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ArcticMyst Security by Avery

Reliable OD Calculator?

Joined
Jan 27, 2012
Messages
202
Points
18
Hello,
I have been looking around for a relible OD calculator, however I have found that calculators differ for example the calculator on this page is much different to the calculator here.

Does anybody know which one gives the right answer or any other calculator that gives a proper answer?

I'd probably go with the second calculator to be safe, but I just want to know in general!

Thanks!
 





Joined
Aug 15, 2009
Messages
1,443
Points
48
I always take this: log(P_laser/100uW) as starting point, but higher is usually not a problem. 532nm and shorter has enough flourescence that any high enough OD already works.
 
Joined
Jan 27, 2012
Messages
202
Points
18
I always take this: log(P_laser/100uW) as starting point, but higher is usually not a problem. 532nm and shorter has enough flourescence that any high enough OD already works.

So what would you say a 1W 445nm laser would need regarding the OD level?
 
Joined
Aug 15, 2009
Messages
1,443
Points
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I'd say 4 or higher, higher OD's won't be a problem because the fluorescence gives away where the dot is.
 
Joined
Jan 27, 2012
Messages
202
Points
18
I'd say 4 or higher, higher OD's won't be a problem because the fluorescence gives away where the dot is.

Okay thanks. The goggles that I have coming are only OD 2.5 at 445nm and OD 2.7 at 532nm...they are Radiantshades.
 
Joined
Oct 26, 2007
Messages
5,438
Points
83
Whenever I need to see if OD is sufficient, I just type in "Input * 10^-OD" into google and see if the result is it is below 0.005. For example, if I want to see if OD 3.7 would protect against 1.5W:

1.5 * 10^-3.7 = 0.000299289347 --> which is less than 0.005 = protected
 
Joined
Jan 27, 2012
Messages
202
Points
18
Whenever I need to see if OD is sufficient, I just type in "Input * 10^-OD" into google and see if the result is it is below 0.005. For example, if I want to see if OD 3.7 would protect against 1.5W:

1.5 * 10^-3.7 = 0.000299289347 --> which is less than 0.005 = protected

Thanks heaps!
 




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