TECHNICAL PROPOSAL FOR AN EXPERIMENTAL ENGINEERING MODEL OF A DIFFRACTION VIEWER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001700010001-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 21
• Document Creation Date: December 28, 2016
• Document Release Date: April 23, 2001
• Sequence Number: 1
• Publication Date: February 21, 1964
• Content Type: REGULATION

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STATOTHR
No. 6074.01
Teclinica 1 Proposal
for an
Experimental Engineering
Model of a Diffraction Viewer
21 February 1964 Declass Review by NIMA/DOD
STATOTHR
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l.0 SCOPE
2.0 BACKGROUND
3.0 PHASE II TECHNICAL APPROACH
3.1. Scope 6
3.2 Required Project Developments
4.0 PHASE II PROGRAM PLAN 14
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Technical Proposal
for
Experimental Engineering
Model of a Diffraction Viewer
1.0 SUMMARY
STATOTHR
submits the following proposal for Phase II
of a program designed to substantiate the principles, utility, and
performance potential of a new class of rear-projection viewing
equipment based upon the phenomena observed when a direct image is
viewed through diffraction gratings. In the recently completed
Phase I of this program, the validity of the principles involved in
this class of viewer were established and the feasibility of obtain-
ing extremely high viewer resolving power without proportional
limitations on exit pupil size were demonstrated. In this, the
second program phase, it is proposed to apply the theoretical and
optical/mechanical principles derived from the breadboard of Phase
I to an experimental engineering model of a full size viewer.
The primary technical objectives of this second phase are to
derive the techniques for - and subsequently rule and replicate -
diffraction gratings commensurate with a full size viewer; to design
and fabricate the corresponding supplementary optics, support
structure and enclosures; and to assemble, align and test a complete
full size experimental rear projection viewer. Final performance
objectives are to obtain 50X magnification over a 10 x 10 viewing
area with an effective resolution at the object plane approaching
400 lines/mm.
To accomplish the various sub tasks in this effort, it is
proposed that the combined resources of
be utilized, with as the prime
STATOTHR. STATOTHR
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STATOTHR
STATOTHR
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contractor and acting as the focal point for all technical, con-
tractual, and liaison matters.
As described in the following sections, this second phase of
the program will span a minimum of 12 months (with a potential
maximum of 16 months depending upon grating development schedules)
and will culminate in the delivery and demonstration of the experi-
mental viewer, a complete second set of optics with gratings, and
an engineering report covering operation and maintainence of the
viewer, technical characteristics, and results of a performance
evaluation.
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2.0 BACKGROUND
STATOTHR STATOTHR STATOTHR
Early in 1963, supported by
as a subcontractor, received a contract to undertake Phase I
of a Diffraction Viewer feasibility development program. Phase I
of the program was to conduct the necessary theoretical and experi-
mental work required to demonstrate the feasibility of employing
crossed diffraction gratings as a primary technical method of over-
coming the limitation of small exit pupil size at high viewing
magnifications in a rear projection direct image viewer.
8TATOTHR The concept of using optical diffraction techniques to cir-
cumvent the physical limitation of exit pupil size resulted originally
from certain joint proprietary efforts between technical staff members
of These discussions subsequent-
ly resulted in the preparation of (1) a jointly owned company applica-
tion for a basic patent in the optical field and (2) a proposal for
the development of a new class of rear projection viewers using optical
diffraction techniques for purposes of photo interpretation.
On the basis of the proposal submitted, and follow-up technical
discussions with government representatives, sufficient interest was
developed and evidenced within customer circles as to result in the
placement of a contract for the Phase I effort.
The Phase I effort was initiated in the first quarter of 1963
and was completed in June 1963, with a physical demonstration of
STATOTH R
feasibility. Phase I produced both theoretical and experimental
study results (see Final Engineering Report No. 4001)
which confirmed the feasibility of high quality, high magnification
viewing of low contrast imagery using optical diffraction techniques.
These techniques produced a significant enlargement of the effective
size of the composite exit pupil over previously limited rear projection
viewing methods.
These study results also indicated that viewing magnifications
of the order of 50X could also potentially be achieved with this
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approach if certain advancements in the fabrication of high quality
diffraction gratings were practicable.
At the conclusion of Phase I, the decision to proceed with
Phase II of the intended development program rested almost entirely
on the state-of-the-art of manufacturing high quality diffraction
gratings. The specific characteristics of the diffraction grating
required for the intended application must be of such a nature as
to yield a nearly uniform distribution of light intensity over nine
(9) or more diffraction orders in conjunction with corresponding
blaze angle and period relationships compatible with continuous
high magnification (50X to 70X) direct image viewing equipment.
