S i g n a l - t o - N o i s e
C a l c u l a t i o n s

The calculations here assume a 3-sigma detection of 1e-17 erg/s/cm2 flux in 1 arcsec seeing. We have used the total system efficiency combined with night-sky OH emission and absorption spectra.

Sensitivity at blue wavelengths for the MIT chip will be greater than that shown here, once it has been coated to improve its blue response.

Dark current has not been incorporated into the 200 K plots but only affects those results beyond 900 nm. OH night sky emission-lines beyond 920 nm are not included. All plots assume dark time.

Alternatively, customise you calculations using the new web-based Signal-to-Noise ratio calculator for TTF.