[time-nuts] OT - but of interest?

J. Forster jfor at quikus.com
Sun Apr 28 00:32:41 UTC 2013


Sometimes imaging sensors are just not available at wavelengths of
interest. There is no choice but mechanical scanners.

Bearings are also needed to de-spin antennas, etc.

-John

=========


> On Sat, 27 Apr 2013 12:06:45 -0700 (PDT), L. Forster wrote:
>
>>When I was building space payloads, every component had to meet or exceed
>>a VCM (Volitile Condensible Material) spec.
>
>>This was mainly of concern with plastics, like wire insulation (we used
>>Teflon and Kapton) but especially potting compounds.
>
>>And, don't even think about ball bearings near optics in scanners!!
>
>>-John
>
> Most of our payloads revolved around high-resolution optics including high
> dispersion
> spectrographs.  Mechanical items were either verboten or encountered
> serious design reviews
> that frequently made you put your optics in a separate container.
>
> Even with space QPL'd parts, I would be amazed at the goop that the techs
> would clean out of
> the vacuum tunnel diffusion pump traps at the end of the test cycles from
> all of the compounds
> that migrated into them.
>
> Greg
>
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