Old 05-14-2009, 07:17 PM #17
Class 1M Laser
 
Join Date: Apr 2009
Location: Fargo, ND
Posts: 159
Rep Power: 9
bschott is on a distinguished road
bschott bschott is offline
Class 1M Laser
 
Join Date: Apr 2009
Location: Fargo, ND
Posts: 159
Rep Power: 9
bschott is on a distinguished road
Default

Quote:
Originally Posted by lordoflasers View Post
I love how in CSI they use a red laser pointer on a tripod to animate bullet trajectory and their lasers bounce off of every thing, including a yellow painted peice of cement.

And of course in the movie Resident Evil when the blue laser cuts that guy into cubes.
Our local yokles (Fargo Police) have a crime lab team that uses red lasers to animate bullet trajectory. Don't see them around often since we have like 1 shooting every 10 years or so, but a few years back there was a love triangle (wife seperated from husband and started sleeping with a coworker, husband snaps and kills her and her boyfriend, then himself, with a shotgun...very very very shocking thing for this redneck part of the woods) and the local CSI team was there to investigate. I happened to work across the street at the time and watched them set up their lasers. Pretty cool to see red laser beams out of real lasers with no fog. I didn't think laser light was visible unless there was a fog or some particles in the air for the beam to reflect on (I didn't realize higher power lasers will show a beam without fog).

At least there are a few people out there that are trying to educate those of us who are/were part of the "unwashed masses" as it was.

http://www.intuitor.com/moviephysics/mpmain.html#lasers


bschott is offline   Reply With Quote


















Old 05-14-2009, 07:23 PM #18
GooeyGus's Avatar
Class 3B Laser
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 2701
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
GooeyGus GooeyGus is offline
Class 3B Laser
GooeyGus's Avatar
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 2701
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
Default

"THAT would be like lasing a stick of DYNAMITE!!!"

Real genius...
GooeyGus is offline   Reply With Quote
Old 05-14-2009, 07:28 PM #19
Class 1M Laser
 
Join Date: Apr 2009
Location: Fargo, ND
Posts: 159
Rep Power: 9
bschott is on a distinguished road
bschott bschott is offline
Class 1M Laser
 
Join Date: Apr 2009
Location: Fargo, ND
Posts: 159
Rep Power: 9
bschott is on a distinguished road
Default

Quote:
Originally Posted by Benm View Post
Movies and lasers... always funny isnt it?

I've always found it surprising that holywood moviemakers think that grids of laser beams are commonly used in expensive security systems, but that they are always built such that you can pass between the gaps with enough acrobatics.

As an extra the beams are sometimes invisible (which would make sense), but can be made visible using only some special glasses, no smoke or anything else.

Another holywood thing are sniper rifle scopes that are the size of a ballpoint, yet produce 5 mm wide spots even a mile away.
Someone else was looking at that 'insultingly stupid movie science' page. You pretty much went down the list in the same order to :P

Nah, nothing bad about that. Good that you pointed it out.
bschott is offline   Reply With Quote
Old 05-14-2009, 08:06 PM #20
Mr_Lazo's Avatar
Class 1 Laser
 
Join Date: May 2009
Location: Miami, FL
Posts: 60
Rep Power: 9
Mr_Lazo is on a distinguished road
Mr_Lazo Mr_Lazo is offline
Class 1 Laser
Mr_Lazo's Avatar
 
Join Date: May 2009
Location: Miami, FL
Posts: 60
Rep Power: 9
Mr_Lazo is on a distinguished road
Default

I, too, used to believe in the wole never-diverging, dot-would-still-be-the-same-size-even-a-mile-away thing. The first time some friends and I were screwing around with lasers at long distances and I saw, first hand, significant beam divergence, I thought my buddy had a cheap laser.

