MIL-PRF-49316A(CR)
3.5.5 Collimator lenses. The collimator lenses used in the Test Set to project the test
pattern shall be compatible with the ANVIS and NVG Objective lenses as specified herein.
3.5.5.1 Equivalent focal length (EFL). The EFL of the collimator lens shall be
66mm, ± 1mm.
3.5.5.2 Field of view (FOV). The target format covered by the Test Set collimator lens
shall be sufficient to present a minimum 40 degree FOV to the ANVIS or NVG.
3.5.5.3 f/number. The f/number of the collimator lens shall be f/2.9 or less.
3.5.5.4 Relative illumination (RI). The RI shall be equal to or greater than 80 percent
with a 23mm stop placed 11mm before the first collimator element as seen by the user over the
calculated semifield angle subtended by the target format. The relative illumination shall beequal
to or greater than 55 percent at 20 degrees semi-field angle for the same conditions as stated
above.
3.5.5.5 Modulation transfer function (MTF). The collimator lens shall have on-axis MTF
performance on-axis and at semi-field angles of 3.5 degrees and 7 degrees for both radial and
tangentil orientations as listed in Table II over the spectral region defined in Figure 1 with a
23mm stop placed in front of the lens.
TABLE II. Test Set Collimator Lens MTF.
3.5 degrees
7 degrees
1p/mm
On-axis
Radial
Tangential
Radial
Tangential
0
100
100
100
100
100
5
75
75
75
71
63
10
68
65
63
46
35
15
63
58
50
14
27
20
57
48
37
8
20
3.5.5.6 Lens coatings. Lens coatings shall be optimized to match the spectral
characteristics of the light source (see 3.5.6).
3.5.6 Light source. The light source shall be a Light Emitting Diode (LED) with a peak
output at 820 nanometers ± 25 nanometers (see Figure 1).
3.5.7 Simulated aircraft power. The Test Set shall provide 3.8 Vdc at +0.2/-0.4 Vdc
150 mA for mating to the ANVIS power pack.
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