FIRST LETTER REPORT ON EVALUATION (U) (15 NOVEMBER 1965 TO 15 DECEMBER 1965)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002900030017-0
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: June 19, 2002
• Sequence Number: 17
• Publication Date: December 16, 1965
• Content Type: REPORT

25X1
SECRET This Document Consists of. Pages.
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FIRST LETTER REPORT ON EVALUATION (U)
(15 November 1965 to 15 December 1965)
25X1
DECLASS REVIEW by NIMA/DOD
Gw-) a-1
Excluded from wzta-amfic
25X1
25X1
a00tuncnt eoat~ind iafdrnwtion affecting
dw notional defame of The United $tatw within the
meaning of the FaPlonege Laws, Title 18, U. S.
eaitlene 793 and 794. Its tranT
elation, of Its contents in an' 'i For Releas
"On"thorivto DPr.nn
and deciassificat.i.
C1A-RDP78B04747A002 00 17-0
/(917/
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First Letter Report on Evaluation (U)
The major efforts during this reporting period were in two areas:
1. Delivery, installation, and checkout of the oherent 25X1
Enlarger System.
2. Design of preliminary theoretical and experimental evaluation techniques
for initial characterization of the imaging properties of the enlarger.
people, under direction ofl
to contractor in last section), were most cooperative and diligent in delivering,
installing, and performing the initial system checkout at the
Lab Facilities. As far as could be ascertained by
operating in "as good a condition at
0
(see visits 25X1
0
Physical Optics
the enlarger was
25X1
25X1
25X1
25X1
s it had ever been operated at
Although this is a qualitative statement it does reflect that the
Project Leader
any deleterious effects (mechanical, optical, electrical or electronic) during its
disassembly and reassembly stagps at
A series of test exposures of an v 2 3 bar high contrast resolution
target were made during the final checkout by
25X1
These exposures were 25X1
during his visit of 19 November and have been
examined by the writer using a 32 power microscope. It should be noted that the
only valid information to be obtained from this series is the relative image quality
for 3 bar high contrast targets and the change in the imagery at different positions
in the 9 x 9 film plane. The discrepencies in imagery for symmetrically located
areas from the optical axis or center of the film frame can be due to improper
optical alignment of the optics, the film magazine, the liquid gate film holder, and/or
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Resolution vs Location, Object* Plane,
Viewing from Image Plane Towards Object Plane
Location
Approximate
Coordinates
cutoff (just
resolved)
Good Imagery
(well resolved)
(x ,
y)
line pairs/mm
line pairs/mm
Top Left
(8
3/8",
1
3/4")
102 V
57.0 V
Top Right
(1
3/8",
5/811)
40. 3H
16 H
102 V
28.5 V
Bottom
(
7/8 ",
8
1/4")
71. 8H
32 H
Right
90.5V
32 V
Bottom
Left
(8
7/8",
8
1/8")
181 V
128 V
Center
(4
1/2",
4
1/2")
203 V
144 V
The, image plane resolutions are 1/4 the above values due to the 4X enlargement
from object plane. i. e. 102,e/mm is 25.5 i/mm on the image plane film record.
25X1 ilm was used to record these images.
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Figure 1. Schematic location of "Well Resolved" Bars from 3 bar target data
on SO-243 film - 11, 12 December 1965. Line pair resolution figures
refer to object space resolution. Image space resolution is 1/4 the
stated value due to 4X enlargement ratio.
X
14H
99 V
37 h
// Y
)19y9
/99 V III
/IgN
)25.V
3bW
3RV
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decentering of lens elements within either (or both) of the 9" or 36" focal length
imaging lenses. The only purpose of showing these values now is to record the
performance of the enlarger, for a particular target, at the time of transferral
Whether sibsequent tests by
personnel 25X1
can locate the source of these deviations from the original specifications (2002/mm
over entire field at 0. 83 modulation contrast transfer) and reduce their magnitude
remains to be seen.
Further system evaluation by means of photographic image recording
through the enlarger has been avoided until a suitable film processing system was
darkroom and until meaningful results from a theoretical study
of partially coherent imaging are available to guide us in the design and fabrication
of suitable targets. A gas bust agitation system has now been completed using
3 1/2 gal processing tanks to enable us to process 9" aerial film in short lengths
(1 or 2 frames). Although theoretical studies are not yet far enough along to
indicate conclusively the best method of determining the degree of coherence in the
object plane of the enlarger two approaches are under investigation. The first, the
use of a two aperture variable spacing interferometer is under design, and the second
approach involves measurement of edge trace data to obtain both the coherence
interval and the systems apparent transfer response.
WORK FOR NEXT PERIOD
Completion of design and fabrication of the variable spacing interferometer
should be accomplished during this period. The theoretical analysis of the use of
edge targets as test objects should be completed and their applicability to the evalu-
ation will be assessed. If this indicates the edge as a suitable test target then a
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master reference edge will be fabricated and used. Other test targets, such as
Ronchi rulings and sine wave targets will be evaluated and their applicability as
test objects determined. A master target may be fabricated to aid in the align-
ment of the 9 x 9 film back and optical system to try and improve the non-symme-
trical image resolution fall-off presently obtained in the enlarger system.
VISITS TO CONTRACTOR
During the weeks of 8-18 November 1965 the following
personnel were at
the coherent Enlarger.
for the assembly and checkout of
25X1
25X1
On 9 and 10 November 1965, Mr. George M., the sponsor's technical contract
monitor, was at
He examined the enlarger during its
and 25X1
assembly phase and discussed the I rogram with
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