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Old 03-22-2012, 09:04 AM #1
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Default Reliable OD Calculator?

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!


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Old 03-22-2012, 12:03 PM #2
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Default Re: Reliable OD Calculator?

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.
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Old 03-22-2012, 12:21 PM #3
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Default Re: Reliable OD Calculator?

Quote:
Originally Posted by Bluefan View Post
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?
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Old 03-22-2012, 12:29 PM #4
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Default Re: Reliable OD Calculator?

I'd say 4 or higher, higher OD's won't be a problem because the fluorescence gives away where the dot is.
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Old 03-22-2012, 12:33 PM #5
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Default Re: Reliable OD Calculator?

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Originally Posted by Bluefan View Post
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.
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Old 03-22-2012, 05:31 PM #6
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Default Re: Reliable OD Calculator?

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
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Old 03-22-2012, 11:17 PM #7
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Default Re: Reliable OD Calculator?

Quote:
Originally Posted by Bionic-Badger View Post
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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