Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Science & Lasers



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 02-21-2011, 07:01 AM #1
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Shine a laser through a hollow tube kind of question

I think this is a science topic, I was fooling around with a cheap red laser and tried aiming it through a small piece of tubing. I noticed that no matter how well I held the two, the dot on striking a nearby surface would appear dimmer when going through the tube, as compared to without the tube.

The tube is a section from an antenna, about 5/32'nds inch inside-diameter & over 4 inches long. The laser is a pet store red pointer. I ran a Q-tip through the tube just to make sure there wasn't some lint in there and got the same result.

So if this is old news then please explain to me what's happening to the beam? The beam is less than half the diameter of the tube, and I'm reasonably certain it's not touching the inner wall of the tube.

Of course, I'm thinking of doing this again with better holding fixtures, and use my HeNe as that seems to have a more circular beam shape.

Would I actually lose less light if I replaced the tube with a 4-inch piece of optic fiber? Assuming I use that end piece that gets the beam into the fiber and not reflecting some of the emitted energy backwards... liberal use of technical terms there....


Shadetree Engineer is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 02-21-2011, 11:02 AM #2
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

I don't think the beam should be attenuated if it really does at no point strike the tube. As you state the diameter of the tube is twice that of the beam, so one would not expect any difference.

Are you should the tube is straight? If it is not, the beam could easily reflect somewhere in the bend and -appear- to go straight through.
Benm is online now   Reply With Quote
Old 02-21-2011, 11:19 AM #3
Dr_Evil's Avatar
Class 3R Laser
 
Join Date: Feb 2008
Location: Hartselle, AL
Posts: 2,305
Rep Power: 1359
Dr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond repute
Dr_Evil Dr_Evil is online now
Class 3R Laser
Dr_Evil's Avatar
 
Join Date: Feb 2008
Location: Hartselle, AL
Posts: 2,305
Rep Power: 1359
Dr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

Could it appear dimmer because you're not seeing all of the scatter around the dot?
__________________
645 to 660 - Z-bolt BTP-8E, jayrob C6 w/LOC
638 - JayRob C6 w/ML520G54
635 - Z-bolt BTE-4S
632.8 - 10mW HeNe
589 - PGL-III-C 80mW(100+ peak/average)
543 - GreeNe
532 - Optotronics RPL-260, Optotronics Pen ~20mW
520 - JayRob C6
514 - Argon SL
488 - Novalux
473 - Lasever LSR473HD-80 - 107mW peak
450 - JayRob C6 w/PL450B
445 - JayRob C6
405 - Old Leadlight that Drlava transformed (33mW), 12x in a JayRob C6 host
Multi - 2214-25MLUP ArIon
Dr_Evil is online now   Reply With Quote
Old 02-21-2011, 11:30 AM #4
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

Thats also an option, depends on if the inside of the tube is reflective or not. You'd probably need a power meter to make certain what you see is an actual difference in power.
Benm is online now   Reply With Quote
Old 02-21-2011, 05:47 PM #5
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Yeah, I was thinking about scatter. So I need to verify if the dot lost light from it's outer edge.

The tube is fair straight, that is - when held up at arms length and looking through it, it appears to be very straight.

I might need a power meter when the difference becomes less, but at the moment it's a very noticeable change, by eye.

I haven't repeated this yet, but as I don't have any plan for the day, maybe I'll just do that right now.
Shadetree Engineer is offline   Reply With Quote
Old 02-21-2011, 10:18 PM #6
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Well, I finally got around to re-running the test and it turned out to be just a reflection issue.

First, using my HeNe gas tube as a source, I taped the laser tube down to my desktop and shimmed one end until I got a fairly level beam. I checked this by taping some blank paper to a 9-volt battery so as to have a movable target. Placing that right at the tube and then at the other end of the desktop to compare the beam height, while adjusting the shim. The desktop is fairly flat.

Then I taped a piece of paper at the far end of the desktop and penciled an X with the beam right at the intersection.

Then I used a stack of bland cd's to hold the metal tubing close to the right height, adding some tightly rolled paper to adjust the height. Now I can place the tubing in the beam path at approximately the right height to have the beam travel right through it's center.

Next, I cut two thin strips of wax paper to place on each end of the tubing so I can rotate tht until the beam is centered at both ends.

So after all that and making a series of careful adjustments I can definitely say that I have learned the practical value of a good optical workbench. It was a bit difficult to get this rig centered! And I think the handheld approach was just not good enough, I think what was happening is the beam was being reflected off of the inner wall and exiting near the center of the tube, but because the tube wall absorbed some of the light, it appeared dimmer.

So common sense wins after all, I just needed more information about what was happening.

Last edited by Shadetree Engineer; 02-21-2011 at 10:50 PM. Reason: Clarification
Shadetree Engineer is offline   Reply With Quote
Old 02-22-2011, 04:10 PM #7
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

Ah well, good experimental setup

Now bend the tube and see if you can make the beam go around a corner
Benm is online now   Reply With Quote
Old 02-22-2011, 04:16 PM #8
daguin's Avatar
Super Moderator
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1877
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
daguin daguin is offline
Super Moderator
daguin's Avatar
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1877
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

Good work!

Careful set up, double checking, questioning your own results, replicating the experiment.

