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[转贴] Photopic Filter

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gds 该用户已被删除
发表于 2007-5-14 21:27:29 | 显示全部楼层 |阅读模式
This filter simulates the photopic response of the human eye to relatively bright light. In the plot below, the circles indicate the design targets -- the desired transmission of the filter.
: }: i" I/ x3 Q
9 a* T3 F  A7 W; O3 t This design is for normal incidence on a BK7 (ordinary) glass substrate. Two materials are used: SiO2 and TiO2. Starting with a thin, one-layer design, TFCalc's needle/tunneling method produced a sequence of 11 designs of increasing complexity. The design (whose performance is shown above) consists of 32 layers. It matches the entire photopic response curve to within 1%. Phil Baumeister notes that the design can be improved (or simplified) by using a glass whose transmission cuts off near 700 nm.
9 A: |2 n/ p  q' O; b1 b# mHere is the design, with the first layer closest to the substrate and thickness given in nm:
+ d1 ~7 k3 T" S' \1 V    SIO2     119.32
/ \! _7 N: [. X7 U' a: ~    TIO2      10.09" O7 j4 b3 Q  c6 Q  H
    SIO2      32.61
; {8 b- O5 _- ]" H, y% |- m" Q    TIO2      79.19
) P# |& d7 Y4 e( M" k    SIO2      19.857 [1 n6 y3 m/ i5 [. R2 o
    TIO2       9.738 y3 q( K& E4 v$ R
    SIO2     118.20
7 |6 C7 z. B' O! s1 i- g5 @/ y+ A    TIO2      87.90
* [- h# g: t# Q' f! B    SIO2     128.881 x& ]8 q4 A6 G2 b3 C" {
    TIO2      82.480 @2 H) [# x9 X5 L( H: a( ?
    SIO2     121.93- ]5 d$ s1 x/ }% R; B: W
    TIO2      83.91+ w8 x) {3 X& [; `
    SIO2     112.35: |3 F; V) b$ V/ a. _) e3 I
    TIO2      89.57. y' D+ F. }* z) I% C
    SIO2      92.26
% ^5 q/ b5 X; Z7 f    TIO2      66.01
1 Q( ^( F0 x, Y3 f- q8 v    SIO2       8.09
3 m3 P. Y  b7 {; x( W' O: S    TIO2      21.45( J7 W" E3 z: ]- `
    SIO2     103.042 z/ x! C( i6 z) L! y
    TIO2      59.41( a4 }; F  k& b! ?
    SIO2      32.45
4 r0 U" E. I9 V! R5 W; s: T    TIO2      15.368 {% H0 S3 {8 k4 D" g% n" f
    SIO2      98.82
5 x# _4 q7 h7 ?, |    TIO2      51.98
  d% `3 U2 p8 c% n1 {0 B    SIO2      77.54
' H+ l4 `1 T$ t4 z6 d    TIO2      28.263 m: I) B! D* g5 v( N; X
    SIO2      68.84! O+ A* @% T* m
    TIO2      49.47
6 l" M. Q% S; ^0 W: u( ^/ a    SIO2      84.44
* r, X7 R* x/ H) P# W1 d    TIO2      43.02
3 d7 L/ A+ `, h% P  T    SIO2      53.15
8 O- U' t" H$ [    TIO2      39.34
发表于 2007-6-25 22:47:34 | 显示全部楼层
模拟出来不好使
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