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Old 10-03-2012, 12:10 PM #1
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Default Sefe IR laser

It's my first post here, so - hello everybody.

I'm working on interactive installation that will allow users to aim and shot to the projection screen using a replica of a gun.
I'd like to use an IR laser hidden in a gun barrel and an IR webcam to detect the point user is aiming at.

So there's a question: are there any IR lasers, that are not hazardous for eyes? It has to be clearly visible from the distance of about 5 meters.


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Old 10-03-2012, 12:37 PM #2
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Default Re: Sefe IR laser

Use only very low power IR lasers like 1-2mW output. The IR webcam must be sensitive to detect the IR dot. Do not use high power IR as they are still invisible and dangerous to the eyes.

Must the dot be IR invisible ? You better use a low power red laser as the convergence is much better and also better visible.
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Old 10-03-2012, 12:43 PM #3
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Default Re: Sefe IR laser

Yes, dot has to be IR - because laser will point at a screen with projection, so I have to use IR to distinguish it from background image.
I have a good IR camera, should work well.

Do you know any store I could buy such a laser?
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Old 10-03-2012, 02:47 PM #4
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Default Re: Sefe IR laser

Get a ~5mW (which are likely to be an actual 1-3mW) like this one and turn down the power. The simplest thing to do would be to remove the driver and just use a high-value current-limit resistor. Start with 1k or so and slowly move down until the camera can see it.
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Old 10-03-2012, 03:30 PM #5
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Default Re: Sefe IR laser

Quote:
Originally Posted by mruce View Post
It's my first post here, so - hello everybody.

I'm working on interactive installation that will allow users to aim and shot to the projection screen using a replica of a gun.
I'd like to use an IR laser hidden in a gun barrel and an IR webcam to detect the point user is aiming at.

So there's a question: are there any IR lasers, that are not hazardous for eyes? It has to be clearly visible from the distance of about 5 meters.
This Laser would be safe to use and would probably
solve your problems... Hopefully the indicated output
powers are accurate.

780nm 5mW Infrared IR Laser/Lazer DOT Diode Module 3VDC | eBay

It is 780nm and outputs between 2.8mW and 3.5mW...

EDIT...

Damn Cyp it looks like we found the same Seller..


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Last edited by lasersbee; 10-03-2012 at 03:33 PM. Reason: Added Info
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Old 10-03-2012, 05:26 PM #6
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Default Re: Sefe IR laser

Great, thank you very much for help.
There's no information about safety class - what does it mean?
Just to make sure - is it completely safe (if I power it with 3V or less)?
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Old 10-16-2012, 08:47 AM #7
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Default Re: Sefe IR laser

Ok - let me rephrase the question: is it possible to buy an IR laser certified for class-1 safety? Where can I find it?
Thanks
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Old 10-18-2012, 10:05 AM #8
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Default Re: Sefe IR laser

It's really important for me - so I'll bump it.
Where can I buy class-1 IR laser?
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Old 10-18-2012, 11:28 AM #9
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Default Re: Sefe IR laser

Instead of bumping the Thread I would suggest trying
a Google search like I just did..

Laser Safety Fact Sheet

"Class I lasers are low powered devices that are considered safe from all potential hazards. Some examples of Class I laser use are: laser printers, CD players, CD ROM devices, geological survey equipment and laboratory analytical equipment. No individual, regardless of exposure conditions to the eyes or skin, would be expected to be injured by a Class I laser. No safety requirements are needed to use Class I laser devices."

http://neurowww.cwru.edu/_media/imag...ety_manual.pdf


"Beam power is less than 0.4uW for visible CW Lasers"


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Last edited by lasersbee; 10-18-2012 at 11:32 AM.
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Old 10-18-2012, 11:39 AM #10
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Default Re: Sefe IR laser

Thank you for reply, lasersbee.
The thing is I want to use it in interactive installation, where safety is very important factor - so I can't get laser from some random device. I need a certified product sold as a Class I IR laser.
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Old 10-18-2012, 11:58 AM #11
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Default Re: Sefe IR laser

Either way... YOU will need a Laser Power Meter that is
accurate at those low powers to test your final product.

You can not rely on the Laser's actual output until YOU
check it. There are too many variables between the
PS and the Laser beam at the aperture.


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Last edited by lasersbee; 10-18-2012 at 11:59 AM.
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Old 10-24-2012, 08:30 AM #12
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Default Re: Sefe IR laser

Build one yourself?

You can find low power 780nm LD's in CD readers every where, hi-fi, car CD players, CDROM drives etc.

heres the thread i did: 780nm from CD Player & night vision
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Old 10-24-2012, 10:53 AM #13
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Default Re: Sefe IR laser

I wonder what the lasing threshold of those Lasers is
since he's looking for an output of ~0.4uW...
Yes that is microWatts....


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Last edited by lasersbee; 10-24-2012 at 10:54 AM.
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Old 10-24-2012, 08:44 PM #14
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Default Re: Sefe IR laser

something tells me that his webcam wont be sensitive to ~0.4uW
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445nm - 15,895mW (15)
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473nm - 110mW (2)
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637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
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445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
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OEM Lasers OD 5+ 190-435nm & 730-1085nm

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