S y s t e m
E f f i c i e n c y

The total system efficiency curve is plotted below, for both detectors at a range of operating temperatures. This includes losses due to atmospheric absorption, Taurus-2 optics (0.60), TTF Fabry-Perot filter (0.90), blocking filter (0.90) and CCD quantum efficiency. An adjustment is also made for the triangular shape of the Airy profile within its FWHM (0.75).

These calculations give a reliable estimate of system performance.