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Robots vs solar/cosmic radiation ? 2
- Thread starter rb1957
- Start date
Some amount of shielding is possible, but heavy; radiation-hardened electronics is very expensive to begin with, and redundancy is also expensive.
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- Thread starter
- #3
That's what I expected … to "ruggedize" satellite electronics (outside of the van Allen belts) is not QED. We've obviously done it so it's not That difficult … just the cost of doing business in space.
another day in paradise, or is paradise one day closer ?
another day in paradise, or is paradise one day closer ?
The two major costs are
> IC design -- different processing, guard rings, etc., means that any high-performance processor is essentially set back a couple of generations. Even the lowliest logic gates would need to be hardened
> testing -- gamma ray, x-ray, etc. very expensive, since there's only a few places that have the radioactive sources.
Shielding adds weight, which adds to launch costs.
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> IC design -- different processing, guard rings, etc., means that any high-performance processor is essentially set back a couple of generations. Even the lowliest logic gates would need to be hardened
> testing -- gamma ray, x-ray, etc. very expensive, since there's only a few places that have the radioactive sources.
Shielding adds weight, which adds to launch costs.
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Compositepro
Chemical
I guess one way of looking at it is that on the surface of the earth we have an enclosure with 15 lbs./sq.in. of mass shielding us from radiation on one side, much more on the other).
There's that, plus our magnetosphere
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Some COTS electronics are used on the International Space Station. At the LEO altitude of the ISS the Earth magnetosphere still provides a lot of shielding. The COTS electronics allowed do not perform critical functions, and the astronauts can change it or do without if it should fail.
ISS is in a pretty low LEO, at that; it needs to be continually re-supplied with fuel, although it uses much less at its current altitude (~400 km) than its previous 350-km altitude.
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- Thread starter
- #9
No, it's pretty common, actually. And, since the magnetosphere doesn't make it to the Moon, any lunar probes get the full effect, although they get shielded as they go around the backside of the Moon.
The oldest functioning Earth/Moon probe appears to be ARTEMIS The oldest functioning satellite was GOES3, which operated for 38 years
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The oldest functioning Earth/Moon probe appears to be ARTEMIS The oldest functioning satellite was GOES3, which operated for 38 years
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Want to read about radiation hardening?
Go to Jupiter.
JUNO
That link is a bit basic, but may provoke searches that deliver more detailed info.
There is a mil-spec for EM shielding. Maybe there's one for radiation shielding. Well, no - I'm sure there is one. But "Maybe" it's publicly readable on ASSIST.
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF
Go to Jupiter.
JUNO
That link is a bit basic, but may provoke searches that deliver more detailed info.
There is a mil-spec for EM shielding. Maybe there's one for radiation shielding. Well, no - I'm sure there is one. But "Maybe" it's publicly readable on ASSIST.
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF
I wonder about cubestats. They're completely based on cellphones.
Keith Cress
kcress -
Keith Cress
kcress -
They are usually in extremely low orbits and typically are designed for about 1 yr max life.
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Ah. I wonder if any have suffered premature failures rationally attributed to radiation.
Keith Cress
kcress -
Keith Cress
kcress -
Looking on the internet there is a lot of info on cubestat and radiation. Mostly on anticipated effects and radiation testing. Some seem to have employed some rad-hard electronics apparently to reset the commercial electronics payload in the event of an upset.itsmoked said:
I did find this list on nanosatellites: If you click the "view fullscreen", in an expanded database list you will get a column with a simple statement of end-of-mission failure and date. Most seem to have attributed failure to reentry, power systems, or batteries. I guess you can't know if "loss of communications" or other reason is actually due to radiation.
Cosmic rays are the most energetic, and it's reported that the majority of those are not originating from our Sun.
For radiation from our Sun, in this context we finally have a chance to use the phrase 'dark side of the Moon' in a precisely correct manner, but...
"...shielded as they go around the backside of the Moon."
For radiation from our Sun, in this context we finally have a chance to use the phrase 'dark side of the Moon' in a precisely correct manner, but...
"...shielded as they go around the backside of the Moon."
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2
- #17
"...shielded as they go around the backside of the Moon."
Where the satellite is safely protected from radiation from the Earth.
Eg. Fox News broadcasts.
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF
Where the satellite is safely protected from radiation from the Earth.
Eg. Fox News broadcasts.
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF
Except from neutrinos which don't notice things like the earth.
Keith Cress
kcress -
Keith Cress
kcress -
charliealphabravo
Structural
There is a Venus probe in the works (LLISSE) that is being design for one of the more extreme environments in the solar system. The chips will be built from/hardened by? silicon carbide.
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