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VISUAL FEATURES:
NIGHT VISION GOGGLE COMPATIBLE LIGHTING:
Compatible Lighting: VIVISUN 20/20 display legends, which have Night Vision Goggle (NVG) compatibility, do not cause any interference with night vision goggles when the legends are operated at a specified luminance level that is visible with the naked eye.
Need for Compatible Lighting: Night vision goggles are used by pilots to intensify the brightness of scenes illuminated by starlight to a level where they are clearly visible to the naked eye. Any non-compatible lighting source within the cockpit can interfere with goggle operation. This interference causes degradation in goggle sensitivity, making them incapable of starlight operations.
Elimination of Interference: The VIVISUN 20/20 NVG compatible lighting eliminates veiling glare and halo effects that interfere with goggle operation. The compatible lighting also eliminates the emission of radiant energy, which might be detectable as a cockpit target signature.
NVIS Goggle Compatible: The NVG compatible display lighting is designed specifically to be compatible with NVIS (Night Vision Imaging System) AN/AVS-6 goggles. These goggles use generation III image intensifying tubes and are highly sensitive in the radiant energy wavelength range from 600 nanometers to 930 nanometers, allowing them to be used in starlight operations. The goggle sensitivity is highly restricted below 600 nanometers. The VIVISUN 20/20 NVG compatible lighting restricts the display’s radiant energy output to wavelengths less than 600 nanometers.
Conformance to Specification: The VIVISUN 20/20 NVG compatible lighting conforms to MIL-L-85762A “Lighting, Aircraft, Interior, Night Vision Imaging System (NVIS) Compatible” paragraph 3.10.8 and Table VIII, NVIS green B and NVIS yellow colors and paragraph 3.10.9 and Table IX for Caution and Advisory Lights (NVIS green B) and Warning Signals (NVIS yellow) for spectral radiance.
NVIS Compatible Colors: The NVG compatible lighting is available in two colors, NVIS green B and NVIS yellow. The NVIS green B is within an area bounded by a circle whose center is at u′1= 0.131, v′1= 0.623, with a radius r = 0.057 and the spectral locus on the 1976 UCS diagram. The NVIS yellow is within an area bounded by a circle whose center is at u′1= 0.274, v′1= 0.622, with a radius r = 0.083 and the spectral locus on the 1976 UCS diagram. See Figure 8.
Figure 8
Luminance, Voltage and NVIS Radiance: The NVIS green B color produces a NVIS radiance less than 1.7x10-10 NR units at 0.1 foot-lamberts of intensity (approximately 6 volts for 28 volt lamps and 1.1 volts for 5 volt lamps). The NVIS yellow produces an NVIS radiance between 0.5x10-7 and 1.5x10-7 NR units at 15.0 foot-lamberts of intensity (approximately 13.5 volts for 28 volt lamps and 2.3 volts for 5 volt lamps).
Spectral Distribution: The spectral radiance energy distribution for NVIS green B and NVIS yellow colors are shown in Figure 9.
Figure 9
Relative NVIS Response: The relative NVIS response as defined in MIL-L-85762A is shown in Figure 9.
NVIS Radiance: The NVIS radiance of the NVIS green B and the NVIS yellow colors at 15 foot-lamberts are shown in Figure 10. The integrals of the NVIS green B curve times 1/150 gives the NVIS green B radiance. The integral of the NVIS yellow curve times 1 gives the NVIS yellow radiance.
Figure 10
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