SPIRE Design Description - Research Services
SPIRE Design Description - Research Services
SPIRE Design Description - Research Services
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Draft <strong>SPIRE</strong> <strong>Design</strong> <strong>Description</strong> Document<br />
Trans.<br />
Figure 4-28 - Performance of a prototype 15-cm -1 dichroic (red: reflection; blue: transmission)<br />
4.6.2 Spectrometer filtering scheme<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
0 5 10 15 20 25 30 35 40<br />
Frequency [cm-1]<br />
The spectrometer filtering and beam-dividing scheme is summarised in Table 4-5. The first two filters are<br />
shared with the photometer, and the remaining ones are placed over the arrays. The beam splitters are<br />
designed to have near 50% transmitivity (T) and reflectivity (R) over the FTS spectral range. The beam<br />
splitter efficiencies as viewed by the two detector arrays are 4RT and R 2 + T 2 , both of which should be close<br />
to 100%.<br />
85
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