DEAR MRS(Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000700050023-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 17
• Document Creation Date: December 28, 2016
• Document Release Date: March 28, 2002
• Sequence Number: 23
• Publication Date: April 30, 1965
• Content Type: LETTER

Approved FqLRelease 2002/06/17 : CIA-RDP78B04A000700050023-5
25X1A
30 April 1965
25X1A
Enclosed are five copies of Technical Report
No. 3 on the above-referenced contract.
25X1A
WB:aq
Enclosures: Technical Report No. 3 (5 copies)
25X1A cc:
Contracting Officer
Declass Review by
NIMA/DOD
lug W 6Vi 9 92 U
Approved For Release 2002/06/17 : CIA-RDP78B04747A000700050023-5
 Approved FoQ?,elease 2002/06/17 CIA-RDP78BO47W000700050023-5
lechni cal. Report' Igo.
Government contract I
a.. Current Status of Work
ratio betw?eeh the successive target
confirpurati can as show:
largest target is 1
line/ mm.
.l - ;10 lines/mm, 10
-'160
lines/mm. Lach Geri
steps.
GDCt- Z.
The r r , : fr+ -i - 1.000
1~* qtr, =Ui'A:
The fol:Lowi.ng areas have been worked on duZ"ing the . period
starting February 26, 1965,
1. Target fabrication. As a
IF
25X1A
25X1A
 Approved Fc elease 2002/06/T7 IA-RDP78B047 .,000700050023-5
. laing ay .
one e`,e.
steps
printed
tai tL t *eWe t?e*eb brl"yited b>' .va ng
x~t foz' each step. Then this series. wa{s
re
and tfe f3.rst series waas obta.r
- e4
The -Su
.i.ve of the first series anti p bta.tpg ',PO-inc.' i t with
10: to ..1, r#.4uction. The optics ustds a0"YL'AR" 25X1A
mIRI f/1.Sw'
All
saw "a
ran
a direct
Then this
nlarge~
ph~ata
rya ph e :~
i ve for, m M.
coMat print.
wdI Ac.Compi.Isne'u try Axing u le
As t*r r step, usta a -id8a c the "
t t ; ved1 4- a,
time t?t offs
x t der it n# t - .s up "' s tc made
o see er . The inter4ls ti-hg part here was th,
could resolve 500 lines tr h t 4-m ttoub1e
The ta'gets tatbricated
feel, however, that they shQu.i=d be
make the ,pb4se measurements osai'ble.
roved so
 Approved Fb elease 2002/06/17.: .(CIA-I DP78BO47 A000700050023-5.
Experiments are being made to determine various
methods of developing. the film. These methods
were discussed by Dick, a representa;t i ve of the
customer, and Harold of our orgni.zat " on .
b) The contact print necessary to get a series one
PQsitive is:; being eliminated. The contact print.
will be made at the large stage where a loss of
detail is much less critical. Fu?rtherrnore,parallel
illus-inaton w3L1. be used in the printing process.
In ordex to ho .d precise reduction factors and
.cate the -three series pred .sely on one piece
of fib, a more, accurate setup is. being constructed.
d) With. more precise
processing combined with a better
lens, it will be attempted to go up to 100.0 Iines:mir,
2. During this period an e: peri -ental. setup was Fabricated
to give us an idea of tie precigion obt4i.pable in this
method measuring the transfer function of the lens and
also to find the best value of the contrast in the f i l tors
and the necessary freq eney range in the Filters.
After the equipment was finished,.tYe first rneasu,remert
show that a contrast of 2% in the filters is too small.
We therefore are now waiting for more filters with dif-
ferent contrasts.
After working with the instrument our overall. impression
is ;that it will be easy to use when dll parameters are
adjusted,
62I0F /,17 : (CIA-RDP.78B04747AQ 700050023-5
 Approved FYelease 2002/06/17 C4A-RDP78B04743A000700050023-5
3. Mathematical discussion of the attainable precision.
Introduction
Let us fiz' t, for the sake of si.mplici.ty, assume that the
1iht distribution in the target is sinusoidal. We
write for the intensity in the object plane:
VT c c s c/ x
in which VT stands for the visibility of the target and L,,-
is proportinal to its line frequency.
In the image plane this leads to an intensity
tiowi tw x +
in which ' is the modulus of the transfer function; of the
less under test, Lind its phase shift .
The underlying idea ofl the method is to use a ccmpensatic,,.r
method in detertnihing the values 'of 'r - and
n Tip-!re are
two funde rental ly different ways cf' doing thi ire t
method consists of projecting the image ( ) on=to a f ter
with a periodic transinissior. The principle of this rre tt~c. c:
is to arrange things such that the emerging light cli s+ ri but: