Absorption and Scattering of Light
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Video in TIB AV-Portal:
Absorption and Scattering of Light
IWF (Göttingen)
Formal Metadata
| Title |
Absorption and Scattering of Light
|
| Alternative Title |
Absorption und Streuung
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| Author |
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| License |
CC Attribution - NonCommercial - NoDerivatives 3.0 Germany:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor. |
| Identifiers |
|
| IWF Signature |
C 13094
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| Publisher |
|
| Release Date |
2007
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| Language |
English
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| Other Version(s) | German |
| Producer |
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| Production Year |
2004
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Technical Metadata
| IWF Technical Data |
Video ; F, 6 min 6 sec
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Content Metadata
| Subject Area | |
| Abstract |
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.
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| Keywords | Frequenz Licht Lambert-Beersches Gesetz Absorptionskoeffizient Streuung Absorption absorption scattering absorption coefficient Beer-Lambert law light frequency |
| IWF Classification | Optik Physik physics optics |
00:00
Computer animation
Intensity (physics)
Scattering
Particle physics
Light
Absorption (electromagnetic radiation)
Group delay and phase delay
Absorption (electromagnetic radiation)
Light
Measurement
00:09
Extinction (astronomy)
Photometer
Intensity (physics)
Active laser medium
Refractive index
Scattering
Intensity (physics)
Reflexionskoeffizient
Optical path
Computer animation
Scattering
Absorption (electromagnetic radiation)
Material
Absorption (electromagnetic radiation)
00:46
Heat
Typesetting
Light
Computer animation
Photometer
Intensity (physics)
Active laser medium
Active laser medium
Glass
Arc lamp
Absorption (electromagnetic radiation)
Flight
01:33
Computer animation
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01:46
Light
Kosmischer Staub
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01:59
Light
Computer animation
Photometer
Intensity (physics)
Hull (watercraft)
03:12
Light
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Opacity (optics)
Hull (watercraft)
Active laser medium
Intensity (physics)
Absorption (electromagnetic radiation)
Absorption (electromagnetic radiation)
03:39
Typesetting
Direct current
Computer animation
Scattering
Active laser medium
Particle
04:09
Light
Wavelength
Wavelength
Computer animation
Scattering
Glass
Water vapor
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04:38
Light
Wavelength
Wavelength
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Intensity (physics)
Sensor
Scattering
Scattering
Gruppensteuerung
Power (physics)
Intensity (physics)
Light
05:16
Audio frequency
Extinction (astronomy)
Number density
Audio frequency
Intensity (physics)
Active laser medium
Scattering
Extinction (astronomy)
Active laser medium
Particle
Power (physics)
Intensity (physics)
Particle
Light
Wavelength
Wavelength
Computer animation
Scattering
Nanotechnology
Remotely operated underwater vehicle
Cross section (physics)
Density
Absorption (electromagnetic radiation)
Absorption (electromagnetic radiation)
06:06
Electric power distribution
00:04
absorption and scattering of light the intensity of the light source can be
00:12
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
00:38
composed of absorption and scattering and describes the decrease of intensity inside a medium the and absorption the
00:49
light entering the medium is converted into other types of energy mostly heat the to examine this phenomenon we use this set up
01:00
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
01:34
intensity in relax the potassium manganate solution in this
01:41
container goes through this tube which can be closed by a clip and into
01:46
this beaker dust the light has to pass through a layer of increasing thickness the particles in the solution are
01:54
so small that practically no scattering workers during the
02:04
experimental procedure 1 sees
02:06
the slowly filling beaker the photometer and a diagram that shows the intensity of the light a gains the depths of the absorber but
03:13
the exponential decrease is clearly visible but a fitting graph gives the absorption coefficient of the solution this is described in
03:29
general by landed all of absorption at scattering and the light
03:42
is not converted to other types of energy but the re-emitted in all directions an analogous set
03:56
up this time with a water-filled because it is used to examine scattering the thank
04:09
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
04:34
of scattering from the wavelength is examined 1 sees clearly that
04:40
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
04:58
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
05:17
thus the scattering is inversely proportional to the 4th power of the wavelength m proportional to the 4th power of the frequency using
05:28
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