In the months immediately following the Phase I portion of
the current program, several meetings were held between contractor
and customer technical representatives to review and discuss poten-
tial technical approaches and plans for the Phase II follow-on
effort.
During these discussions, two distinct technical approaches
were examined relative to Phase II. One approach was based upon
slaving by electro-optical methods the exit pupils to the average
motions of the operator's head. The second, and more favored
approach was to pursue the use of diffraction grating techniques
through subsequent improvement in the state-of-the-art.
It was decided therefore that prior to any final decision
being made, a second optical demonstration of the viewer concept
would be conducted in conjunction with a review of the diffraction
grating fabrication technology. Concurrently, a review of U.S.
grating manufacturing sources was made that subsequently resulted
in the selection of as the company most qualified
to solve the diffraction grating problem. This decision was based
upon a history of prior work in the area of fabricating high
diffraction order gratings in connection with the Printing Industry.
The results of this prior work, and the development of new fabrica-
tion techniques since their initial attempts, produced the firm
STATOTHR
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technical conviction that the required grating was within the
limits of technology, even though gratings of the particular
characteristics had never been built.
At a contractor-customer meeting in December, 1963, it was
mutually agreed between customer representatives and representatives
STATOTHI rom that the
technical approach that would be pursued in the Phase II effort would
be based upon the use of high quality diffraction gratings. The
slaving concept was temporarily suspended pending the outcome of
Phase II developments.
The customer's technical representatives also directed that
the Phase II program was to provision for the fabrication of two
complete optical systems including the necessary diffraction gratings.
Of the two optical systems, one system would be assembled and used
in the experimental engineering model of the diffraction viewer for
photo interpreter evaluation, and the second unit would be held in
reserve in a non-assembled state for subsequent employment in a
prototype of an operational viewer.
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3. 1 Scope
The technical objectives of this, the second, phase of the
diffraction viewer development are to fabricate, test, and
demonstrate a full size experimental engineering model viewer
which, while not including such operational features as automatic
film transport, mensuration devices, etc., will contain all the
optical elements and optical performance of an operational viewer.
The unit will have the following technical specifications as
design goals.
/a. 50X magnification (fixed)
J b. A nominal 10" x 10" viewing area
,/c. The exit pupil area will be 3.5" square
minimum with minimum variation in illumination
to permit comfortable viewing from approximately
20" from a non-rigid position.
A minimum resolution of 200 lines/mm ( as
referred to a high contrast target in the
image plane) based upon available off-the-shelf
lens.
je. Accomodations for either 70mm or!,5" film chips.
In consideration of the experimental nature of the unit, and
in the interests of economy, the packaging aspects of the unit
(i.e. enclosures, main frame, etc.) will be held to a minimum
consistent with structural rigidity to maintain optical alignment
and reduction of stray light effects.
Technically, the proposed program will be divided into three
distinct development areas. The first of these concerns the steps
leading to the fabrication of the final 10" x 10" diffraction grat-
ing. As the required characteristics of the grating will require
certain advancements in the current art of grating fabrication, an
initial research effort will be required to determine the actual
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manner in which the grating should be ruled. This is principally
a function of how best to obtain the most even illumination from
each diffraction pattern order and requirements on exit pupil size.
Upon selection-of the optimum methods resulting from this
research, a series of small 2 x 2 inch sample gratings will be
ruled, both to prove the optical calculations of the research
effort and to verify the mechanical feasibility of ruling the de-
sired pattern. It is anticipated that a maximum of four distinctly
different trial gratings may be required before the performance goals
and fabrication techniques are sufficiently developed to permit
initiation of work on the final grating. With very favorable progress,
no more than two sample gratings may be required; although this can-
not be assured at the present time. With the specifications and
techniques of the proper grating once established by this method, the
final grating would be ruled and replicas produced for incorporation
into the final viewer. It is planned that the accomplishment of this
grating development be the responsibility of the
STATOTHR STATOTHR
The second principal development area in the program will
concern the design and fabrication of the more conventional portions
of the complete optical train in the viewer. Of principal importance
in this area are the condensing lenses, objective lens, field flat-
teners, and the large diameter field lens which just precedes the
grating in the optical train. It is planned that this activity be
STATOTHF'he responsibility of
The third and final developmental area in the program is the
structural portion of the viewer. This includes the various require-
ments for mounting the optical elements, the viewer housing, the
light source, etc. The design and fabrication of these elements, and
the overall integration of the optical elements into the viewer will
STATOTHRbe the responsibility of
The final outcome of the three foregoing areas will be the
proposed full size viewer with performance characteristics as listed,
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and, in addition, one complete extra set of optical elements. This
extra set of elements may either be delivered and used by the customer
for special purpose research or retained for later incorporation into
a final version of the viewer with full operational viewing and men-
suration capability.
