T-ReCS contains three entrance windows that are interchangeable in real
time; the control software selects the window that is best for the
specific observation and conditions.
T-ReCS Windows | |||||||
No. |
Material |
Anti-Reflection Coating | Thickness (mm) |
Transmittance | Absorption Coeff. | Emissivity | Comments |
1 | KBr | No | 10 | 92% @ 2-25 µm | 0.0004/cm | 0.04% | Water soluble |
2 | ZnSe | BBAR optimized for 10 µm |
5.8 | >94% @ 2.5-13 µm >97% @ 8-12.5 µm |
0.0005/cm (+ 2 BBAR) |
0.4% | Small wl coverage, Insoluble |
3 | KRS-5 | No | 5.9 | 70% @ 2-35 µm | 0.005/cm | 0.3% | Insoluble |