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Optical System Shielding
Exoatmospheric Defense | Weather Tracking | Military Intel | Earth Mapping
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Flexial's extendable bellows sunshade is designed for space compression. Satellites, spacecraft and missiles face
the same two problems: weight and space. A sunshade is non-functional bulk that reduces precious spacecraft volume.
Flexial has developed a titanium welded bellows sunshade that stows in less than 1/10th its deployed length. Its
natural spring force makes it self-deploying. It is custom engineered to any size from 0.25 to 24.0 inches in
diameter. It locks permanently and reliably and will resist 10gs lateral load and remain out of the optical LOS.
The locking mechanism cup strap will flex, like a tape measure, for stowing in tight spaces. Flexial has
considerable experience with this proven technology and now offers a greatly improved titanium version with greater
deployed stiffness and higher stowed flexibility.
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Space Compression
The stowed sunshade allows positioning the satellite further into the nose when designed on-axis, or tucks clear
of the rocket wall when transverse-mounted. The cup straps that lock the sunshade when extended are highly flexible
when collapsed to fit very small spaces. They need not be positioned symmetrically to take advantage of available
pockets of space.
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Bellows Sunshade Advantages
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Compact and lightweight Generally comparable for weight with a sintered and machined beryllium sunshade and stows to less than 1/10th its extended length. Can free up far in excess of its own volume through clever design. |
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Self-Energizing Deploys by its own spring force. The bellows negative spring rate becomes stiffer when deployed than stowed. Can remain stowed for years without metal creep for reliable deployment. |
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Self-deploys reliably under extreme conditions of temperature, vibration and shock No sliding or rotating parts or joints, deploys the same as a released spring. Locking cup straps also unfold like released springs to help deployment. Insensitive to vibration, shock or temperature during deployment. |
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Completely solid, hermetic construction Can serve secondary role as hermetic cover for optics when stowed. Completely non-porous bellows with leak rate 1x10-10 std cc/sec helium (used in ultrahigh vacuum systems) will hold high vacuum for decades. |
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No outgassing under all storage conditions Can be degassed prior to installation as in UHV systems. No elastomerics; will not outgas or contribute any type of contaminant to optical mirrors and sensors. |
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Convolutions act as light traps Bellows convolutions act as traps or light baffles for light entering the front of the sunshade at high incidence. Bellows sunshades do not require internal coatings to reduce reflectivity. |
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Highly inert, corrosion resistant, non-toxic Heat treated titanium bellows is resistant to virtually all chemicals and gasses. Unlike beryllium sunshades, titanium is also ultra-low toxicity (used in medical implants). Cup straps are heat treated Inconel 718- extremely high strength and excellent corrosion resistance. |
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