MIL-PRF-49170B(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 67.8, ±0.7 millimeters as defined by ANSI PH 3.35, paragraph 4.
3.5.2 f/number. The f/number of the imager shall be f/1.6 or faster, set by the clear
aperture of the first lens element (see Figure 3), as defined by ANSI PH 3.29, paragraph 2.6.
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.
3.5.4 Modulation transfer function (MTF). The MTF of the imager shall not be less than
the MTF given in Figure 1 as measured in a flat-field focal plane and parallel to surface A in
Figure 2. Perform 4.5.4 for acceptance.
3.5.5 Relative Illumination (RI). The RI of the imager at f/2.0 shall not be less than 60
percent at the edge of the field, for a field diameter of 6.5 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 50.0, ±0.6 mm at
ambient temperature (see 6.4.2). 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 6.5 mm as measured as part of the relative illumination requirement. .
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 6.4.2).
Perform 4.5.8 for acceptance.
3.5.9 Deviation. The optical axis of the imager shall not deviate from 90.0 degrees by
more than +/- 0.5 degree. Perform 4.5.9 for acceptance.
3.6 Environmental conditions.
3.6.1 Temperature shock. The imager shall not be damaged (see 6.4.1) by sudden changes
in temperature between -54°C and +71°C.
3.6.2 High temperature. The imager shall not be damaged by storage to +95°C or
operation to +71°C.
3.6.3 Low temperature. The imager shall not be damaged by operation to -54°C or storage
to -62°C.
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