[TASK I, ITEM 1 VISITATION TO (Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900020005-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: August 30, 2005
• Sequence Number: 5
• Publication Date: November 10, 1965
• Content Type: LETTER

TAT
TAT
STAT
Approved For Release 2005/11/21: CIA-RDP78B04770A002900020E05-5"
November 10, 1965
Re: Task I, Item 1 Visitation
0
Enclosed are 4 copies of report on visitation to
STAT
To confirm the behavior of film in the UV,] STAT
is going to make, in the next couple of weeks, spectra
transmittance measurements of step wedges of both tri-
acetate and ester film.
I will keep you posted.
STAT
Declass Review by NGA.
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020005-5
 Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020005-5 0
g
November 10, 1965
HIGH RESOLUTION SCREEN
Background
The current contract is the second phase of a unique
attack on some of the limitations of rear projection viewers..
In. the first contract which ended in July 1965 the feasibility
was investigated of using transparent phosphors excited by
ultraviolet radiation to obtain screens which would
a..) Have screen resolutions very much
higher than the 10/mm of present
screens..
b.) Good, brightness for off-axis viewing,
preferably a true Lambertian distribution.
c.) Low reflectivity of ambient room light
so that viewers could be used in well
lighted rooms.
.The investigation was highly successful on all counts and screen
resolution up to 450 1/mm was obtained. The current contract
is a continuation in order to increase phosphor efficiency and
obtain brighter screens and to improve the effectiveness of the
optics and light source in the ultraviolet region.
Summary
A good analytical program is being run along with the
experimental phosphor work. The mechanism of sensitizer
absorption of ultraviolet, intermolecular excitation and
primary phosphor visible. radiation shows promise of greatly,
improved efficiency.
It appears that the gray scale rendition of film in the
near ultraviolet is nearly identical to the gray scale rendition
in the wedges,VP1lolve9N ~/2Th~l -~~~t!> ~f}47t1~~~O COs 5$f step
STAT
 Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020005-5
Discussion
At the request of the'Technical Representative of t
Contracting Officer a visitation was made to STAT
The company has changed names I ow STAT
Although it
is called a division it still has a separate corporate
structure with I las President.
A new team has taken over the technical activity and
is doing the basic phosphor work. He has initiated
analytical program to accompany his experimental program. He
says that the basic mechanism of the phosphor luminesence is
in some cases a two step process.
a.) The ultraviolet radiation is
absorbed by a sensitizer.
b.) The sensitizer excites the primary
phosphor which excits the visible
radiation.
Apparently the primary phosphor is self quenching and it there-
fore appears to be desirable to utilize it in low concentrations.
On the other hand, since the ultraviolet radiation is absorbed
by the sensitizer a higher concentration may increase.the
efficiency. Ed hopes that an optimum combination can be found.
Significant improvement will require long and patient lab work
with a keen awareness of fundamental theory. The mechanism of
absorption and radiation is affected strongly by the carrier
solvent and the mechanism may not be so simple as indicated above.
The question of continuous tone performance of film in
the ultraviolet region as compared to the visible region was
partially covered in the final report on the original contract.
Spectral transmittance curves of a number of Kodak Aerial film
bases and fixed out Kodak Aerial films is shown in Figure 2-1
and Figure 2-2. For the region of interest, 0.3654 microns,
absorption varies from 12% to 35% which is equivalent to a base
fog density of 0.056 to 0.187. In addition the relative brightness
vs. diffuse density plot of Figure 3-2 compares the gray scale
rendition of the "ultraviolet using fluorescent screen" with
"white light using standard rear projection screen." Note that
for the diffuse densities of 0.2 to 1.0 the white light and ultra-
violet light curves are coincident within a few percent. Below
0.2 density it appears there is relatively more absorption in the
ultraviolet. Figure 3-2 includes the effect of the phosphor screen
and therefore conclusions regarding the contrast rendition of film
in the ultraviolet region are not necessarily valid.
STAT
Model 450 Spectrophotometer with
a range from 0.16 to 2.7 microns. He will measure spectral STAT
transmittance of density step wedges of triacetate and thin base
estar film. These measurements will be reported in a later report.
Approved For Release 2005/11/21: CIA-RDP BO477OA002900020005-5
 7
Approved For Release 2005/11/21: CIA-RDP78B04770A002900020005-5
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1. CELLULOSE ACETATE BUTYRATE
2. CELLULOSE TRIACETATE
3. CELLULOSE TRIACETATE (THIN)
4. CELLULOSE TRIACETATE (GRAY)
5. ESTAR THIN BASE
6. ESTAR BASE
7. ESTAR THICK BASE
300 325
WAVELENGTH, millimicrons
Spectral Transmittance of
Kodak Aerial Film Bases (Ultraviolet)
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020005-5
 Approved For Release 2005/11/21-,C1l1 DP78B04770A002900020005-5
0
300 325
WAVELENGTH, millimicrons
8. TYPE 5427
9. TYPE 8401
10. TYPE 8402
11. SO-243
12. SO-102
13. 50-132
14. SO-117
Spectral Transmittance of
Fixed Out Kodak Aerial Films (Ultraviolet)
Approved For Release 2005/11/21: CIA-RDP78B0,4770A002900020005-5
 Approved F,elease 2005/11/21: CIA-RDP78B047?002900020005-5.
WHITE LIGHT USING
STANDARD REAR
PROJECTION SCREE
A
N
ULTRAVIOLET USIN
G
FLUORESCENT SCR
EEN
4m:
150
75
0
5
25
.5 .6
DIFFUSE DENSITY (LOG 104
FIGURE 3-2
Diffuse Density Variation of Kodak Step Tablet #3 (404-ST-13)
Approved For Kgie 20Ow'1M&-:1t1Y& Pf8bbw1?m&~20005-5
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 Approved For Release 2005/11/21 CIA-RDP78B00-900020005
November 16, 1965
Enclamad Its frirm r+ quest ng clearance for 1 -1
has been on our Board of Directors
nce Inception of the cospany.and is now taking on the
duties of Corn orate Secretary-Treasurer. Since he will be
emote intimately concerned with business activities and since
the secretary must witness the Corporate Seal on contracts,
1. feel it is advisable to. requests clearance.
Approved For Release 2005/11/21 : CIA-RDP78BO477OA002900020005-5
 Approved For Release 2005/11/21: CIA-RDP70?7002900020
November 16, 1965
?le
er of October 16 on Plastic Containers
Please let me know if the quantity of containers
you need is on the order of 10,000 to 12,000 or more.
Enclosed is a self addressed stamped envelope.
If you find your original mold and get some more
off it, is there anyway I can buy 300 for my own office
use?
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020005-5