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Home > Forums > Military Engineers > Activities > Military engineering Forum

LED for NVIS A

Read More Threads Like This One

8060A (Industrial)

25 Apr 07 17:47

I'm designing a device with two LED annunciators that must be NVIS A compatible. This device is not in a cockpit and does not require intensity matching. Does anyone know which frequency of LED best meets the requirement. A GAP LED is 555nm, which I think is ideal. However, these are dim by todays standards. There are new chemistries in the 528nm range. What I don't know is if this is acceptable for NVIS A.

IRstuff (Aerospace)

25 Apr 07 19:21

4th hit from dogpile search for "nvis a" spectral:
http://www.gamma-sci.com/PDFs/ANVIS.pdf

TTFN

FAQ731-376: Eng-Tips.com Forum Policies

wktaylor (Aeronautics)

1 May 07 13:03

8060A... following may be useful...

SAE ARP4168 Night Vision Goggle (NVG) Compatible Light Sources

Regards, Wil Taylor

FLYHMDS (Aerospace)

27 May 07 16:48

Most, if not all, LEDs emit in the short wave IR (SWIR) band (700-1000nm) in sufficient intensity to make your device non-compliant. NVGs have incredible gain, so even though the manufacturer's spectral plot shows negligible to no emission in the IR, the LED probably emits. Even Blue LEDs will be visible to NVGs due to their IR emission. Few manfacturers will provide LED spectral plots with a log scale. With this type of plot you can see if the LED emits in the SWIR band.

The only sure way to make an LED NVIS compliant is to filter it.

MIL-L-87562 provides the maximum emission requirements for NVIS compatible illumination.

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