This photo was viewed 0 times and was downloaded in full size 0 times.

This photo was liked 0 times

Please login in order to see the source link


English: Top: Home-made phase grating, period = 2mm.

Between two glass plates, two plastic foils with vertical slits (1mm each) are placed in line oil.
Line oil and plastic foild do have about the same index of refraction,
so light gets delayed by about half a wavelength even plastic thickness is 2x20µm or so.

Bottom: Talbot effect using above grating shows a replication of grating structure.
Distance to light source is 1.5m (d*d/\lambda/4), distance to mirror is 0.75m (d*d/\lammbda/8).
Mirror degrates image quality strongly, but allows to display it on same image.

On the right hand side in the background there is a flowerpot :-)

Deutsch: Oben: Eingebau-Phasengitter (alles vom Glaser, Supermarkt, Baumarkt), Periode = 2mm..

Zwischen zwei 3mm-Glasscheiben schwimmen 2 Plastikfolien mit vertikalen Schlitzen are placed in Leinöl.
Leinöl und Plastikfolie haben einen ähnlichen Brechungsindex,
deshalb wird das Licht um ca. eine halve Wellenlänge mehr in der Folie verzögert als im Öl obwohl die Folien 2x20µm stark ist..

Unten: Talbot-Effekt mit diesem Gitter zeigt eine Kopie der Gitterstruktur.
Die Entfernung zur Lichtquelle (\lambda = 666nm) ist 1.5m (d*d/\lambda/4), der Abstand zum Spiegel ist 0.75m (d*d/\lammbda/8).
Der Spiegel verschlechtert die Bilqualität erheblich, aber erlaubt alles auf ein Bild zu bringen.

Rechts hinten ist ein Blumentopf :-)

Date 31 December 2010(2010-12-31)
Source Own work
Author OlPr


I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
This file is licensed under the Creative Commons Attribution 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).

You may select the license of your choice.

GNU Free Documentation License


Only registered users can post comments. Please login

EXIF data:
File name phasegratingandtalboteffect.jpg
Size, Mbytes 0.104296875
Mime type image/jpeg
Camera manufacturer Panasonic
Camera model DMC-FX01
Orientation of image 1
Exposure time 10/130 sec (0.0769230769231)
F number f / 2.8
Exposure program 2
ISO speed rating 80
Compressed bits per pixel 2
Exif version 0220
Lens focal length 4.6 mm
Date and time original image was generated 2011:01:02 11:26:25
Date and time image was made digital data 2011:01:02 11:26:25
Meaning of each component 
Exposure bias 1.33
Maximum lens aperture 3
Metering mode 5
Supported Flashpix version 0100
Color space information 1
Exif image width 2816
Exif image length 2112
Sensing method 2
Scene type 
Exposure mode 2
White balance 1
Digital zoom ratio 0
Focal length in 35 mm film 28 mm
Software used Ver.1.0
The images at Free-Photos.biz come mainly from Wikimedia Commons or from our own production. The photos are either in the public domain, or licensed under free linceses: Free-Photos.biz license, GPL, Creative Commons or Free-Art license. Some very few other photos where uploaded to Free-Photos.biz by our users and released into the public domain or into free usage under another free license (like GPL etc.)

While the copyright and licensing information supplied for each photo is believed to be accurate, Free-Photos.biz does not provide any warranty regarding the copyright status or correctness of licensing terms. If you decide to reuse the images from Free-Photos.biz, you should verify the copyright status of each image just as you would when obtaining images from other sources.

The use of depictions of living or deceased persons may be restricted in some jurisdictions by laws regarding personality rights. Such images are exhibited at Free-Photos.biz as works of art that serve higher artistic interests.

christianity portal