True Performance Never Fears Change

It Defies The Status Quo

**In 2003 Dream's founder, Shane Santi, took aerospace composite technology and optimized it for the extreme thermo and mechanical tolerances that are faced in modern opto-mechanical and electro-optical devices. He recognized that a tailored composite could be made that had ideal attributes desired in optical structures;
****- low mass,
****- low CTE and
****- extreme stiffness.

 
**He quickly realized that standard composite companies had little to no knowledge of optical systems and the extreme requirements that come with them, as well as little interest in working with such a demanding customer. These requirements meant that such optimized parts needed to be designed and fabricated by those who understood how critical it was to the performance of the instrument. Dream designed and custom-built their largest composite oven; 6' deep, 12' wide and 6' high. It can maintain a tight temperature tolerance of +/-1°F, which is roughly one magnitude tighter than normal aerospace composite industry ovens. Dream's resin content is 10-60x more tightly controlled than standard pre-pregs. All due to the incredibly tight tolerances driven by the optical system requirements.
**Other companies have more recently used open-market carbon fiber in one or two components of the opto-mechanical system. These often represent only 5-10% of the weight of the structure, while 90-95% remains traditional metals. At times those metals are high-density and/or high-CTE, low-cost aluminum. Dream has always used its engineered carbon fiber, especially carbon fiber skinned sandwich core, extensively in the structures it produces.

Dream consistently averages 95% carbon fiber and only 5% metals for the weight of the structures in its athermal telescopes. (no optics)
**To this day Dream is the only company in the world that has specialized, develops and fabricates its own advanced composite parts and assemblies specifically to allow the highest performance of demanding modern optical designs. Dream simultaneously has extensive optical design, mechanical engineering and finishing expertise, including lightweight mirrors.
**Given the visual example to the above right, it is not difficult to appreciate that what Dream has created provides industry-leading stiffness and cutting-edge performance, enabling higher performance for today's modern optical designs and their tighter tolerances.

Dream's advanced composite products are also corrosion resistent and have the lowest possible maintenance. Dream's full opto-mechanical systems attain superior mechanical stability and thermal stability by combining Dream's other core technology; zeroDELTA engineered, lightweight mirrors.

By design Dream's in-house technologies produce athermal telescopes.

**Dream's tailored composites offer extreme stiffness and produce an athermal instrument when combined with Dream's zeroDELTA engineered, lightweight mirrors. This makes them ideal for mirror mounts, including for zero-expanion mirror materials. This eliminates the need for complex flexures and makes for a far more stable assembly, maintaining a tighter tolerance in the optical surface(s) and optical alignment performance as both the mirror/system change angle(s) and temperature. Achieving the same extremely high level of performance all year long, year after year.
**The quality of a given optical surface is useless unless the structure supporting it can maintain that quality as the instrument experiences dynamic mechanical and thermal conditions. Dream's products have dealt directly with all of these long-standing hurdles that have been degrading opto-mechanical systems for the past 350 years.

Other Carbon Fiber Parts
biomedical backboard, rigid backboard, carbon fiber board
 
 

The above strut is a prime example of the substantial gains that Dream achieves with its optimized carbon fiber skinned sandwich core parts. The strut is 55.7" long, weighs only 1.85 pounds and is shown in a 3-point bend arrangement under 195 lbs of load.
rocketry, IRAC, Spaceport America Cup, soundingrocket.org
 
 

Dream's carbon fiber is also superb for zero-expansion mirror materials like Astro-Sittal, Clear-Ceram, fused silica, ULE, Zerodur, etc. Click below to see a carbon fiber structure for a 25" Cassegrain that used ULE mirrors.
 

 
 
 
 

Connection points in any opto-mechanical or electro-optical system are often the cause of a loss in stiffness and therefore performance. This page shows the pull-out strength of Dream's stainless steel inserts used within the Dream CFSC parts.


Contact Dream to discuss your project's needs or to learn about our two standard lines of telescopes.


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