While the foregoing summarizes the general scope of the program,
there are a number of individual points of interest which are useful
to a more thorough appreciation of the technical complexity of the
viewer development. These are contained in the following sections.
3.2 Required Project Developments
a. Diffraction Grating Development
STATOTHR
proposes a three phase grating
development program whose goal is to achieve a special ten inch by
ten inch aperture diffraction grating master. The four replica
gratings produced will be substantially identical. They will be so
designed that the energy incident on the grating will be divided
into nine equally intense orders (the zero order, and the first four
orders on both sides of the Zero order). "Equal intensity" will
be taken to mean that the variation in intensity between adjacent orders
will not be more than 40 percent, and the overall intensity ratio
amoung all orders will not be over two to one.
In the initial research effort the method of meeting these re-
quirements which is most probable of success within the total contract
time will be determined. The principal problem in producing such a
grating is the problem of achieving the desired energy distribution.
A number of methods for realizing the desired characteristics are
available. The more promising of these are based upon one or more
of the following approaches.
1. Groove Shaping
That shape of the groove is determined which will produce
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a grating of the required energy distribution. If such a groove
is a portion of a circular cylinder the shape is realizable. If a
different shape is called for then the task will be more d?fft J-t
and thus more time consuming. Some theroetical investigations of
cylindrically shaped grooves have been carried out,
but only limited experimental background exists.
2. Ghost Grating
A grating with such periodic error is produced that the two
first orders, two ghosts on either side of each first order, and the
zero order all have equal intensity (eleven images in all). The
advantage of this kind of construction is that the groove structure
is finer (approximately 3000/inch) and hence less visible. The groove
would be required to also have the correct shape as well as having an
appropriate periodic error.
3. Double Grating
It may prove to be more simple to make two gratings, each of
which has two first orders and a zero order of equal intensity. Two
such gratings with parallel grooves would produce five approximately
equal orders. Four gratings in all would be required and alignment
between the two parallel gratings would have to be quite exact.
During the initial studies still other methods may occur.
These will also be evaluated on the same basis, i.e., the probability
of achieving the desired end result in the allotted time. At the
conclusion of this research phase a report will be issued presenting
the most suitable method to produce the required diffraction gratings.
Following determination of the method judged most probable
of success, a two inch by two inch sample diffraction grating will be
fabricated. A transmission replica of this sample grating will then
be made and the relative intensity of the various images will be
measured.
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Measurements will be conducted using the 5461 mercury line with
collimated light incident normal to the unruled side of the grating.
A telescope and detector will be angularly scanned through the orders
of the grating and the relative intensity of the orders determined.
Two replicas and the measurement record will be delivered. It
is unlikely that the first of these rulings will produce replicas
having the finally desired degree of energy distribution. Therefore
an additional part of effort will be to rule a second two by two inch
ruling embodying the knowledge gained from the first. Transmission
replicas from this second grating will be measured and the replicas
and measurements also delivered. Subsequent two by two inch gratings
will be ruled and replicas submitted as required.
It is probable that a total of four attempts will be required to
achieve the desired level of performance. he results of these trials
will then be used to produce and deliver the final 10 by 10 inch
transmission replicas to the nominal specifications already stated,
and in detail as mutually agreed on.
b. Optical System Development STATOTHR
'00' STATOTHR The design and development of the optical system for the
experimental diffraction viewer will be performed by
Optics will be built for two
complete optical systems with individual elements being assembled and
checked only for the experimental engineering model during the present
phase of the program.
A total complement of optical elements in an individual viewer
system includes the following:
1. Two multi-element condensers mounted in cells.
2. Two field flatteners unmounted.
3. Two commercial high aperture photographic objective
lens with modified cells containing adjustable
square pupils.
