MIL-DTL-62422D(AT)
shall have chromaticity coordinates (x, y) as specified in 3.5.3 when determined using the CIE
system for color chromaticity coordinates.
4.5.7 Resolution. To determine conformance to 3.5.4, a test pattern shall be constructed
as specified in the resolution test of MIL-PRF-13830. The filter resolution shall be measured as
specified in 4.5.7.2 using the apparatus as specified in 4.5.7.1.
4.5.7.1 Resolution apparatus. The following apparatus shall be used to measure the filter
resolution:
a. A dioptometer with at least 3X magnification.
b. A resolving power chart.
c. A holding fixture for the test set.
4.5.7.2 Resolution measurement. Using the dioptometer, the target as seen at the exit
aperture shall be resolved in each of the four meridians. The test shall be repeated in four
regions of the test unit (see figure 1). The resolution of the test pattern shall conform to 3.5.4.
4.5.8 Filter coating durability measurement. To determine conformance to 3.5.5, two
filters per chamber load shall be tested for coating durability in accordance with MIL-C-48497 in
the order specified below. One filter shall be chosen from the upper (or inner) area of the
coating zone and one filter shall be chosen from the bottom (or outer) area of the coating zone.
Within 15 minutes after performing the humidity test, the optical density of the filters shall be
determined in accordance with 4.5.3.2, except that the optical density shall be measured at one
center point and each edge point as shown on figure 1 for light incidence at 0±1.5 degrees.
a.
Humidity (24 hours)
b.
Optical density
c.
Severe abrasion
d.
Adhesion (fast tape pull)
4.5.9 Surface quality measurement. To determine conformance to 3.5.6.1 and 3.5.6.2,
filters shall be tested for surface quality in accordance with MIL-PRF-13830 for digs and
scratches. Filters shall be evaluated using the surface quality standards for optical components
as specified on Drawing 7641866.
4.5.10 Laser damage resistance. This test shall be conducted on the first article samples
only. To determine conformance to 3.5.7, filters shall be tested at each wavelength, energy
density, and repetition rate specified in table V using the corresponding lasers. The energy
distribution over the area of the laser pulse shall be a gaussian shape and have a full width at half
maximum (FWHM) pulse width of 5-30 nanoseconds. Each test point shown on figure I shall
receive a minimum of ten laser pulses. After exposing all test points, the filter shall be
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