3 ms·
My first cut guess is that at each telescope at each relevant point in time, they need to capture both the intensity and the phase of the sub-millimeter wave el
by graycat 10y ago
My first cut guess is that at each telescope at each relevant point in time, they need to capture both the intensity and the phase of the sub-millimeter wave electro-magnetic signal and, then, for each point in time add those signals.
So,
(1) How do they get the time points coordinated just right among all the telescopes?
(2) How do they capture both the amplitude and the phase of the signals?
Gee, maybe readers are not supposed to ask such questions?
- wl 10y ago(1) Atomic clocks. (2) They mix the bands of interest down to intermediate frequencies that can be readily digitized. It's the same old superheterodyne principle we've used for the last century or so.
- graycat 10y agoSuper! Thanks! I wondered how they would get an analog to digital converter to work a sub-millimeter frequencies. So, right, they don't!