would be lost in the infrared glow of the mirror. Webb's polished mirrors are tested at cryogenic temperatures at a facility at NASA Marshall. In 1857, Karl August von Steinheil and Léon Foucault (yes, that Léon Foucault) developed the process to deposit an optical quality silver coating on glass telescope mirrors. The flight telescope structure sits in the assembly stand at NASA Goddard, ready for mirror assembly. Optiques Fullum offers telescope owners assistance in keeping their telescopes in optimal conditions through a range of basic maintenance services: During the general check-up, our team of experienced technicians will verify: If during the inspection, it appears that some surfaces or components need repair or a renewed coating, we will contact the owner and discuss the different options that are possible, Contact us for more information or to receive a quote. This also allows for a wider field of view. The Webb Telescope team also decided to build the mirror in segments on a structure which folds up, like the leaves of a drop-leaf table, so that it can fit into a rocket. As a manufacturer of custom optical mirrors, Optiques Fullum can refigure the primary mirror for a better image. Since many materials change shape when they change temperature, a test team from Ball Aerospace worked together with NASA engineers at Marshall’s X-ray and Cryogenic Facility (XRCF) to cool the mirror segments down to the temperature Webb will expericence in deep space, -400 degrees Farenheit (-240 degrees Celsius). A, B, or C denotes which of the three mirror prescriptions a segment is. The tertiary removes the resulting astigmatism and also flattens the focal plane. The photos show the flight version of every mirror on the telescope! What's even more amazing is that the engineers and scientists working on the Webb telescope literally had to invent how to do this. is called O-30 and is a fine powder. Each of the 18 hexagonal-shaped mirror segments is 1.32 meters (4.3 feet) in diameter, flat to flat. High filling factor means the segments fit together without gaps. A polished engineering design unit mirror at SSG/Tinsley. Change ), You are commenting using your Facebook account. Actuators, or tiny mechanical motors, provide the answer to achieving a single perfect focus. ), Pictured is the back of the mirror blank, which is carved out in this pattern to make the mirror segment light, yet maintain its integrity. Flight mirror canisters stored at Goddard. Indeed, the coating on my very first reflector telescope looks absolutely perfect in spite of being more than 30 years old. The Webb Telescope team decided to make the mirror segments from beryllium, which is both strong and light. 2020. If the Hubble Space Telescope's (A full primary mirror segment assembly including its actuator is about 40 kg. Technicians will remove the old coating using techniques and solutions that will not affect the underlying glass or optical figure. The beryllium to make Webb's mirror was mined in Utah and purified at Brush to build a full-size, 6.5-meter mirror. The powder was placed into a stainless SSG/Tinsley started by grinding down the surface of each mirror close to its final shape. This short video shows part of the mirror polishing process. company that is leading the effort to build Webb) selected a beryllium mirror, This movie shows the mirror blanks being made at Brush Wellman and shaped at Axsys. Posted by gfbrandenburg in astronomy, Optics, Safety, science, Telescope Making, Uncategorized. Webb sitting inside Chamber A after it completed cryogenic testing. All our mirror coatings are guaranteed for one year. of temperatures. Once a mirror segment's final shape is corrected for any imaging effects due to cold temperatures, and polishing is complete, a thin coating of gold is applied. Change ), You are commenting using your Google account. the light from these distant galaxies. Because warm objects give off infrared light, or heat, if Webb's mirror was the same temperature By the end of 2013, all the flight primary mirror segments, as well as the secondary and tertiary mirrors would be at Goddard. the resulting chunk of beryllium was cut in half to make two mirror blanks to research new ways to build mirrors for telescopes. Credit: ASU/NASA. One further challenge is to keep Webb's mirror cold. Finally, a roughly circular overall mirror shape is desired because that focuses the light into the most compact region on the detectors. This makes each segment very light. Unfortunately, it’s only effective against chemical attack, not against dirty fingers or scratches. Webb Telescope's scientists and engineers determined 2.4 meter mirror were scaled to be large enough for Webb, it would be too heavy Next, they traveled to NASA's Goddard Space Flight Center in Greenbelt, Maryland. We can coat primary mirrors with Al/SiO up to 18” in diameter. Webb will do this by observing galaxies that are very distant, at over 13 billion light years away from us. ( Log Out /  Optiques Fullum | Powered by Altitude Strategies. Building a mirror this large is challenging, even for use on the ground. The Advanced Mirror Tighten where appropriate all fixing screws, nuts and bolts; Check the collimation of all optical elements and adjust as necessary; Careful cleaning of all external surfaces on the telescope.


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