| Revision: | 1.2 |
| Committed: | Wed Oct 8 17:10:53 2003 UTC (20 years, 6 months ago) by greg |
| Branch: | MAIN |
| CVS Tags: | rad5R4, rad5R2, rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1, rad5R3, HEAD |
| Changes since 1.1: | +23 -3 lines |
| Log Message: | Added formula for normal reflectance |
| # | Content |
|---|---|
| 1 | { RCSid $Id$ } |
| 2 | { |
| 3 | These formulas give exact results from the infinite |
| 4 | series solution for an uncoated pane of glass. |
| 5 | |
| 6 | Inputs: |
| 7 | Tn = normal transmittance |
| 8 | n = index of refraction |
| 9 | |
| 10 | Outputs: |
| 11 | rn = single-layer normal reflectivity |
| 12 | tn = transmissivity |
| 13 | Rn = normal reflectance |
| 14 | } |
| 15 | Tn = 0.88; { normal transmittance } |
| 16 | n = 1.52; { index of refraction } |
| 17 | |
| 18 | sq(x) : x*x; |
| 19 | |
| 20 | rn = sq((1-n)/(1+n)); |
| 21 | |
| 22 | tn = (sqrt(sq(sq(1-rn))+4*sq(rn*Tn))-sq(1-rn)) / (2*sq(rn)*Tn); |
| 23 | |
| 24 | Rn = rn + rn*sq((1-rn)*tn)/(1-sq(tn*rn)); |