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Old 24 September 2013, 07:11   #131
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How about this?

Won't they stun the pilot/captain whose attention I'm trying to get?

No. When the fan of light crosses your target's vision it will appear as a brilliant flash in the distance and will in no way impair their night vision.

Comparison of cockpit illumination power densities of Rescue Laser Flareģ
emergency signaling device vs. typical laser pointer

Letís compare the amount of laser light power which illuminates an aircraft cockpit from the Rescue Laser to that of a typical laser pointer, at a common signaling distance of 1.5 miles. The laser power level illuminating the cockpit and hitting the pilotís eye from the Rescue Laser is about one trillionth of a watt. This power level is very low because the Rescue Laser begins with a very small amount of laser light and then creates a very long 2 dimensional fan (line) of light further reducing the power density of the light. This level can be easily detected, but will not obscure pilot vision in any way.

However, because the light from the laser pointer remains in a relatively small one-dimensional pencil thin beam, the laser beam spot size at the aircraft is about 240CM (8 ft) in diameter. Because all of this light is concentrated in a relatively small spot, rather than spread out in a long line like the Rescue Laser, the power density impinging on the pilotís eye is about 1,000 times greater from the laser pointer, at this distance.

Therefore, although the signaling capability of the Rescue Laser emergency rescue and signaling device remains effective for signaling SAR aircraft, the power levels (brightness) of the Rescue Laser is reduced by one thousand times, this is a level where visual flight acuity is not affected.


Supporting Analysis:

Rescue Laser Flare ģ
7mW
5 degree fan angle (87 mrad)
1mrad narrow axis divergence angle
1.5 miles = 2,414 meters
Area of laser line at 2,414 meters = 5.07 Million cm2
Watts/cm2 = .007 / 5,070,000 cm2 = 1.30 x 10-9 W/cm2 = 0.0000000014 W/cm2

Typical Laser Pointer
5mW
1mrad divergence angle
1.5 miles = 2,414 meters
Area of spot at 2,414 meters = 45,745 cm2
Watts/cm2 = .005 / 45,745 cm2 = 1.1 x 10-7 W/cm2 = 0.0000001 W/cm2

The laser light power density from the laser pointer is 1,000 times higher than that from the Laser Flare, when both measured at 1.5 miles.
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Old 24 September 2013, 07:15   #132
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Originally Posted by miccheck1516 View Post
Im aware of helimed choppers being above someone having a heart attack, getting flashed by a laser (not just a red light), and returning home. The casualty died. Wether or not they died because the paramedic onboard couldnt get to the casualty is somethin we will never.
Im aware that some pilots need to have eyes tested after getting flashed by lasers etc)
I'm pretty sure that case was a laser pointer of illegal strength....and the outcome was the guy would have died anyway. Pilots have to have eye tests/medicals by approved opticians/ doctors anyway....

AJ can still see...well he saw that big yellow bouy in the fog!!!
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Old 24 September 2013, 07:16   #133
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Thanks spr im coming round to the idea. Seems there are calculations that can be done to work out if flash blindness is an issue. Would be interesting to see some of those
And the Marine Industry breaths a sigh of relief.

It's just a thought, miccheck1516, but perhaps you could kick this one upstairs to one of those experts on the higher pay-grade that you have on tap, see what they make of it all? Then you could report back here and put us all out of our misery. At least then we'd know if the product had your imprimatur and we wouldn't have to endure seeing poor SPR defend his product against potentially nonexistent issues.
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Old 24 September 2013, 07:19   #134
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This is the Instruction's that was approved by the Military Laser Safety Committee (MSLC)- it has safe working distances as stated by the DSTL (defence Science and Tech. Lab.) That also matches with the USA Miltary Testing Report.

Scott
Attached Files
File Type: pdf Rescue_Light_Handout.pdf (124.5 KB, 49 views)
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Old 24 September 2013, 07:45   #135
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Originally Posted by miccheck1516 View Post
Was on real rescues a few weeks ago.

Thanks spr im coming round to the idea. Seems there are calculations that can be done to work out if flash blindness is an issue. Would be interesting to see some of those
I really do think we can trust that if these are being trialled and used, and referred to by the MCA for the UK, there is not an issue of blindness here.

Look at how many lasers are used in nightclubs and outdoor events that shine right down onto the crowd.

While I'm the first to point out that these are complementary and not a replacement for all pyro flares, I think it unfair with no factual basis to try and suggest these offer some sort of risk to SAR crews.

If there were any such concerns they would have been stated for sure , eg here:

Newsroom - Press Releases

Or for a local to me illustration of the difference:

BBC News - Laser shone at rescue helicopter pilot in Orkney

Steve
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Old 24 September 2013, 08:24   #136
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Originally Posted by SPR View Post
This is the Instruction's that was approved by the Military Laser Safety Committee (MSLC)- it has safe working distances as stated by the DSTL (defence Science and Tech. Lab.) That also matches with the USA Miltary Testing Report.

Scott
SPR I know I am a week late but was well impressed by the build and quality when I saw PeterM's new laser will contact you now to place my order.

Alex
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Old 24 September 2013, 09:38   #137
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I'm pretty sure that case was a laser pointer of illegal strength....and the outcome was the guy would have died anyway. Pilots have to have eye tests/medicals by approved opticians/ doctors anyway....

AJ can still see...well he saw that big yellow bouy in the fog!!!
Ahh right, so assuming miccy is in complete possession of the facts, which as a "professional" we can assume he is, he was being disingenuous/ trolling. Is it me or does every thread that he gets involved in, end up with him looking a bigger terwat than he was when he started
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Old 24 September 2013, 10:14   #138
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SPR - I too am very impressed with the quality and am glad I now have it as an addition to my safety kit. The SOLAS tape you included is a nice wee bonus

Great the way you have responded to ill-founded concerns.
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Old 24 September 2013, 13:06   #139
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Not sure how you can be sure he would have died anyway, it certainly wasnt the impression given by the program.

I dont think, given the fact that people have been prosecuted, that asking about shining a laser at a helo is ill founded, but hey its your opinion and I can respect that.
I appreciate spr taking the time to answer my queries, and infact answering extremely well.
Sorry pikey, the thread isnt about me so ill leave you to calling people names on the internet, big lad!
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Old 24 September 2013, 16:00   #140
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I know because I actually remember it...and at the investigation to the whole thing it was found the attendance of the helicopter and transfer etc would in expert opinion not have led to a differing outcome.
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