HIGH RESOLUTION SCREEN

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900020026-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: August 30, 2005
• Sequence Number: 26
• Publication Date: January 15, 1965
• Content Type: REPORT

Approved Foolease 2005/11/21: CIA-RDP78BO4700290 q$$
January 15, 1965
HIGH RESOLUTION SCREEN
The UV projection lens designed for the program by =is
being made by There was considerable
delay because could not measure the index
of refraction o t e glass blanks in the UV region required
by the design.
STAT
STAT
finally made the index of refraction measurements
using a phosphor-coated plate produced on this program to
make the UV line visible for measurement. STAT
is proceeding to make the optical elements u Wltft
spherical surfaces. The will not as herize the surfaces on
a fixed price purchase. has requested STAT
authorization to place a time an material order with
I I to aspherize the elements as required by
The lens can be used with spherical surfaces and still
give high resolution if it is stopped down. It will be
assembled and tested in this manner before proceeding with
to finish the elements by the end of
January,
A large II projector with 2500-watt mercury arc lamp
was erected to illuminate 12" x 12" phosphor-coated plates
with UV. Absorption filters were used to eliminate the
visible, but they were not very efficient. When looking
directly into the projector, a strong bright central
spot of violet came through making it impossible to
view the phosphor screen straight on. The visible green
image from the phosphor produced by the ultraviolet
illumination was visible on the glass plate from all
angles.
Declass Review by NGA.
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020026-2
 Approved Fqeelease 2005/11/21: CIA-RDP78B04-0002900020026-2
STAT
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0
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High Resolution Screen .-2- January 15, 1965
For the next Dhase.I will use high-efficiency
dichroic filters which will much more ertectivety separaLe
the ultraviolet from the visible light.
tated that some promising new inorganic phosphors
had been found by
work. They think maybe the new inorganics. will be three
times as bright as any phosphor yet tried.
in con-
nection with some of their recent proprietary research
diligently to define the n - hase of the
is workin
g
p
program based on instructions received by
on his trip to Washington, D. C., on January , 1965.
There will be four major aspects of the work:
1. Chemical and Electrochemical Study of Screen Material.
2. Bandwidth Limited and Special Purpose Optics.
3. Light Sources.
4.
Final negotiations are now
in p .
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0
Computer Interface Display.
is being purchased from
Approved For Release 2005/11/21: CIA-RDP78B04770A002900020026-2