MIL-PRF-29580C
so that the illumination is uniform throughout. Interruptions during which the prescribed test
tolerances are not exceeded shall be considered as part of the total test duration. Videotape
records may be substituted wherever photographs are required in the test procedures.
4.5.3.2 Solar radiation. The spectacles shall be placed in a solar simulator (Weatherometer
or equivalent). The total incident flux shall be monitored and recorded throughout the exposure.
At the completion of each exposure cycle, optical density and angular protection (see 4.5.2.1) and
transmittance (see 4.5.2.2) shall be recorded. The exposure test cycle shall be repeated until
either the spectacles fail or the equivalent of 312 days of exposure is reached (estimate based on a
two-year service life with an average of three missions per week). At test completion, the
spectacles shall meet the requirements of lens defects (see 3.4.2.4), optical density and angular
protection (see 3.4.3.1), transmittance (see 3.4.3.2), abrasion resistance (see 3.4.3.6), and impact
resistance (see 3.4.5).
4.5.3.3 Laser saturation. The spectacle lenses shall be spectrally scanned before and after
the laser saturation tests and the results recorded. The lenses shall be exposed to laser energies at
the protective wavelengths starting at an intensity below which any bleaching or damage will
occur. The intensity shall be increased until reversible saturation (temporary bleaching) or
damage to the lenses occurs. The results shall be stated in terms of wavelength and energy
density at which bleaching or damage occurs.
4.5.3.4 High temperature. The test sequence as specified below shall be followed:
Step 1 - Prepare the sample in accordance with 4.5.3.1.
Step 2 - Raise the internal chamber temperature to 38 °C (100 °F). Photograph the sample
after temperature stabilization.
Step 3 - Maintain the internal temperature at 38 °C (100 °F) for 6 hours. Photograph the
sample at the end of 2 hours and at the end of 6 hours.
Step 4 - Raise the internal temperature to 66 °C (151 °F) over a 1 hour time period and
maintain that temperature for an additional 4 hours.
a. Photograph the sample after temperature stabilization.
b. Photograph the sample at the end of 2 hours and at the end of 4 hours.
Step 5 - Lower the internal temperature to 38 °C (100 °F) within a 1 hour time period.
Photograph the sample after temperature stabilization.
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