MIL-PRF-49384B(CR)
3.5 Performance characteristics.
3.5.1 Effective Focal Length (EFL). The EFL of the Imager in the 7.6 to 11.75 micrometer
spectral region shall be 67.9, ±0.7 millimeters at the nominal flange focal distance (see 3.5.6).
Perform 4.5.1 for acceptance.
3.5.2 f/number. The f/number of the Imager shall be f/1.19 or faster, set by the clear
aperture of the first lens element (see Figure 3). Perform 4.5.2 for acceptance.
3.5.3 Linear distortion. The geometric (linear) distortion of the Imager shall be between 0
to -3 percent at the edge of the field. Perform 4.5.3 for acceptance.
3.5.4 Modulation transfer function (MTF). The MTF of the Imager shall be not less than
the MTF given in Figures 1 and 2, as measured in a flat-field focal plane and parallel to surface A
in Figure 3. Perform 4.5.4 for acceptance.
3.5.5 Relative illumination (RI). The RI of the Imager shall not be less than 60 percent at
the edge of the field, for a field diameter of 20 millimeters at the image plane. Perform 4.5.5 for
acceptance.
3.5.6 Flange focal distance (FD). The FD shall be set to a nominal of 17.71mm, adjustable
± 0.47mm at ambient temperature (see 6.3.2). Perform 4.5.6 for acceptance.
3.5.7 Field of view (FOV). The Imager shall have a FOV sufficient to fill a circular
format with a diameter of 20 mm as measured as part of the relative illumination requirement of
3.5.5. Perform 4.5.7 for acceptance.
3.5.8 Optical transmittance. The optical transmittance of the Imager, measured in the 7.6 -
11.75 micrometer spectral region shall be at least 85% at ambient temperature (see 6.3.2).
Perform 4.5.8 for acceptance.
3.5.9 Deviation. The optical axis of the Imager shall not deviate from 90° by more than
± 0.5°. Perform 4.5.9 for acceptance.
3.6 Environmental conditions.
3.6.1 Temperature shock. The Imager shall not be damaged (6.3.1) by sudden changes in
temperature between -54°C and +71°C (See 4.6.1).
3.6.2 High temperature. The Imager shall not be damaged by storage to +95°C or
operation to +71°C (See 4.6.2).
3.6.3 Low temperature. The Imager shall not be damaged by operation to -54°C or storage
to -62°C (See 4.6.3).
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