在FRED中通過倒追和正追的方式確定光機系統(tǒng)的關(guān)鍵面、照明面和重要面。照明面是指光學系統(tǒng)中被外界雜散光源照亮的面;關(guān)鍵面是可以從探測中看到的面;關(guān)鍵面和照明面的重疊面即為重要面。重要面是光機系統(tǒng)中一次雜散輻射的主要來源,雜散光的抑制也就是努力減少重要面的數(shù)量。 {Rear2
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Node Name Universe Detector IF +i3#$
6 Geometry.fastcass.Primary mirror.Reflecting Surface 8.73949821062508 .339134565809722 ^Q{Bq
7 Geometry.fastcass.Primary mirror.Back Surface 0 0 #"ftI7=42
8 Geometry.fastcass.Primary mirror.Edge 0 0 kJAn4I.l
9 Geometry.fastcass.Primary mirror.Hole 0 1.00188578326391E-04 e8EfQ1 Ar
11 Geometry.fastcass.Secondary mirror.Reflecting Surface 8.71700830771184 .420485262312074 $fpq
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12 Geometry.fastcass.Secondary mirror.Back Surface 0 0 ]O
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13 Geometry.fastcass.Secondary mirror.Edge 0 4.83222296869994E-09 3^StIw{X
16 Geometry.fastcass.dewar.FPA.detector array 6.28915267493816 1.09779504189775E-02 axk"^gps
18 Geometry.fastcass.dewar.dewar window.Surface 1 8.70787200780954 1.01116317462709 ]}mxY
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19 Geometry.fastcass.dewar.dewar window.Surface 2 8.70787200780954 1.0111548796955 cM&2SRBZ
20 Geometry.fastcass.dewar.dewar window.Edge 0 8.29493159668308E-06 %y<ejM
22 Geometry.fastcass.dewar.outer wall.Surf 1 0 4.61988409432715E-05 (5<^p&
24 Geometry.fastcass.dewar.retaining ring.Surf 2 0 5.38379092582642E-05 ,WQ^tI=O
27 Geometry.main barrel.Surf 3 1.45194696071729E-02 4.48783425373457E-03 /EMJSr
29 Geometry.Primary baffle.Surf 3 1.44803828118383E-06 .597464630934777 W><dYy=z5
31 Geometry.Secondary baffle.Surf 3 .969627358028687 .137673353852238 j+8TlVur
32 Geometry.Secondary baffle.Surf 4 1.1502279482165E-12 1.42111455012594E-03
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33 Geometry.Secondary baffle.Surf 5 .727220518519163 6.21692034227466E-05 -z:&*=
36 Geometry.Secondary struts.strut a.Surf 6 .97011784785664 1.11300844081723E-02 [,~TaP}m
38 Geometry.Secondary struts.strut b.Surf 6 5.49202068783075E-14 1.09981876986085E-02 7dX/bzUVz8
40 Geometry.Secondary struts.strut c.Surf 6 .242406839506173 1.09806859127091E-02 #g5^SR|qE
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Node 為幾何結(jié)構(gòu)節(jié)點數(shù),Universe為空間光源正向追跡的效果,Detector是反向追跡的效果。 q+a.G2S
軟件打開后,運行critical and illuminated objects腳本,可生成上述結(jié)果。