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Forums
4hv.org :: Forums :: General Science and Electronics
« Previous topic | Next topic »   

Mystery Photos from TDU

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Bjørn
Sat Jun 17 2006, 01:46AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
 		The object at the bottom is an opened Coke can. The light source has ray like structures like it was a point source of some sort, like a laser or two.
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Nik
Sat Jun 17 2006, 02:07AM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
 		You beat me too it, I was going to say a laser going beign defracted (i think thats the right word). Like how they make holograms.
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Tesladownunder
Sat Jun 17 2006, 02:38AM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
 		The laser is my argon multi line one accounting for the green and blue mosaic of dots of light when the beam is diffracted with a bit of hazy polyethylene sheet and projected onto a 4 foot diameter polystyrene disc (packing cover for a table).

Here is a couple of photos including the effect of adding a 10mW HeNe red laser similarly set up which gives the irritating effect of those old 3D pictures to be viewed with blue and red cellophane glasses. Any one got one to see if there is a 3D effect?

I am staring into a 40mW laser here. Can you see the smoke coming off my retinas?

I chose last night as the air was smokey from some recent controlled burning so shows the beams well.


1150511937 10 FT10696 Laserarheneparallelscreen

1150511937 10 FT10696 Laserarheneme


So what was the original mystery photo?

Peter
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benbradley
Mon Jun 19 2006, 03:54AM
benbradley Registered Member #312 Joined: Mon Mar 13 2006, 01:50AM
Location: Georgia, USA
Posts: 27
 		I've got a mystery photo, and it IS on topic (I'll tell what it is in maybe a week or so). I took this photo myself, the two big things are ordinary standard-size pushpins for the old-fashioned cork style bulletin boards, available at any office supply store.
I'm just posting a link rather than including the pic in the page, as it's a big pic (it sort of has to be, for you to see it):
Link2
Two questions: What are they, and how many do I have? I have many times the quantity shown in this pic, and it's possible to answer both questions with info freely available on the Internet (well, at least it is for the second one, once you have the correct answer to the first).
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Desmogod
Mon Jun 19 2006, 04:08AM
Desmogod Registered Member #139 Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
benbradley wrote ...

I've got a mystery photo, and it IS on topic

Considering the topic is mystery photos from TDU, I highly doubt that.
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Bjørn
Mon Jun 19 2006, 05:50AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
 		Was the original mystery photo a soap bubble?
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Bored Chemist
Mon Jun 19 2006, 06:08AM
Bored Chemist Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
 		ferrite core store beads?
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Steve Conner
Mon Jun 19 2006, 10:12AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		Yea, I'll vote for ferrite cores too, and it looks like you have about 4096 smile
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Richy
Mon Jun 19 2006, 11:49AM
Richy Registered Member #121 Joined: Fri Feb 10 2006, 12:39PM
Location: Bromley, UK
Posts: 10
 		Hi TDU,
In your original pic at the top looks like a bass drum pedal so I'm guessing it was your laser difracted through a bass drum skin?
Richy.
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Michael W.
Mon Jun 19 2006, 02:09PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
 		Could those be the raw plastic pellets that the push pins are formed from?
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