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PROJECT OVERVIEW: |
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A
preliminary design and a proof-of-principal prototype are needed for a
window positioning system to be used in a tank-launched projectile
that will deliver an explosive warhead onto an armored target. An
infrared sensor in the projectile requires Non-Uniformity Compensation
(NUC) be performed. The NUC process allows the scaling factor of
individual pixels of the IR detector to be set such that a uniform
image results from a uniform scene. One method for providing a uniform
scene is to blur the scene by temporarily inserting a small optical
window into the optical path and shift the focus point. A device is
needed that can:
- Survive a 10.0-kG
launch acceleration acting normal to the window face.
- Survive 3,300G
lateral balloting, 2,000G set forward acceleration during launch
- Be packaged in a
0.2352" tall by 2.899" diameter cylinder, excluding electronics that can
be located remotely.
- Move a single
crystal germanium lens
(0.040" thick by 0.6" minimum diameter) into, or out of, position in
less than 1 second. "In position" means the window is covering a
photocell array located at the centerline of the cylindrical volume
for the assembly.
- Move the lens under
3-G lateral acceleration during projectile flight
- Require less than 24
Watts at a maximum of 24 Vdc for less than 1 second, and less than 5
Watts continuous if needed.
- Have lowest mass
possible
- Withstand thermal
operating conditions: -32 to +49șC operating, -46 to +63șC storage,
+5 to +40șC Guide To Hit
- Have the capability
of repeated actuation for the purposes of multiple checkout runs for
the system. The final actuation can be a one-shot mechanism, but for
lab use multiple resets will be needed.
- Support 0.352lbm
optics and provide flat mounting
place for same.
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