4. Two multi-element 15 inch diameter field lens
systems mounted in cells.
ens will be designed to.concentrate the light from
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from the lamp to a very small area on the film plane. At 50X the
object scene is .2 x,2 inches and thereby requires a concentration
of the lam output to. h m
all are for eff en1 o tip
ka--J t t by a'
The objective lens will be a commercially available unit specially
selected for the purpose. It is anticipated that a lens with an
AWAR of 250 l/mm (as referred to a high contrast target in the image
plane) can be obtained. The lens will be capable of 400 1/mm on axis,
and approximately 100 1/mm toward the corners of the field. It will
have a focal length of approximately 1 inch, and a focal ratio of
f/1.0 or faster. If in later viewer models it is desirable to achieve
the full 400 1/mm capability, a new lens design will be required.
The field lens will necessarily represent a new design. This unit
will employ conventional glass and have four (4) major elements with
an overall diameter of approximately 15 inches. The lens is of
symetrical design and therefore affords the possibility of placing
STATOTHRie diffraction gratings between two identical element sections if
required. Coordination with in
this matter will determine the mounting arrangement of the four elements.
In addition, certain aspects of the optical system design are
dependent upon the grating approach, their interface items will be
determined after the receipt of contract.
c. Viewer Mechanical Development STATOTHR
In parallel with the diffraction grating development and
the design and fabrication of the optics, will design and
fabricate the optical support and viewer body components. One month
STATOTHI fter the optical design is begun will be supplied with
drawings showing the relationship of the optical components and their
STATOTH Rhysical dimensions. After the receipt of this document,
ill d
i
d f
b
i
h
i
w
es
gn an
a
r
cate t
e v
ewer body. Due to the nature of the
viewer and its intended use, the design goal will be to provide a
clean simple optical support, film holder, illumination assembly, and
protective cover. A more detailed description of each subassembly
is given below.
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 The optical bed will consist of an H frame mounted on rubber
feet. All of the optical components will be mounted on this H frame.
The upper surface of the H frame will be machined to provide a common
plane for alignment of the optical elements.
1. Optical Element Support Assembly
The 1" Fl objective lens will also be attached to the H frame
bed but will be focusable from the front of the viewer. With the
high resolution and low F# of the system this is a desired feature.
A simple cam mechanism will be used to provide the actual focusing
movement.
The 15" field lenses will be rigidly mounted to the H frame
support. A front plate with the proper size opening for the grating
will cover the field lenses and also support the few front controls
required.
A wooden or sheet metal cover will be fabricated and fixed to the
frame to cover the assembly. A section of the latter portion will be
hinged to allow access to the optics and for insertion of film and
X--Y adjustments.
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ST~j,TOTHR
2. Light Source and Condenser Optics
will provide the light-source and its power
--- --- - - --- ---
supply, The wavelength selection will be jointly determined at the
first technical liaison meeting. An external blower with a flexible
air duct will be supplied for cooling. The blower motor and fan
assembly will be packaged with the illuminator power supply in a separate
container. This form of external mounting will eliminate vibrations
which would be magnified by the 50X power optical train.
The condenser optics will be placed at a fixed location to
concentrate the lamp output to the small area on the film as set by
the magnification ratio.
3. Film Support and X-Y Translation
The film su ort structure will accomodate both 70mm and
5 inch film chi s no provision will be made for roll films).
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The film will be held b a vacuum to a flat glass plate through the
use of etched grooves in the glass. The groove pattern will cover a
full 70mm format. When a 5"-square film chip is used, any 70mm
square section of the forma ,.
The glass platten will be mounted on a simple X-Y tran latioh
mechanism to allow the required object field to be selected anywhe]
within the 70mm format. The movement of the film will be performed
by simple manual controls.
Besides the viewer a second small enclosure will be required.
This will contain the light power supply, blower, and vacuum pump. The
vacuum line and power cord will follow the air duct from the enclosure
to the viewer to provide a neat appearing interconnection. An air valve
will be located at the rear of the viewer to control the vacuum for
installing and removing the film.
STATOTHR Subsequent to the fabrication of the viewer body, and after the
arrival of the optics at all viewer components with the
exception of the grating will be assembled and checked out. Even
though the grating is not available the unit can be aligned and tested
=rr and the resolution tested by observing imagery through the one .4 inch
exit pupil which will exist without the grating. The illuminator
level may be simulated by insertion of a neutral density filter in
the system which will cut the light by the amount expected with the
grating. Alignment and focus checks will be made as well as
functional tests with film samples.
