next up previous contents
Next: Estimator philosophy Up: Generalities Previous: Generalities   Contents

Noise as a function of time for a single bolometer

The rms noise ( \ensuremath{\sigma_\ensuremath{\mathrm{}}}) of the data obtained with a single bolometer is related to the on-source integration time ( \ensuremath{t^\ensuremath{\mathrm{}}_\ensuremath{\mathrm{\ensuremath{\sigma_\ensuremath{\mathrm{}}}}}}) in a given direction of the sky through

\begin{displaymath}
\ensuremath{\sigma_\ensuremath{\mathrm{}}}= \frac{\ensurema...
...ath{\mathrm{\ensuremath{\sigma_\ensuremath{\mathrm{}}}}}}}},
\end{displaymath} (1)

where \ensuremath{\mathrm{NEFD}} is the noise equivalent flux density of the bolometer, $\ensuremath{A}
\simeq 1/\sin(\ensuremath{\mathrm{el}})$ the airmass and \ensuremath{\tau_\ensuremath{\mathrm{zen}}} the zenith atmospheric opacity.



Gildas manager 2014-07-01