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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