Hollywood lasers are great, though! Anyone remember that scene from Lethal Weapon 4 where (a not yet uncool-crazy) Mel Gibson uses the laser sight on his Beretta to plot the ricochet course of a bullet off of a rusty metal bulkhead and shoots a guy hiding behind some stuff?
__________________

LASER screwdriver. Who'd use sonic? - The Master [Dr. Who]

Last edited by Mr_Lazo; 05-14-2009 at 08:08 PM. Reason: sp
Mr_Lazo is offline   Reply With Quote
Old 05-22-2009, 12:17 AM #21
Junior Member
 
Join Date: Apr 2009
Posts: 9
Rep Power: 0
Autarchus is on a distinguished road
Autarchus Autarchus is offline
Junior Member
 
Join Date: Apr 2009
Posts: 9
Rep Power: 0
Autarchus is on a distinguished road
Default

Quote:
Originally Posted by Mr_Lazo View Post
Hollywood lasers are great, though! Anyone remember that scene from Lethal Weapon 4 where (a not yet uncool-crazy) Mel Gibson uses the laser sight on his Beretta to plot the ricochet course of a bullet off of a rusty metal bulkhead and shoots a guy hiding behind some stuff?
I remember that. Good thing that movie came out when I was in elementary school, because after high school physics, movies became (to me) full-retard stupid. A bullet impact isn't elastic, so it would not follow the path of the beam. And any SF soldier will tell you that bullets follow walls.
Autarchus is offline   Reply With Quote
Old 05-22-2009, 12:38 AM #22
Member
 
Join Date: Sep 2008
Posts: 46
Rep Power: 0
Deadly is on a distinguished road
Deadly Deadly is offline
Member
 
Join Date: Sep 2008
Posts: 46
Rep Power: 0
Deadly is on a distinguished road
Default

What does that mean-bullets follow walls?
Deadly is offline   Reply With Quote
Old 05-22-2009, 12:59 AM #23
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 674
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 674
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default

Soon after getting into this hobby I went to the school my Dad works at, (as a workshop tech. He used to teach but the tech. position is a lot less hassle!), to pick him up. As they have a small CO2 cutting table I was having a look and one of the teachers, (head of year, as it happens), piped up with, "Lasers work better in high wind.". I'm pretty certain wind velocity has very little to do with efficiency! I think he got this idea from the US 747 that was converted to knock down ICBMs.

I didn't have the heart to dispell this myth in front of his class. I might have pointed out that the cutting table should have a high pressure blower to improve cutting!

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 05-22-2009, 01:04 AM #24
icecruncher's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Posts: 1,216
Rep Power: 35253
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
icecruncher icecruncher is offline
Class 3R Laser
icecruncher's Avatar
 
Join Date: Jan 2008
Posts: 1,216
Rep Power: 35253
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
Default

You can't tell me no one posted "lightsaber" from Star Wars yet. I'm amazed.

There is grade A material!

A self terminating light weapon aka "LASER", with phenomenal power that collapses into a pocket device and can deflect incoming objects. Available in Red, Blue or Green.

Hollywood at its finest!

At least in "Real Genius" the laser continues through objects.
icecruncher is offline   Reply With Quote
Old 05-22-2009, 01:31 AM #25
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 674
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 674
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default

Hmmm.....

Don't know how I missed that one.... lol. What about the Death Star and it's miracle beam combiners?

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 05-22-2009, 01:50 AM #26
sbdwag's Avatar
Class 1M Laser
 
Join Date: May 2009
Location: Southern Indiana
Posts: 135
Rep Power: 11
sbdwag has a spectacular aura aboutsbdwag has a spectacular aura aboutsbdwag has a spectacular aura about
sbdwag sbdwag is offline
Class 1M Laser
sbdwag's Avatar
 
Join Date: May 2009
Location: Southern Indiana
Posts: 135
Rep Power: 11
sbdwag has a spectacular aura aboutsbdwag has a spectacular aura aboutsbdwag has a spectacular aura about
Default

Though I am 54 years old I always thought until recently that lasers over 5mw were illegal in the USA? I thought they were similar to a class three weapon and It was a federal offence to possess one without a license. I showed a 50mw greeny to some friends at work and they thought they were illegal also.

Regards
sbdwag
sbdwag is offline   Reply With Quote
Old 05-22-2009, 02:40 AM #27
Class 2M Laser
 
Join Date: May 2009
Posts: 962
Rep Power: 48115
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
LSRFAQ LSRFAQ is offline
Class 2M Laser
 
Join Date: May 2009
Posts: 962
Rep Power: 48115
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
Default

public demonstrations of lasers require a variance, basic rule is over 5 mW, you need a projector with a accession number and a variance. If you go over to the CDRH website at FDA.GOV and search for "demonstration lasers"

Steve
LSRFAQ is offline   Reply With Quote
Old 05-22-2009, 02:47 AM #28
game-genie's Avatar
Class 1M Laser
 
