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Old 06-21-2013, 03:28 AM #1
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Default Reflections LPM

after getting lasers i have learned greatly about how different materials have different reflective properties, mirrors, windows, glass, metal, plastic, ect
and thought of an interesting experiment/ safety demonstration.

to shine your laser into these different reflective materials and get Laser power meter readings of the power of these reflections, even test if different colors/wavelengths have different results

i know there are general % numbers out there for standard mirrors, glass ect. but i thought it would be cool to show if you shine your 1000mw blue laser in the mirror and hit your eye you will get 755mw or so damage, a glass window, 180mw,,,, ect

just a thought, i dont have a LPM so i cant do it but maybe someone else can, with a list of the top 5 or 10 most common reflective materials tested...
Mirrors- windows, a few plastics, a few metals,, water, reflection of goggles? ect

thoughts?


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Old 06-21-2013, 03:31 AM #2
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Default Re: Reflections LPM

Good Idea firelaser! ill give this thread some more attention
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Old 06-21-2013, 03:38 AM #3
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Default Re: Reflections LPM

I will see what I can come up with. Thoughts: you should have a somewhat stable laser so that measurements are not fluctuating between the different tests.
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Old 06-21-2013, 03:41 AM #4
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Default Re: Reflections LPM

if you get a chart up with all the percentages of reflected laser light it should get stickied so everyone knows the level of danger each material possesses.
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Old 06-21-2013, 03:42 AM #5
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Default Re: Reflections LPM

true, some lasers can have quite jumpy power,, but if this was able to be tested it could be another Stickies in safety, but i have seen some very stable graphs out there.
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Old 06-21-2013, 03:49 AM #6
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Default Re: Reflections LPM

im thinking whoever does this testing better have really good OD on their goggles in case accidental direct hits
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Old 06-21-2013, 03:57 AM #7
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Default Re: Reflections LPM

Quote:
Originally Posted by Photonz View Post
im thinking whoever does this testing better have really good OD on their goggles in case accidental direct hits
http://jckendall.org/wp-content/uplo...lpapers-2.jpeg
if you know what i mean..
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Last edited by firelaser; 06-21-2013 at 03:57 AM.
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Old 06-21-2013, 03:59 AM #8
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Default Re: Reflections LPM

haha the eagle pair! i was like what the? and then ohhhh!
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Old 06-21-2013, 05:34 AM #9
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Default Re: Reflections LPM

I have OD4+ goggles
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Old 06-21-2013, 10:01 AM #10
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Default Re: Reflections LPM

I just did a quick test with a cheap plastic mirror.
I'll get more involved later when I have a few more mg of caffeine in me.

Laser 445nm 3 mode driver, High- Medium -Low

Medium direct 1.438W............ Bounced off mirror 850mw
Low direct 138mw.......... Bounced off mirror 96mw

Direct measurement laser to LPM 18"
Mirror measurement Laser to mirror 18" Mirror to LPM 10"

I'll do the next set with the distances the same.
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Old 06-21-2013, 11:36 AM #11
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Default Re: Reflections LPM

Would also be a good idea to mention what type
of LPM you use for the reflection tests.

There may also be a problem of getting all or most of
the reflected Laser light onto a sensor when reflecting
off a surface the scatters the beam.

The distance from the reflecting surface to the Sensor
would also be a critical test criteria.


