REAR PROJECTION SCREEN EVALUATION

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A002000010025-5
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: November 8, 2012
• Sequence Number: 25
• Publication Date: May 23, 1968
• Content Type: MEMO

Declassified in Part- Sanitized Copy Approved forRelease2012/11/08 : CIA-RDP79B00873A002000010025-5
CONFIDENTIAL
NPIC/TSSG/TPD/EL-632-68
23 May 1968
MEMORANDUM FOR THE RECORD
SUBJECT: Rear Projection Screen Evaluation
1., In response to Memo-NPIC/TSSG/DED-1186-68
a study was made of a rear projection screen supplied by him.
requested the following:
a. The modulation transfer function
b. The brightness distribution
c. The efficiency
d. The ambient light sensitivity
e. Subjective characteristics such as?grainness
He
2. Tests were performed by EL personnel with the following
results:
a. A modulation transfer function analysis could not be
made due to time and equipment consideration. In lieu of this
solution, tests were made using high contrast targets. When
the target was projected on the screen 92 lines/millimeters
could be observed. A good quality lens was used, however, it
did have some losses such that the actual resolution limit of
the screen assuming a high contrast input is probably in the
order of 120-130 lines per millimeter. The contact resolution
(resolution target in contact with the diffuse side of the
screen is in the order of 100 lines/millimeters).
b. Figure 1 depicts the brightness distribution.
c. The gain is approximately 3.
d. The diffusing surface reflects and scatters very little
energy back toward the source with the consequence that slight
subdued levels of ambient illumination can be tolerated providing
that reasonable precautions are taken (specular reflections from
the smooth side of the screen could bother the operation).
CONFIDENTIAL
ICECUP I
Excluded front automatic
downgrading and
, --ttec4asification
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Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873A002000010025-5
Declassified in Part- Sanitized Copy Approved forRelease2012/11/08 : CIA-RDP79B00873A002000010025-5
0 CONFIDENTIAL
e. The screen has a granular appearance which is evident
at 7x but even at 30x was not bothersome in observing 90 1/mm
imagery. The granules have a presmatic effect such that there
is evident coloration but this also was found not to be bother-
some.
3. Should further assistance or information be required, please
contact TSSG/TPD/EL,
Exploratory Laboratory, TPD
CONFIDENTIAL
25X11
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Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873A002000010025-5
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Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873A002000010025-5