Ion-motor
En ion-motor er en motor til rumfart som accelererer ioner ud af motoren via et elektrostatisk felt. Ionerne kan f.eks. være ioner af grundstoffet xenon. Dette kan i dag gøres mere effektivt (per gram) end med traditionelle brændstof-raketmotorer. I 2006 var ionmotorer mere end 10 gange så effektive som raketmotorer per gram udsendt stof.
Se også
Eksterne henvisninger
- 5. aug 2009, Ing.dk: En million grader varme ioner kan sende rumskib til Mars på 39 dage Citat: "... 100 gange kraftigere end andre ionmotorers..."
- 2006-01-12, Sciencedaily: Europeans And Australians Make Space Propulsion Breakthrough Citat: "...The new engine is over ten times more fuel efficient than the one used on SMART-1..."
- 26.10.2003, Ing.dk: Fremskridt for ion-motorer Ny motor fra firmaet Aerojet har tre gange bedre ydelse end nuværende motorer til raketter.
- NASA's Evolutionary Xenon Thruster (NEXT) Arkiveret 13. oktober 2003 hos Wayback Machine
- 2003-11-21, Science Daily: NASA Successfully Tests Ion Engine
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Science stub icon.
This image of a xenon ion engine, photographed through a port of the vacuum chamber where it was being tested at NASA's Jet Propulsion Laboratory, shows the faint blue glow of charged atoms being emitted from the engine.
The ion propulsion engine is the first non-chemical propulsion to be used as the primary means of propelling a spacecraft. The first flight in NASA's New Millennium Program, Deep Space 1 is designed to validate 12 new technologies for scientific space missions of the next century. Ion propulsion was first proposed in the 1950s and NASA performed experiments on this highly efficient propulsion system in the 1960s, but it was not used aboard an American spacecraft until the 1990s.
Deep Space 1 was launched in October 1998 as part of NASA's New Millennium Program, which is managed by JPL for NASA's Office of Space Science, Washington, DC. The California Institute of Technology in Pasadena manages JPL for NASA.
The almost imperceptible thrust from the ion propulsion system is equivalent to the pressure exerted by a sheet of paper held in the palm of your hand. The ion engine is very slow to pick up speed, but over the long haul it can deliver 10 times as much thrust per pound of fuel as more traditional rockets.
Unlike the fireworks of most chemical rockets using solid or liquid fuels, the ion drive emits only an eerie blue glow as ionized (electrically charged) atoms of xenon are pushed out of the engine. Xenon is the same gas found in photo flash tubes and many lighthouse bulbs.