Fraunhofer lines on CD

| 15 Comments

Photograph by Kari Tikannen.

Photography contest, Honorable Mention.

Tikkanen.Fraunhofer_Lines_on_CD.jpg

Fraunhofer lines appear in sunlight reflected off a CD. The Fraunhofer lines are the dark absorption lines superimposed upon the colored spectrum.

15 Comments

Take a look at http://en.wikipedia.org/wiki/Fraunhofer_lines which explains what’s pictured here.

For instance, the dark blue line in the pale blue section is probably the Iron absorption line.

How do I make a CD that will produce a uniform field of lines to show an accurate Fraunhofer spectrum.

Ah; ROYGBIV (minus a bit) and not CMY. :-)

Richard of york gained battles in vain.

If anyone wants to reproduce this kind of effect, there’s a quick and easy way to make a spectrometer from a cardboard cereal box and a CD. Here are some examples of light sources and their spectra as seen by the CD spectrometer.

Using Godwin’s Law (of which, The Founding Mothers accused me of using in a previous post), I would like to say that these Fraunhofer Lines appear intelligently designed for the greater glory of the Reich: Heil Dembski!

I vote for this one. Hurah

bigjohn756 said:

How do I make a CD that will produce a uniform field of lines to show an accurate Fraunhofer spectrum.

How about recording a single 80-minute long sine wave?

Nice shot, Kari!

That’s amazing! I would never have thought that the Fraunhofer lines would be visible in this way… but, of course! The Wikipedia article explanation is a good one.

Paul Burnett said:

Take a look at http://en.wikipedia.org/wiki/Fraunhofer_lines which explains what’s pictured here.

For instance, the dark blue line in the pale blue section is probably the Iron absorption line.

More likely this is the hydrogen H-beta line, which is the strongest line in the pale blue region. The strongest green line is Mg I, the strong yellow line is the sodium D line (actually two close-together lines called D1 and D2)and the strong red line is H-alpha.

In extreme red there could/should be dark O-ring due to oxygen in athmosphere, I think. It means that it should be more darker in late evening or early morning ..

Easiest way is go with DVD/CD into old dark barn where sun blinks through narrow slit of boards.

Mr.K.A.T. said:

In extreme red there could/should be dark O-ring due to oxygen in athmosphere, I think. It means that it should be more darker in late evening or early morning ..

Easiest way is go with DVD/CD into old dark barn where sun blinks through narrow slit of boards.

You are probably thinking of the atmospheric water vapour A and B bands, a bit redwards from H-alpha. I suspect the camera used to record the spectrum from the CD did not quite reach those wavelengths. However, I have seen at least one of them by eye at the extreme of deepest red (which sort of looks brown) in the solar spectrum.

What do you do if you don’t have a barn handy?

|”What do you do if you don’t have a barn handy?”|

This: http://www.student.oulu.fi/~ktikkan[…]Spektri.html

In 1.picture: S=window, Venetian blind.. M=pocket mirror on floor B=cardboard box where there is narrow slit.

Women’s are really fond of jewellery and they want it of the latest designs. They are always aware of the latest designs and the things which are in fashion. They can have knowledge about new designs from the internet also.

About this Entry

This page contains a single entry by Matt Young published on July 19, 2010 12:00 PM.

CellCraft, a subversive little game was the previous entry in this blog.

Divergence is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.

Categories

Archives

Author Archives

Powered by Movable Type 4.381

Site Meter