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HeliTorque Forum Index » EMS, SAR & Law Enforcement

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Nvg
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bob
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PostPosted: Wed Jun 18, 2008 6:19 pm    Post subject: Nvg Reply with quote

What kind nvg does ems use light intensifying or ultaviolet light ?
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mastercylinder
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PostPosted: Fri Jun 20, 2008 4:29 am    Post subject: Reply with quote

Bob,

As far as I'm aware ALL NVG intensify visible light and near infrared. I don't think there are any (at least not available on the open market) which use UV. FLIR is also available and from its name it is also looking in the infrared.

Sorry if this isn't as helpful as you'd hoped.

MC
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aviatorjames
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PostPosted: Wed May 06, 2009 5:31 pm    Post subject: Reply with quote

Correct...

NVG (current technology) only amplify visible light
And not the entire visible spectrum either...

We are discovering certain obstruction-light systems using LEDs that are outside the NVG's spectrum!
...visible to the unaided eye and totally invisible under NVG!!

Here's a cool photo I took of our machine through the goggles...

James Harris
Air Methods Corp
Stanford Life Flight




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bob
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PostPosted: Wed May 06, 2009 7:49 pm    Post subject: Reply with quote

Why is NVG better than just turning on the spot light , and using visible light ? Dosn't the NVG veiw get washout by lights on the ground of emergency vehicles ?
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mastercylinder
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PostPosted: Thu May 07, 2009 12:57 am    Post subject: Reply with quote

bob wrote:
Why is NVG better than just turning on the spot light , and using visible light ? Dosn't the NVG veiw get washout by lights on the ground of emergency vehicles ?


If you've got a really tight beam spotlight, like a nightsun, you're better off than a standard searchlight. The searchlight isn't really much good above about 200' AGL as the beam diffuses very quickly. Even with a nightsun, the area of illumination is quite narrow and you don't have the all round visual information that you sometimes need to make a safe approach and landing at night (this is to a remote landing area, not a runway). The NVG allows you to move your head and get visual information on a larger area (sort of a composite photo of the area) so that you can make a safe approach and landing. The NVG also doesn't wreck your night vision the same way as white light does.

Hope this answers your question.

MC
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MightyGem
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PostPosted: Fri Sep 04, 2009 6:11 pm    Post subject: Reply with quote

Why use NVGs?

http://www.youtube.com/watch?v=u-6Vd1gc8AA
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GlassMan
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PostPosted: Fri Sep 04, 2009 10:10 pm    Post subject: Reply with quote

aviatorjames wrote:
[b][color=blue] ... We are discovering certain obstruction-light systems using LEDs that are outside the NVG's spectrum!
...visible to the unaided eye and totally invisible under NVG!! ...


Shocked Oh oh! Now THERE's some good news!


Hi Jim,

RFB
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