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From: Ian Stirling
Subject: Re: Temperature cycling of wirebonds.
Date: Mon, 30 Sep 2002 01:32:38 +0000 (UTC)
NNTP-Posting-Date: Mon, 30 Sep 2002 01:32:38 +0000 (UTC)
User-Agent: tin/1.5.6-20000803 ("Dust") (UNIX) (Linux/2.4.18 (i686))
Nico Coesel wrote:
> Ian Stirling wrote:
>>I know this is a "how long is a bit of string question".
>>I'm wondering about cooled camera chips in vacuum.
>>Specifically orbiting ones, thermoelectrically cooled.
>>These might see a temperature range of -100C - 50C or so, and
>>perhaps over 10K cycles.
>>Do many sorts of wirebond fail at this sort of cycling?
> In space cooling is not a real problem. In some cases satellites need
> heaters to keep certain areas warm. The temperature in space is around
> 4 Kelvin. The only 'problem' is to transport heat to the dark side of
> a satellite. This is usually done by heatpipes and radiators (plain
> old heatsink). Passive cooling is also an option. A relative of mine
Camera chips are often cooled actively, in order to reduce noise.
In low earth orbit, you'r in shadow for 1/2 the time, and may have problems
providing power in the dark (batteries have limited cycle life).
In low earth orbit, it's hard to get much below 0C, unless you try moderately
hard, as the hot earth fills one side of the sky.
http://inquisitor.i.am/ | mailto:firstname.lastname@example.org | Ian Stirling.
Prosperity and ruin issue from the power of the tongue.
Therefore, guard yourself against thoughtless speech.
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