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SPIRE Design Description - Research Services

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Draft <strong>SPIRE</strong> <strong>Design</strong> <strong>Description</strong> Document<br />

Figure 3-23 - PSW channel at λ = 250 µm, corrugated horn (smooth-wall case TBC). 2 profiles shown are principal<br />

sections of the response. Airy disc radius = 0.27 arcmin.<br />

Component margin,<br />

m<br />

Total geometrical footprint,<br />

diameter D<br />

47<br />

Instantaneou beam footprint,<br />

radius r<br />

Component diameter,<br />

D' = 1.2 D<br />

Figure 3-24 - Illustration of the 20% oversize rule and the comparison between component margin and instantaneous<br />

beam footprint.

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