3 ms·
> Next month, the first batch of polished mirror segments should set off from France by ship in a temperature-controlled container. Why do they need a temperat
by denton-scratch 3y ago
> Next month, the first batch of polished mirror segments should set off from France by ship in a temperature-controlled container.
Why do they need a temperature-controlled container for shipping? I would have expected that temperature control would only be needed once they're deployed and in service.
- agent327 3y agoYou want to avoid condensation (and other depositions) on the mirror surface. That is most easily avoided if the mirror is slightly warmer than the environment. Of course the container is sealed as well, but there's always some moisture in the air anyway, and it's worthwhile protecting the mirrors from that.
- input_sh 3y agoMirrors deform under temperature changes, and the precision target is measured in tenths of nanometers.