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Reflections LPM

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firelaser

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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?
 





Photonz

Photonz

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Good Idea firelaser!:beer: ill give this thread some more attention
 
IsaacT

IsaacT

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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.
 
Photonz

Photonz

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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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firelaser

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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.
 
Photonz

Photonz

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im thinking whoever does this testing better have really good OD on their goggles in case accidental direct hits:D
 
Antharak

Antharak

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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.
 
lasersbee

lasersbee

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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.


Jerry
 
Antharak

Antharak

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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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firelaser

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Antharak said:
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
Click to expand...

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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