Join Date: Dec 2008
Location: Europe - Austria
Posts: 199
Rep Power: 10
game-genie is on a distinguished road
Send a message via ICQ to game-genie Send a message via Skype™ to game-genie
game-genie game-genie is offline
Class 1M Laser
game-genie's Avatar
 
Join Date: Dec 2008
Location: Europe - Austria
Posts: 199
Rep Power: 10
game-genie is on a distinguished road
Send a message via ICQ to game-genie Send a message via Skype™ to game-genie
Default

I saw that movie where these special forces were rescuring a plane with terrorists and a bomb on it. One of the guys had a Laser with him and he melted the isolation of a cable with it ^^
I know thats the opposite of the topic , because my dilda is able to do that , but I think its also worth to mention some true hollywood myths :-]

game-genie
game-genie is offline   Reply With Quote
Old 05-22-2009, 03:55 AM #29
sbdwag's Avatar
Class 1M Laser
 
Join Date: May 2009
Location: Southern Indiana
Posts: 135
Rep Power: 11
sbdwag has a spectacular aura aboutsbdwag has a spectacular aura aboutsbdwag has a spectacular aura about
sbdwag sbdwag is offline
Class 1M Laser
sbdwag's Avatar
 
Join Date: May 2009
Location: Southern Indiana
Posts: 135
Rep Power: 11
sbdwag has a spectacular aura aboutsbdwag has a spectacular aura aboutsbdwag has a spectacular aura about
Default

Quote:
Originally Posted by LSRFAQ View Post
public demonstrations of lasers require a variance, basic rule is over 5 mW, you need a projector with a accession number and a variance. If you go over to the CDRH website at FDA.GOV and search for "demonstration lasers"

Steve
I searched the FDA site. And all I could find was regulations concerning manufactures of demonstration lasers and Companys putting on Laser light shows.

Im not sure that showing my laser to two of my close friends at work qualifys as a public laser show demonstration


Regards
sbdwag
sbdwag is offline   Reply With Quote
Old 05-22-2009, 04:54 AM #30
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 16,861
Rep Power: 1100228
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 16,861
Rep Power: 1100228
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default

You can own a >5mW laser pointer but you can not Sell a >5mW laser pointer to
or in the USA if the FDA laser safety regulations are not applied.... IIRC

Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is offline   Reply With Quote
Old 05-22-2009, 08:38 AM #31
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
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 offline
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
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

Quote:
Originally Posted by game-genie View Post
I saw that movie where these special forces were rescuring a plane with terrorists and a bomb on it. One of the guys had a Laser with him and he melted the isolation of a cable with it ^^
That's a funny new category: laser uses that were mythical at the time the movie was made, but have now come true. Perhaps we can find some old movies where someone started a campfire (or something like that) using a laser pointer.
Benm is offline   Reply With Quote
Old 05-23-2009, 06:49 PM #32
Junior Member
 
Join Date: Apr 2009
Posts: 9
Rep Power: 0
Autarchus is on a distinguished road
Autarchus Autarchus is offline
Junior Member
 
Join Date: Apr 2009
Posts: 9
Rep Power: 0
Autarchus is on a distinguished road
Default

Quote:
Originally Posted by ;
What does that mean-bullets follow walls?
When an impact is totally elastic, the projectile will bounce off the impact surface at an angle equal to its incidence. So say the ideal AK-47 bullet hits the ideal concrete wall at 2100 fps and at an angle 45 degrees off the normal - it will ricochet at an angle 45 degrees off the normal and 45 degrees off the plane of the wall, going the same speed of 2100 fps, because in an elastic collision kinetic energy is CONSERVED.

But since bullets are made mostly of soft lead, the impact is very INELASTIC. KE is not conserved. The plastic deformation at the impact and fragmentation of the wall will absorb the energy of the bullet and convert it to sound, heat, breaking molecular bonds, etc..... Thus the angle of deflection will be much LESS than the angle of incidence. The perfect ricochet that is travelling at 2100 fps 45 degrees off the plane of the wall is now going 1300 fps but only 10 degrees off the plane of the wall. Shallower angles of incidence will follow the wall even more closely.

So now when you read Blackhawk Down you'll know exactly why the Delta soldier told the rangers to get out in the street and not to hunker down next to the wall

Light reflections are always of the same angle out as in. So Mel's 9mm bullet would have been far off target after even the first bounce.
Autarchus 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

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 09:55 PM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC