lambert law light frequency
IWF Classification Optik Physik physics optics
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Electric power distribution
absorption and scattering of light the intensity of the light source can be
measured using a photometer bringing a transparent material into the optical path the intensity is only decreased by reflections in the surface the the material can be described by its refraction index if the intensity is decreased 1 needs another matter constant the extinction coefficient this coefficient is
composed of absorption and scattering and describes the decrease of intensity inside a medium the and absorption the
light entering the medium is converted into other types of energy mostly heat the to examine this phenomenon we use this set up
the light of a halogen lamp thank you is bundled violence and collimated by an iris the bundled ray of light passes through a beaker glass and the intensity of the light is measured with a photometer Hey the measuring device shows the
intensity in relax the potassium manganate solution in this
container goes through this tube which can be closed by a clip and into
this beaker dust the light has to pass through a layer of increasing thickness the particles in the solution are
so small that practically no scattering workers during the
experimental procedure 1 sees
the slowly filling beaker the photometer and a diagram that shows the intensity of the light a gains the depths of the absorber but
the exponential decrease is clearly visible but a fitting graph gives the absorption coefficient of the solution this is described in
general by landed all of absorption at scattering and the light
is not converted to other types of energy but the re-emitted in all directions an analogous set
up this time with a water-filled because it is used to examine scattering the thank
no light leaving the beaker can be seen because the water as well as the glass are passed unhindered but if milk is poured into the water and mixture with small particles is produced and the light is scattered now the dependence
of scattering from the wavelength is examined 1 sees clearly that
the red light with a longer wavelength is scatter at less than the blue light with a shorter wavelength 1 only very little intensity from the red light is lost only 10 per cent of the blue lights are original intensity or reaches the detector
examining this with different wavelengths 1 sees that the scattering decreases with the increasing wavelength cutting the wavelength in 4th power the correlation is obviously linear
thus the scattering is inversely proportional to the 4th power of the wavelength m proportional to the 4th power of the frequency using
light of only 1 wavelength the decrease of intensity can be described as analogous to the absorption according to Lambert's law the scattering coefficient is the product of the scattering cross section that describes the effective area of each particle in which the light is scattered completely and the number density of scattering particles per volume in a medium where absorption and scattering curve the extinction coefficient is the sum of both constants