PROGRESS REPORT NUMBER FIVE IMPROVED REAR PROJECTION SCREEN SYSTEM

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900020003-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 5
• Document Creation Date: December 28, 2016
• Document Release Date: August 30, 2005
• Sequence Number: 3
• Publication Date: December 14, 1965
• Content Type: LETTER

'Approved For Release 20
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25X1
25X1
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Declass Review by NGA.
14 December 1965
A #7587
Reg. No. 2554
Subject: Progress Report Num er Five
Improved Rear Projection Screen System
The following report summarizes the progress on the project since Progress Report
Number Four dated 19 November 1965. The report format has been changed so as to
relate more directly to the tasks defined by Project Approval Requests (PAR's)
set forth in Q Proposal 3-2554B dated 5 March 1965, and to reflect the report,
outline example recently furnished to
25X1
A letter has been submitted under separate cover to the Contracting Officer
requesting a contract extension of three months. The need for the extension is
due to late delivery of one piece of government owned equipment required for
conduct of.a large portion of the inorganic phosphor research. The equipment
is an AST-200 RF Sputtering Unite, ordered froml _7 25X1
on 25 August 1965. Promised shipment date from was late 25X1
November 1965 at the time of Purchase Order placement. Since that time, the
promised shipment date has'slipped to 15 February 1966. Some delivery slippage
could have been tolerated by rescheduling research and development activities,
however, this is no longer possible, thus an extension in delivery is necessary.
Task: PAR No. 1 - Chemical and Electro-Chemical Screen Development
Discussion: During the last reporting period effort was started to find a
unifying symmetry or asymmetry in complex organic phosphors with the anticipation
of defining the fluorescence mechanism and of predicting new efficient phosphor
molecules. In the brightest organic phosphors investigated to date a similarity
in checmical constitution has been.detected. They are all metal-organic compounds
with the metal ion attached to a benzoyloxy group.
Radiant intensity measurements were taken on (11) single component organic activa-
tor coatings in the form of resin solid solutions. The more, favorable phosphors
consisted of Fluorol 7GA and Uranine B, being of equal intensity, with Brilliant
Yellow 6G base being appreciably the brightest. Spectrophotometer spectra re-
vealed the following fluorescence excitation peaks for these activators and
emission peak for one of the sensitizers with strong near UV absorption.
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Trade Name Chemical Name Excitation Emission
Wavelength Wavelength
Fluorol 2, 8 dimethyl ceroxene 4200,4800, -
Uranine sodium fluorescein 4600 -
Brilliant Yellow 6G naphthamide derivative 4100 -
Calcofluor White RW coumarin derivative - 43001
The excitation peaks of Fluorol and Brilliant Yellow 6G are more closely matched
to the emission peak of Calcofluor White than is the excitation peak of Uranine,
indicating that the former activators would yield the most efficient phosphor
S system when compounded with this sensitizer provided that the activator and
sensitizer molecules are strongly coupled, i.e., wave functions overlap.
The degree of progress attained on the various phases of the phosphor program
are estimated below:
Estimated
Anticipated
Percent
Completed
Percent
Completed
Theoretical
60
60
Experiments, Organics
75
60
Experiments, Inorganics
12
50
Planned Activities: Theoretical activity planned for the next reporting period
will involve calculations on fluorescence conversion efficiency in double organic
coatings, taking into account the photophysical processes of UV absorption, non-
radiative resonance transfer and concentration quenching and maintaining visible
transparency by adjustment of the phosphor concentration and coating thickness
parameters. Ligand-field group theory will be applied to the problem of deter-
mining the effect of dipolar hybrid structure formation in simple functional
radicals on the energy sequence of ordering the ground and excited singlet and
triplet ligand levels when an excited electron is transferred to the bonded
metal ion.
Experimental activity for the next reporting period will be devoted to the study
of spectrally matched compounded aromatic phosphor coatings, scanning the organic
chelates and vacuum evaporting thin films of activated zinc sulfide and zinc
silicate. Sputtering of inorganic phosphor films has been delayed until late
February 1966.
At the end of the next reporting period the overall remaining task will include
aging studies on the brightest, transparent double organic phosphor coatings and
inorganic thin film phosphors, research on antireflection coatings and electric
field effects, and evaluation of lamp: screen systems.
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Task: PAR No. 2, Extended Lamp Source
Discussion: The survey and evaluation of potential U.V. Light Sources can be
considered complete within the scope contemplated for this project. Specifi-
cations for an extended lamp source have been formalized with 25X1
and a purchase order placed for a lamp housing, two amps one
close grid, and one spiral grid pattern), and a power supply.
Planned Activities: Delivery is promised by the end of February 1966 at which
time tests will be made of the radiation pattern of the lamps. There are two
alternatives for further activity based on the test results: (1) If the radiation
pattern is found to be unsuitable for condensing and projection, then either. a
better lamp grid arrangement may be in order, or it may be necessary to drop the
extended source lamp as means of obtaining U.V. radiation. (2) If the radiation
pattern is satisfactory, then work will begin on a suitable condensing system.
Task: PAR No. 3, Light Source Study
Sub-Task: Investigation of U.V. Light Sources
Discussion: The survey and evaluation of available U.V. Light Sources can be
considered complete within the scope contemplated for this project. The results
of the survey and the evaluation of the information obtained has been published
in previous progress reports. Under separate cover, permission has been re-
quested from the Contracting Officer to let a CPFF sub-contract to
for a high.efficiency, ultraviolet light
Planned Activities: Further effort in this area will essentially be limited to
sub-contract management for the duration of the proposed sub-contract.
Sub-Task: Projector Optics Development
Discussion: Effort in the area of projector optics is primarily dependent on
the configuration and radiation pattern of the U.V. Light Sources..
Planned Activities: Work in the area of projector optics will begin as pre-
liminary information on the U.V. Light Sources becomes available. It will not
receive additional emphasis until.delivery and test of the light sources.
Task: PAR No. 4, Bandwidth Limited and Special Purpose Optics
Sub-Task: Zoom Lens Investigation
Discussion: The survey and evaluation of potential sources for U.V. Zoom Lenses
is contained in previous progress reports. 'In a recent meeting with the Technical
Officer, it was agreed that effort in this area should remain minimal investi-
gatory level for a period of about two months while further work was done in the
area of basic phosphor research and more efficient light sources. ? .
25X1
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25X1
Planned Activities: At this point in the program, it is advantageous to let a
sub-contract to for the design of a mechanically
compensated, Zoom Lens System. Their proposal has been discussed in previous
progress reports. A letter has been submitted to the Contracting Officer under
separate cover requesting approval to let a study contract to
The attached Funding Commitment Report shows the current project financial status.
Sincerely,
25X1
25X1
WDS:ELF:MR:ja
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