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Search: Posts Made By: PDR1
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Forum: Tech Log
18th Feb 2016, 13:30
Replies: 52
Views: 9,270
Posted By PDR1

Just seen this, and my credulity is (I will...

Just seen this, and my credulity is (I will admit) struggling [to recap - we were talking of a claimed hand-held laser attack on an aeroplane at FL360]



Maybe so, but how did YOU determine that...
Forum: Tech Log
18th Feb 2016, 12:53
Replies: 52
Views: 9,270
Posted By PDR1

I'd love to read these comments, but of course I...

I'd love to read these comments, but of course I can't because I'm not even allowed to read that thread.

Are all pilots book-burners by nature, or is it just a few who give the rest a bad name?...
Forum: Tech Log
18th Feb 2016, 12:49
Replies: 52
Views: 9,270
Posted By PDR1

Which is very interesting, but if you read...

Which is very interesting, but if you read BS-EN60825 and the definition of MPE you'll find that the numbers on the graph relate to energy levels that can cause damage at the retina (amongst other...
Forum: Tech Log
17th Feb 2016, 18:15
Replies: 52
Views: 9,270
Posted By PDR1

No, but he'd need to hold it much more steadily...

No, but he'd need to hold it much more steadily and accurately to have *any part* of the beam passing into the eyes.

Which is kinda the point.

PDR
Forum: Tech Log
17th Feb 2016, 18:13
Replies: 52
Views: 9,270
Posted By PDR1

...and then went on to use a far more...

...and then went on to use a far more conservative value of 10degrees/sec for the actual calculations. That number came from standard data we use for human-induced jitter in ground laser designators....
Forum: Tech Log
17th Feb 2016, 18:06
Replies: 52
Views: 9,270
Posted By PDR1

Indeed it is, and while that significantly...

Indeed it is, and while that significantly increases the power density in the beam by a factor of 400 (remembering that the analysis suggested we were 3-6 orders of magnitude below the MPE value) it...
Forum: Tech Log
17th Feb 2016, 17:56
Replies: 52
Views: 9,270
Posted By PDR1

Am I? is that why I explicitly talked about this...

Am I? is that why I explicitly talked about this at the end of the post immediately above this one of yours?

PDR
Forum: Tech Log
17th Feb 2016, 17:50
Replies: 52
Views: 9,270
Posted By PDR1

Well I took my numbers from BS-EN60825 (aka "...

Well I took my numbers from BS-EN60825 (aka " IEC60825"), the recognised standard for laser safety. Specifically the "Maximum Permissible Exposure" (MPE) data it contains, as summarised in this...
Forum: Tech Log
17th Feb 2016, 10:59
Replies: 52
Views: 9,270
Posted By PDR1

Really. And how do handheld lasers behave?...

Really.

And how do handheld lasers behave? Do they have good table manners?

If you were at FL360 and flying straight & level then the source must have been at least 14 miles away, and even on...
Forum: Tech Log
17th Feb 2016, 08:26
Replies: 52
Views: 9,270
Posted By PDR1

Just to caveat this: I am an engineer - not...

Just to caveat this:

I am an engineer - not a doctor and not a magician, so all I will ever talk about is whether there is a risk that received power levels approach or exceed the values that...
Forum: Tech Log
16th Feb 2016, 23:34
Replies: 52
Views: 9,270
Posted By PDR1

Laser Pointers - The Maths

I tried to post some analytical numbers about this in the other thread, but I mixed in some of my conjectures and opinions and it seems they upset people, so my posts were deleted and I was locked...
Showing results 1 to 11 of 11


 
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