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INDUSTRIAL ELECTRONICS For spatial orientation, each satellite


typically has two-star trackers, a component of which is a high stability imaging lens that an optics supplier designs and develops. In earth imaging, custom telescopes need


to be designed for panchromatic, multi- spectral and hyperspectral imaging, with apertures ranging from 100mm to 800mm. Fabricating mirrors in the 300-800mm range and assembling and testing large telescopes is a very specialised capability that it typically contracted out by the satellite maker to one of the few companies that possess these capabilities. When looking at commercial space


optics it is important that the optics manufacturer works closely with the customer’s engineering team to develop specifications that maximise payload performance value with a cost-effective commercial optics supply chain. This requires a focus on minimising the use of exotic materials and using aspherical surfaces sparingly. Wherever possible, known design, fabrication, and assembly techniques should be employed to limit the risk of failure in orbit. New designs that produce small improvements - or rebalancing of trade-offs - are implemented incrementally through frequent launches, to discover what works in orbit versus investing in expensive ground-based simulations and qualification testing. In a conventional satellite system, the key


goal is to maximise performance. In commercial space systems, the business goal is to deliver performance value that significantly exceeds the cost. Space is a challenging environment. It


requires low out-gassing, radiation resistance, a wide thermal range, magnetic interference limits, and the ability to resist high launch loads. All of this


restricts the designer’s options for material selection. For large constellations, material selection is limited even more as the optical components must often be 100% demisable, meaning they must burn up during re-entry. A further design challenge is the cost


sensitivity to size and weight, which limits the trade space for the designer. Compact designs often give up performance in other dimensions and/or require more sophisticated and expensive components, and high specific stiffness materials that might be used to save weight are typically more expensive. This creates a narrow design window, which requires out-of-the- box thinking and innovation to find the best balance of trade-offs.


The solution Zygo’s fundamental approach when addressing such issues is to apply novel twists to classic designs. For example, when looking at an optical design, Zygo’s team looks for ways to maximise the effectiveness of aberration correction of each element. They also look to reduce the lens count (particularly aspheric lenses), and employ spherical and aspherical components that are compatible with commercial fabrication techniques suitable for volume production. From the perspective of opto-mechanical


design, simplifying the supporting structures is the main goal, with careful attention paid to how components will interact under thermal expansion to minimise the thermal sensitivity. We minimise the use of exotic materials but make exceptions when we discover high- leverage use cases, such as using carbon fibre composites to tune thermal expansion. Fewer (and simpler) lenses and simplified structures naturally lead to a reduction in size, weight, and cost.


Commercial space optics must be able to


survive launch, and then must, of course, perform well in the exacting environment of space. ZYGO can produce robust and highly stable optics that are able to withstand launch loads and maintain high performance in orbit. To overcome the challenge of the dynamic thermal environment typical of low earth orbit, the company has designed telescopes that are athermal over a broad temperature range and are tolerant of thermal gradients. To deal with the high vacuum and ionizing radiation environment, the company has the depth of expertise to select the right glass, structural materials, and design approach to meet the lifetime goals of the satellite. All of this can be achieved on a commercial cost basis and a schedule that is measured in months, not years.


The future


As constellations get larger, the commercial space industry is headed towards increasing scale and increasing performance while lowering costs. Because of this, it is vital that commercial space optics manufacturers work closely with their customers, both parties continuing to evolve designs for a lower cost at higher performance levels including design attention to survivability and demisability. Today, the interest in hyperspectral earth imaging telescope systems is high, and Zygo is looking at designs to make these systems more compact and higher performance, including the use of freeform components. To meet the demands of large constellations, the company is investing in technology to increase capacity and improve throughput in its aspheric and freeform large mirror production facilities.


Zygo www.zygo.com


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