FILTER VISIBLE REJECTION
(from CJW mail message of 15 December 1996)
A set of data was taken on 12 December 1996 wherein each of the UV
filters was put into the stimulus beam and, by a combination of
adjusting the lamb voltage and exposure time, reasonable images were
obtained. The light was falling on the 171 Å channel after being
"disturbed" by the periscope and the stimulus telescope wedges. After
boot-strapping from different pairs to different pairs the transmission
is as shown below, which is then compared to the average at 5000
Å and 6000 Å as provided by ARC. The agreement is quite
good.
| Filter | TRACE | ARC
|
|---|
| Fused Silica | 0.88 | N/A
|
| 1216 Å Filter | 1.6E-4 | 1.65E-4
|
| 1600 Å Filter | 2.4E-5 | 1.95E-5
|
| 1550 Å Filter | 5.6E-7 | 7.6E-7
|