Subscribe free to our newsletters via your
. 24/7 Space News .

Stanford Students Fly In Zero Gravity To Protect Satellites From Tiny Meteoroids
by Louis Bergeron
Stanford CA (SPX) Nov 22, 2010

Graduate students Nicolas Lee, left, and Shandor Dektor, during one of the deployment tests on the zero gravity airplane.

Stanford researchers have completed the first successful tests in zero gravity of a canopy for CubeSats - the tiny satellites that hitch rides on rockets sending larger satellites into orbit. The goal is to gather data on what happens when micrometeoroids slam into a satellite. Such impacts often knock out electronic equipment on satellites.

The encounters are poorly understood, but the canopies could be a first step in eventually building "black boxes" for satellites similar to airplane flight recorders.

Orbiting the Earth is risky business for a satellite. Over a hundred billion meteoroids enter Earth's atmosphere every day, and while big, fierce, spacecraft-crushing meteoroids are rare, even the tiniest ones are a hazard.

What happens when a really tiny meteoroid (so small a stack of 500 would stand less than an inch tall) hits a satellite is not fully understood, but Stanford researchers have successfully done preliminary testing of a device that may help shed light on these collisions in space.

The testing was in zero gravity, aboard a diving airplane flying over the ocean.

Nicolas Lee, a graduate student in aeronautics and astronautics, and several colleagues have designed a canopy to pop out of a tiny satellite called a CubeSat and absorb the impacts of these micrometeoroids, sometimes referred to as "interplanetary flyspecks."

"The canopy might eventually be deployed to protect a spacecraft from meteoroids or shield it from the sun, but for now, we just want it to get hit," Lee said.

Even tiny meteoroids travel at tremendous speeds in orbit around the sun (more than 250,000 kilometers per hour) and pack a hefty punch when they strike a spacecraft.

"It is pretty much an explosion," Lee said.

Since the impact disrupts the satellite's electronics, no one knows exactly how the micrometeoroid causes the damage. But Lee's advisor, Sigrid Close, assistant professor of aeronautics and astronautics, has a theory.

She suspects the meteoroid instantly vaporizes into free electrons and ions that float around in a little ball. As that ball expands in the vacuum of space, it gives off energy at radio frequencies that interfere with the electronic equipment on the satellite, disrupting communications and other essential functions.

"We want to fly a dedicated mission that can study this effect and make sure that we can protect against it," Lee said. For that mission, the team would work with Andrew Kalman, a consulting professor of aeronautics and astronautics, to equip a CubeSat with plasma sensors and radio antennas to measure radio frequency emissions.

As a first step in field-testing their canopy, Lee and fellow graduate students Shandor Dektor and Joseph Johnson recently tested their canopies in zero gravity aboard a NASA-hire airplane flying over the Gulf of Mexico.

The plane flew a flight path any rollercoaster lover would die for: up and down in a series of parabolas, from about 22,000 to 32,000 feet. At the top of each parabola, the plane's occupants experienced weightlessness for about 20 seconds, which was when the team tested how their canopies opened. Over the course of two flights and 80 parabolas, the students did 37 successful trial runs.

Operating in zero gravity took some getting used to. "You don't realize gravity is gone so you are still pushing against it," Lee said. "And so you end up feeling like you are falling upwards."

The team tested three prototypes of the canopy, each a square meter in area. One design was thin mylar, rolled up in a spiral pattern inside the little black CubeSat box. Another design had the mylar folded to expand in a radial pattern. The third design used the spiral unfolding, but with a thicker membrane for the canopy. For all the designs, the unfolding was powered by struts made of common metal tape measures rolled up with the canopies.

The thin membrane rolled in a spiral pattern was the most successful. Lee thinks with proper folding, a thicker membrane could work well, too. Although Lee had some prior experience in origami, he said getting the proper folding was initially just trial and error.

"I folded so many prototypes," he said. But after figuring out the basic geometry of the folding, he developed a mathematical algorithm to employ.

"We are also hoping to deploy some metallic sheets, which might give us a different effect than the plastic mylar we've been using," he said. "For the purpose of a meteoroid impact screen, we would need a thicker membrane so the screen doesn't break when it gets hit by a large meteoroid."

When the CubeSat is deployed in space, in addition to zero gravity, it will have to open in a vacuum, so the researchers want to take their canopies into a vacuum chamber and shoot high velocity particles at it to supplement the zero gravity tests.

As the CubeSat canopy testing progresses, Close sees long-term potential not only in protecting satellites but also in recording what spacecraft experience in orbit.

"This could lead to devices that could be attached to satellites just like a black box in an airplane," Close said.

The zero-gravity flight was sponsored by the National Aeronautics and Space Administration.


Related Links
Space Technology News - Applications and Research

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Development Of Meteosat Third Generation To Start
Paris, France (ESA) Nov 19, 2010
Marking a significant milestone for Europe's next fleet of meteorological satellites, ESA has given the go-ahead to Thales Alenia Space in France to start work on developing the Meteosat Third Generation. The 'Preliminary Authorisation To Proceed' was signed after a kick-off meeting between ESA and Thales Alenia Space. This approval follows several months of negotiations that has resulted ... read more

Mining On The Moon Is A Not-So-Distant Possibility

New Analysis Explains Formation Of Lunar Farside Bulge

New type of moon rock identified

Moon Express Enters $30 Million Google Lunar X PRIZE Competition

NASA Mars Rover Images Honor Apollo 12

Leicester Scientists Involved In Development Of New Breed Of Space Vehicle

IceBite Blog: Setting Up An IceBreaker

Camera On Curiosity's Arm Will Magnify Clues In Rocks

NASA Administrator Bolden's Statement On International Space Summit

KLM Announces Suborbital Flight Relationship With Space Experience Curacao Launches Space Tourism

Soyuz Returns To Earth Earlier Than Planned

China To Launch First Female Astronauts

Two Telescopes For Tiangong

Chinese Female Taikonaut Identified

Tiangong Space Lab Spurs China Space PR Blitz

ISS crew to return to Earth early

German Robotic Arm Completes Its Five-Year ISS Mission

ISS Crew Completes Spacewalk

Space Station Spacewalk Under Russian Program Planned For Today

Ball Aerospace STPSat-2 Satellite Launches Aboard STP-S26 Mission

Ukraine Delivers Taurus II Launch Vehicle's First Stage To US

Ball Aerospace's First Standard Interface Vehicle Set To Launch

ILS Proton Launches Lightsquared Satellite

500th 'extrasolar' planet discovered

Planet From Another Galaxy Discovered

First glimpse of a planet from another galaxy

Eartly Dust Tails Point To Alien Worlds

Apple releases updated operating system update for iPad

Stanford Students Fly In Zero Gravity To Protect Satellites From Tiny Meteoroids

News Corp. set to unveil iPad newspaper, 'The Daily'

FASTRAC Team Ready To Enjoy Launch

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement