(UNTITLED)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002500040001-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 7
• Document Creation Date: December 28, 2016
• Document Release Date: April 15, 2002
• Sequence Number: 1
• Publication Date: August 31, 1964
• Content Type: MISC

Approve Me lease 2002/06/17 : CIA-RDP78B0474W-'002500040001-0
August 31st, 1964
PROPOSAL
This proposal relates to the development of a light
amplifying screen utilizing dipolar suspension.
STATINTL
1. Description of the Device-
,The properties of dipole particles in suspension form
are described in the enclosed pamphlet entitled "Dipoles and
Their Application to Graphic Arts". These dipole suspensions
form the basis for the device which is described as follows:
1 is a projector projecting an image in one portion of
the spectrum with light 2, which for example may be rich in the
ultraviolet or near blue portion of the spectrum. This light
source is of a relatively low intensity. The image is projected
upon a dipole screen generally indicated as 3, the operation of
which is described more fully in connection with Figures 2 and 3.
The projector 4 projects a high intensity light beam 5
through the cutoff filter 6. The function of the cutoff filter
6 is to eliminate the ultraviolet or near blue portion of the
spectrum from the light beam 5. The light beam 5 carries no
image. A complimentary light cutoff filter 7 is also placed in
front of the projector I so as to eliminate any light other than
the ultraviolet near blue light which is practically invisible.
The dipole screen is constructed as shown in Figures 2 and
3.
Declass Review by NIMA/DOD
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Referring to Figure 2, there is shown the condition of the
dipole suspension 10 in oriented state, normal to the plane of
the screen 3. A neutral molecule 11 is shown just prior to the
impingement of an ultraviolet ray 12. After absorbing the ultra-
violet ray 12, the neutral molecule 11 splits into positive and
negative ions respectively 13, and 14, which migrate to the faces
15 and 16 of the dipole cell under the influence of an electrical
field 17 shown in Figure 2.
After the ions 13 and 14 have moved to the cell walls 15
and 16, the electric field 17 is now shielded and the space
occupied by the dipole layer 19 is free of the electric field,
and the dipole particle 10 in Figure 3 is shown in its random
position. The relaxation to the random position occurs by Brownian
motion in the field free dipole layer 19.
Thus, in areas which are strongly illuminated by ultraviolet
light 12, the dipole particles are disoriented. In those areas
in which there is no illumination by the ultraviolet rays 12,
the dipole particles are oriented. If the dipole particles 10
are absorbing when disoriented and transparent when oriented,
and if the backing layer 20 has a white diffuse reflectivity,
then those areas which are illuminated will appear dark, and those
areas which are not illuminated will appear white as a result of
,the reflection of the secondary beam 5 from the projector 4.
Beam 5 carries no image upon incidence but will produce
ampl if ied, negative image of the projected beam from the projector 1.
Therefore, if a film 21 passing through the projector l is a
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amplifying screen 3.
Conversely, if reflective dipoles 10 are utilized and the
backing screen 20 is a black absorbing screen, then a positive
film 21 projected upon the screen 3 and illuminated by the
uniform light source 5 will reproduce an amplified positive image.
It will be understood that while the reflective system as
shown in Figure 1 requires that the observer's eye be at. position
24, that alternatively it will also be possible to utilize a
transmittance system where the observer's eye or camera may be
located in position 25.
II Work Program
The purpose of the work program will be to establish the
feasibility of the above concepts and to set up the equipment
essentially as shown in Figure 1.
Projectors 1 and 4 and the filters 6 and 7 are conventional.-
The dipole screen as shown in Figures 1 and 3 have also been re-
duced to practical hardware and are demonstrable at the, present
time and will exhibit a large area uniform change responsive to
an applied electric potential.
The work program will concentrate upon, therefore, the
study of suitable molecules illustrated as 11 in Figure 2 and
incorporated within the layer 19.
These molecules will be chosen
from well known photochemical species which are capable of being
split when subjected to ultraviolet light but which will recombine
in the dark.,
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Numerous such species are known and primarily include
transition metal halide salts or the acid halides which will
be dissolved within the dipole suspension in such quantity as
to be suitable for masking the electric field when illuminated-
by ultraviolet light, but which will recombine in the dark.
These studies will initially be performed in laboratory
cells and rate studies will be taken of the alignment and d i s-
alignment of dipolar materials in the presence of ions combined
and uncombined. The rate of disorientation of the dipole particles
will be affected by the concentration and the splitting apart of
the ions by ultraviolet light and the rate of orientation of the
dipoles will depend on the rate of recombination of these ions.
STATINTL The present equipment
which
includes a unique optical bench equipped with illuminating source,.
photosensors, logarithmic amplifiers and memoscope and camera, is
essential to the effective prosecution of this work and is already
available in operating condition and is presently being utilized
.part time on other projects. The necessary electrical equipment
is also available. Therefore, with only a relatively small ex-
penditure for chemicals and glass ware, we will be able to execute
this program with a minimum of delay and only a modest requirement
of the purchase of additional equipment.
The work is to be divided into two phases.
Phase 1 will include the studies of the dipolar photo-
ionic phenomena to establish the necessary parameters.
Phase II will comprise the construction and test of a
system, shown in Figure 1.
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The work on Phase 1 will continue for six months, but it
is hoped that at the end of four or five months progress will
be sufficient to make a demonstration based upon Figure 1.
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FIG. /
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