You are on a good path +1

Peace,
dave
__________________
How To Get Along In and Be Accepted in the Forum

If you got some value out of reading this forum, how about donating $2 to keep it going?
Click Here to donate

Love all, trust a few, do wrong to none.
-William Shakespeare
daguin is offline   Reply With Quote
Old 02-22-2011, 04:18 PM #9
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Quote:
Originally Posted by Benm View Post
Ah well, good experimental setup

Now bend the tube and see if you can make the beam go around a corner
Just what I happened to be thinking about this very moment! But I only want to put a line generator at the end of the tube, and angle that about ten degrees off-axis.

I'm not sure what it's called, but it's the kind of generator that's a cylinder with a chisel-point at it's leading edge where the beam first strikes. Not one of those cheese grill types. I need to find someone selling those at a decent price.
Shadetree Engineer is offline   Reply With Quote
Old 02-22-2011, 04:22 PM #10
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Quote:
Originally Posted by daguin View Post
Good work!

Careful set up, double checking, questioning your own results, replicating the experiment.

You are on a good path +1

Peace,
dave
Thanks. I can see how precarious it is to just hold a laser in my hand doing stuff like this!
Shadetree Engineer is offline   Reply With Quote
Old 02-23-2011, 07:16 AM #11
Plan B's Avatar
Class 1M Laser
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 9
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Plan B Plan B is offline
Class 1M Laser
Plan B's Avatar
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 9
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Default Re: Shine a laser through a hollow tube kind of question

I was "experimenting" with a similar effect and my fish tank the other day. The glass on the tank is about 1/2 inch thick and the edges are exposed where the panes meet in the corners. Shining a laser at an angle on the edge causes the glass to act as a prism and reflect the beam back and forth inside the glass down the length of the pane. It's a pretty cool looking effect but I'm not positive the fish agreed.
Plan B is offline   Reply With Quote
Old 02-23-2011, 08:33 PM #12
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Quote:
Originally Posted by Plan B View Post
I was "experimenting" with a similar effect and my fish tank the other day. The glass on the tank is about 1/2 inch thick and the edges are exposed where the panes meet in the corners. Shining a laser at an angle on the edge causes the glass to act as a prism and reflect the beam back and forth inside the glass down the length of the pane. It's a pretty cool looking effect but I'm not positive the fish agreed.
Interesting effect, I wonder if you can get anything similar by filling in a double-pane window with various fluids. Of course I would consider making that a permanent set-up and put the window back into it's frame
Shadetree Engineer is offline   Reply With Quote
Old 02-23-2011, 11:14 PM #13
Bluefan's Avatar
Class 3R Laser
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Bluefan Bluefan is offline
Class 3R Laser
Bluefan's Avatar
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

It's like one bigass fiber, but you need the core refractive index to be bigger, so water surrounded by glass won't work, I think water has an index around 1.3 and glass around 1.5~1.6. The closer the indices, the smaller the acceptance angle.
Bluefan is offline   Reply With Quote
Old 02-24-2011, 07:29 AM #14
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Quote:
Originally Posted by Bluefan View Post
It's like one bigass fiber, but you need the core refractive index to be bigger, so water surrounded by glass won't work, I think water has an index around 1.3 and glass around 1.5~1.6. The closer the indices, the smaller the acceptance angle.
So if it was a sheet of glass surrounded by water, it would work?

Well, I actually had the thought that it might be mineral oil or something other than water. But as I wasn't sure, I only said 'liquid'. But you mentioned the term 'refractive index' and I decided that was the variable I needed for a material, so I looked into it and the most suitable choices are very toxic.

So I'm not really that serious about the window full of water, but this has me wondering about the fishtank full of water.
Shadetree Engineer is offline   Reply With Quote
Old 02-24-2011, 12:02 PM #15
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,442
Rep Power: 19481
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Shine a laser through a hollow tube kind of question

I think its difficult to find any liquid that has a low enough refractive index to make it work well.

One funny thing is doing the exact opposite: As lab demo we used to fill a small tank with toluele, and then submerge glass objects in it. Since the refractive idices are nearly identical, the glass appears to just vanish. Its especially cool to use something like a measuring beaker with a scale on it - that seems to be just in the middle of the liquid and can keep people puzzled for a while.
Benm is online now   Reply With Quote
Old 02-24-2011, 07:38 PM #16
Shadetree Engineer's Avatar
Class 1 Laser
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Shadetree Engineer Shadetree Engineer is offline
Class 1 Laser
Shadetree Engineer's Avatar
 
Join Date: Jan 2011
Posts: 51
Rep Power: 14
Shadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to beholdShadetree Engineer is a splendid one to behold
Default Re: Shine a laser through a hollow tube kind of question

Quote:
Originally Posted by Plan B View Post
I was "experimenting" with a similar effect and my fish tank the other day. The glass on the tank is about 1/2 inch thick and the edges are exposed where the panes meet in the corners. Shining a laser at an angle on the edge causes the glass to act as a prism and reflect the beam back and forth inside the glass down the length of the pane. It's a pretty cool looking effect but I'm not positive the fish agreed.
The laser beam stayed in the glass? I had to re-read your post.
Shadetree Engineer is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:20 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC