NASA'S Webb Space Telescope To Start Cryogenic Testing | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Recent Daily Episodes

Episode Date

Monday

Tuesday

Wednesday

Thursday

Friday

Airborne On ANN

Airborne 12.05.16

Airborne 12.06.16

Airborne 11.30.16

Airborne 12.01.16

Airborne 12.02.16

Airborne Hi-Def On YouTube

Airborne 12.05.16

Airborne 12.06.16

Airborne 11.30.16

Airborne 12.01.16

Airborne 12.02.16

Sun, Apr 17, 2011

NASA'S Webb Space Telescope To Start Cryogenic Testing

Mirror Segments Exposed To Space-Like Conditions Prior To Launch

The first six of 18 segments that will form NASA's James Webb Space Telescope's primary mirror for space observations began final round-the-clock cryogenic testing this week. These tests will confirm the mirrors will respond as expected to the extreme temperatures of space prior to integration into the telescope's permanent housing structure.

The X-ray and Cryogenic Facility at NASA's Marshall Space Flight Center in Huntsville, AL, will provide the space-like environment to help engineers measure how well the telescope will image infrared sources once in orbit. Each mirror segment measures approximately 4.3 feet in diameter to form the 21.3 foot, hexagonal telescope mirror assembly critical for infrared observations. Each of the 18 hexagonal-shaped mirror assemblies weighs approximately 88 pounds (40 kilograms). The mirrors are made of a light and strong metal called beryllium, and coated with a microscopically thin coat of gold to enable the mirror to efficiently collect light.

"The six flight mirrors sitting ready for cryogenic acceptance tests have been carefully polished to their exact prescriptions," said Helen Cole, project manager for Webb activities at Marshall. "It's taken the entire mirror development team, including all the partners, over eight years of fabrication, polishing and cryogenic testing to get to this point." 


NASA Image

During cryogenic testing, the mirrors are subjected to extreme temperatures dipping to minus 415 degrees Fahrenheit (-248C) in a 7,600 cubic-foot (approximately 215 cubic meter) helium-cooled vacuum chamber. This permits engineers to measure in extreme detail how the shape of the mirror changes as it cools. This simulates the actual processes each mirror will undergo as it changes shape over a range of operational temperatures in space.

"This final cryotest is expected to confirm the exacting processes that have resulted in flight mirrors manufactured to tolerances as tight as 20 nanometers, or less than one millionth of an inch," said Scott Texter, Webb Optical Telescope element manager at Northrop Grumman in Redondo Beach, CA.

A second set of six mirror assemblies will arrive at Marshall in July to begin testing, and the final set of six will arrive during the fall.

The Webb Telescope is NASA's next-generation space observatory and successor to the Hubble Space Telescope. The most powerful space telescope designed, Webb will observe the most distant objects in the universe, provide images of the very first galaxies ever formed and help identify unexplored planets around distant stars. The telescope will orbit approximately one million miles from Earth.


NASA Image

"The Webb telescope continues to make good technological progress," said Rick Howard, JWST Program Director in Washington. "We're currently developing a new baseline cost and schedule to ensure the success of the program."

FMI: www.jwst.nasa.gov

Advertisement

More News

Airborne 12.05.16: AutoGyro Certified, Police Seize Drone, GoPro Job Cuts

Also: Aldrin Evacuated, Shark US, Lufthansa, NASA, ESA's New Orbiter, FLIR Systems, Esterline The expression, “breaking news,” seems to be highly overused nowadays, but>[...]

ANN's Daily Aero-Linx (12.06.16)

Closing Santa Monica Airport: Something Does Not Add Up The latest update from the the Santa Monica Airport pointing out the reasons that the arguments for closing the airport "don>[...]

ANN's Daily Aero-Term (12.06.16): Clutter

In radar operations, clutter refers to the reception and visual display of radar returns caused by precipitation, chaff, terrain, numerous aircraft targets, or other phenomena.>[...]

Aero-News: Quote of the Day (12.06.16)

"Regardless of our appreciation of the public policy arguments raised by opponents, we have been advised that the law and our bilateral obligations leave us no avenue to reject thi>[...]

ANN FAQ: How To Get YOUR News Out On Aero-News

Good News, Bad News... It's ALL News As the preeminent online aviation news resource out there, the editorial staff at Aero-News sees a large number of news releases. We look at al>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2016 Web Development & Design by Pauli Systems, LC