After the gratings are available a minimum amount of time will
be required to finally check out the viewer. A final brightness
variation check of all 36 exit pupils will be made after installation
in the viewer and the resolution obtainable from each exit pupil
determined. These findings, along with other technical material will
be included in the final engineering report.
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4.0 PHASE II PROGRAM PLAN
As previously indicated, the development of the experimental
STATOTH Rengineering model viewer will require the combined research talents
STATOTHR of Overall
program direction would be the responsibility of
STATOTH
su o ti
r
b
ATOTHR capacity.
ST
pp
ng in a su
contract
would also serve as the focal point for all
customer related functions such as reporting, liaison, and such
other administrative and/or contractural matters as may be required.
This need for a single focus for all program activities becomes
particularly evident when the relative phasing of the individual
company sub tasks are considered. These various interrelationships
are illustrated in the Phase II Program Schedule of Figure 1
As
.
STATOTHRind icated both
0 would be required
to initiate separate laboratory and design studies simultaneously
upon completion of satisfactory subcontract coverage. Upon completion
STATOTH Rof these initial efforts would then proceed with the
STATOTH Rfabrication of a series of prototype 2" x 2" gratings while
STA THi fabricates their selected lens design and begins
S.TATOTHRdesign and fabrication of the viewer body. These latter functions
STATOTH Rare coordinated through the delivery of the optical system component
physical specifications to
The integration of the optics into the viewer, and all subsequent
alignment and fit problems will be considerably more complex than
those associated with the integration of the grating, the schedule
therefore indicates a viewer body/optical element pre-assembly and
checkout period. Even though the final grating may not be available
for three (or up to seven months), valuable information can be developed
relative to the final viewer's optical characteristics and potential
performance during this period.
Upon receipt of the actual grating the final assembly and test
of the viewer will then be conducted and an evaluation of the overall
performance of the viewer completed.
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(Phase II)
Initial liaison to confirm scope and
specifications
Formalization
contracts =
Evaluation of
techniques ?
of tests and sub-
I
grating fabrication
? STATOTHR STATOTIR
Fabrication of prototype gratings
Delivery of prototype replicas 1
Design and fabrication of optics
Delivery of optical component
specifications
Design of viewer body
STATOTH~
STATOTH
STATOTHR
Fabrication of viewer body
STATOTHR
Viewer body/optics assembly and
alignment ~ STATOTHR STATOTHR
Fabrication of final grating
Grating installation and alignment
STATORH
erformance test of completed viewer
P
Demonstration of
STATOTHR
HR
Engineering report Phase II
Customer/Contractors Coordination
Meeting
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Following this final period of overall viewer evaluation by
essentially all parties concerned, the viewer would be delivered
and a short indoctrination session held to familiarize the customer
with the units characteristics
F
t
.
or cus
omer convenience this
..r meeting could be held at the facilities of inSTATOTHR
if desired.
As the proposed program may be expected to span a minimum of
12 months from contract go ahead to delivery of engineering report,
it is proposed that quarterly progress reports be prepared and
deliverable one week after the close of the 3rd, 6th and 9th months.
In addition the conclusions resulting from the scheduled liaison
meetings between contractors relative to program direction would be
reported separately within one week, e.g., the initial meeting to
confirm specifications and contractural arrangements, the commitment
to proceed with the final grating based on the latest prototype
STATOTHWrating fabrication, etc. In order to minimize project travel costs,
a
s consented to serving as the Host for the scheduled
liaison meetings. These meetings therefore, are scheduled to be held
in at the times shown in the project schedule.
STATOTHR
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Item Quantity Description
1 5 Technical Meeting Reports
Letter type
2 5 Quarterly Progress Reports
3 1 Experimental Engineering
Model of 50X Diffraction
Viewer
4 6 Engineering Reports of
Operating and Service Instruc-
tions, and Design Data
5. 1 Complete Optical Systems (non
assembled) including gratings
Within 7 days after
each technical liaison
meeting
Within 7 days of the
close of the 3rd, 6th
and 9th months ARO
A minimum of 12 month:3*
ARO
Concurrent with delivery
of Item 3
A minimum of 12 month:3*
ARO
* Twelve (12) month delivery date is based upon the early
development of a successful grating. A sixteen (16) month
delivery date will result if four complete diffraction grating
technique fabrication trials are required.
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STATOTHR
= No. 6074.01
Cost Proposal
for an
Experimental Engineering Model
of a Diffraction Viewer
21 February 1964
STATOTHR
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 STATOTHR
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