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Figure 13: Spectral response of Gen 3 NVIS with Class A and Class B minus-blue filters per MIL-L-85762A.
Class A yellow, however, presents a dilemma. True yellow color is a broad band emission extending from the green to the red. As a result, the desired color band is right against the steeply rising Class A NVIS response curve (figure 13). Any energy in the redder wavelengths carries an exponentially increasing NR penalty. The only solution compliant with MIL-L-85762A is to limit emissions to the green side of the yellow band.
Korry's testing and analytical capabilities and our production control processes allow us to optimize filter performance in the few critical nanometers right next to the NVIS response curve. This makes Korry's Class A yellow as yellow as possible.
The same design and production dilemma holds for Class B red, with the added difficulty that the photopic response to red is lower than to green, as shown in figure 14. The means approximately 50 percent more light output is required in the red band to meet luminance and contrast requirements. Again, the only acceptable solution per MIL-L-85762A is to hold the red to the orange side of the band. As with Class A yellow, Korry has developed filters that optimize red transmission close to the cut-on wavelengths of the NVIS response. We provide the truest red to meet MIL-L-85762A.
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