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Old 06-21-2013, 12:14 PM #12
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Default Re: Reflections LPM

LPM is a Blue Fan MK II
As for scatter I'm going to use the sensor with a cover to represent the pupil in the eye to get a good idea of real exposure.
All distances will be the same.
I'm going to do,
Mirror/ plastic
glass plate
chromed piece/ Rod 20mm and 8mm
aluminum foil
clear plastic plate
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Old 06-21-2013, 05:19 PM #13
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Default Re: Reflections LPM

Quote:
Originally Posted by Antharak View Post
LPM is a Blue Fan MK II
As for scatter I'm going to use the sensor with a cover to represent the pupil in the eye to get a good idea of real exposure.
All distances will be the same.
I'm going to do,
Mirror/ plastic
glass plate
chromed piece/ Rod 20mm and 8mm
aluminum foil
clear plastic plate
also try a standard clear window, as i could see this one happening the most. As if you are trying to point out a window in your house or car (for whatever reason) and get reflected.
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1.4W 445nm blue C-6 laser
650mw 532nm Green Laser - CNI PGL-III-C
500mw 405nm violet C-6 laser
500mw 445nm blue lazerer cyber
200mw green 532nm laser laserbtb
200mw ebay focusable red laser
160mw 638nm Fixed Focus Leadlight Chrome (soon)
100mw Power rock 532nm green laser
50mw 405nm violet laser
50mw 532nm laser flashlight
3, 5mw (prob 50mw) fasttech 532nm green laser pens
5mw ? ebay pen lasers
5mw 660nm red laser pen
Red and Green laser projector
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Old 06-21-2013, 10:11 PM #14
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Default Re: Reflections LPM

I have a small piece of window glass I will be using. I can't really point lasers out of my windows, live in the city. Going to see if I can get it all done tonight.
I'm putting this in a new thread so it will be easier to find and can be made into a sticky.
Here is the link to the new thread
Laser reflections measured with LPM
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All you could ever want to know about batteries
www.batteryuniversity.com

Cheap Charger danger
http://laserpointerforums.com/f44/fy...ail-82217.html

Get some safety goggles now
http://laserpointerforums.com/f53/ge...now-75799.html

How healthy is your battery
http://laserpointerforums.com/f67/ho...nce-57576.html

My first build
http://laserpointerforums.com/f51/my...ild-85283.html


Lasers
MSD 303 808nm 256mw/converted 532nm
M who knows 405nm 15mw
Qtech 405nm 95mw with Pmans focus mod
Ebay 405nm 135mw and 12mw pens
405nm Pman special 35mw made from parts he sent me.
Fast Tech 405nm 107mw
Rick Trent 445nm 2.7w Grey host
1st build 450nm PLT450B C3/ YZ-C55 145mw
NDB7675 462nm 1.8 w
515nm 130mw NDG4216
Pman special 532nm 114mw
Ebay 532nm 12mw and 13mw pens
635 ebay pen 5 mw
Qtech 650nm 100mw with Pmans focus mod
SFCR-200 650nm 290mw
Melles Griot P-50 632.8 nm 1mw HeNe
Melles Griot LHR-201-372 632.8 8mw HeNe
405nm BDR-209 800mw custom heatsink and focus by FP
GPT Laser-gard goggles
Noir ARG #60 goggles
Chargers Opus BT-C3100 V2.2 Nitecore Intellicharger i4
LPM Bluefan high range.

Last edited by Antharak; 06-22-2013 at 04:06 AM. Reason: update
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Old 06-22-2013, 04:25 AM #15
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firelaser firelaser is online now
Class 2M Laser
 
Join Date: Dec 2012
Location: Melbourne, Florida
Posts: 542
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firelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud offirelaser has much to be proud of
Default Re: Reflections LPM

the results

Laser reflections measured with LPM
__________________
2.1 W 445nm Sci-FI blue laser
1.4W 445nm blue C-6 laser
650mw 532nm Green Laser - CNI PGL-III-C
500mw 405nm violet C-6 laser
500mw 445nm blue lazerer cyber
200mw green 532nm laser laserbtb
200mw ebay focusable red laser
160mw 638nm Fixed Focus Leadlight Chrome (soon)
100mw Power rock 532nm green laser
50mw 405nm violet laser
50mw 532nm laser flashlight
3, 5mw (prob 50mw) fasttech 532nm green laser pens
5mw ? ebay pen lasers
5mw 660nm red laser pen
Red and Green laser projector
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