LETTER TO GENTLEMEN FROM (Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A003200010041-8
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 21
• Document Creation Date: December 28, 2016
• Document Release Date: May 6, 2003
• Sequence Number: 41
• Publication Date: January 16, 1964
• Content Type: LETTER

STAT
STAT
STAT
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SPECIAL HANDLING
Gentlemen:
COR-AS7b-
COPY Gq OF
SHC64-9051-24
Copy #
16 January 1964
leased to submit this proposal for changes under the basic
Contract Task Order #6, in accordance with the work statement
cited in ect on I for the consideration cited in Section II of the
attached proposal.
This proposal constitutes' 'formal bid for a retrofit system
that will adapt the Gamma I Rectifying Printer for automatic electronic
dodging, thus expanding the present operational capabilities of the printer.
Our prices do not contain federal, state, or local taxes,.as none
are believed applicable. Furthermore, the above prices do not contain a
price or charge for royalties in excess of
STAT
Further, the prices found in this proposal are predicated on the
following terms, conditions, and contract considerations:
1. The F.O.B. point for all items is and STAT
costs for delivery, as directed by the contracting officer to
points other than the stipulated F.O.B., will be handled in
accordance with the Changes Article cited in the contract.
2. That final acceptance testing of instruments will be conducted
at contractor's plant; installation costs for equipment at
location other than Washington, D.C., which may result at the
request of the contracting officer, will be handled under the
changes article of the contract.
3. The prices shown in Section II are valid for a period of 45 days,
after which time reserves the right to amend.
Declass Review by
N I MA/DOD
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4. That your activities will issue a CPFF Contract substantially
in accordance with ASPR and AFPI provisions as presently cited
in the basic Contract Task Order No. 6.
Executed copies of the Contingent Fee Statement and Certificate of
Current Pricing will be forwarded at a later date.
Should you require any further information regarding this proposal,
do not hesitate to call upon us.
HAM/mm
Very truly yours,
Contracts Manager
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Proposal 3501.01
Retrofit Gamma I Rectifying Printer
with Electronic Dodging
1. Introduction
This proposal presents the combined approach of AMS,
for the design and fabrication of a
retrofit system that will adapt
the Gamma I Rectifying Printer for automatic electronic dodging. The purpose
of this system is to expand the operational capabilities of the existing
rectifying printer.
The proposed electronic dodging system will not eliminate the existing
light source but will be in addition to it; that is, each light source will
be designed to facilitate assembly to the rectifier and either may be employed
according to operator discretion. In this manner, the inherent advantages
of both light sources will be preserved. The present means of controlling
the light source sweep motion and the function of all controls not pertaining
directly to electronic dodging will remain unchanged.
A technical proposal for the electronic components necessary for auto-
matic dodging was submitted to
phase of the system to
It is our intent to sub-contract this
ecause of their extensive experience in
automatic dodging. This will result in an operational system in the shortest
time commensurate with the lowest costs.
will be responsible for the mounting of the components
to the Gamma I instrument, liaison with the sub-contractor to insure compliance
with the specifications, and testing and debugging of the integrated system.
2. Description and Operation
2.1 General
Figure 1 illustrates the arrangement of the components to accomplish
automatic dodging. The cathode-ray tube and its yoke will be mounted to the
scan arm in place of the conventional light source. The illuminated slit will
be projected through the projection lens to the front surface of a beamsplitter.
The beamsplitter will reflect 907 of the Light to the printing plane and allow
10% of the light to pass through the beamsplitter.
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1C1141 HARIOLIN,
A front surface mirror, an opE1 glass diffuser, and a photomultiplier
tube will be affirred to the scan arm so that they will be behind the
beamsplitter and the Ohotomultiplier entrance pupil will be coincident with
the entrance pupil of the lens and the slit.
The instantaneous value of light transmitted from that portion of the
negative illuminated by the flying spot will be sensed by the phototube and
the velocity of the spot will be varied proportionately to provide velocity
modulation dodging
A detailed explanation of the principles involved is included in the
proposal. (See Appendix)
2.2 Operation
The rectifying printer will be operated in the same manner as with the
conventional light source. The initial settings of line speed velocity and
end point control will be accomplished on the control unit and
then the operational controls of the printer will be used to determine total
exposure time.
2.3 C-R-T and Yoke Connections
The conventional light source consists of a 500-watt pre-focused projec-
tion lamp and a fan for cooling of the lamp. The wires that service these com-
ponents terminate in a releasable connector and receptacle. When the ligat
source is removed, the connector need only be released and the power source
will be dead-ended in the receptacle. This arrangement allows the conventional
light source to be re-installed with minimum effort.
The wiring of the power source to feed the cathode-ray tube and the
deflection yoke will be installed in a similar manner for ease of installation
and removal.
2.4 Beamsplitter
The folding mirror used in the existing design is a front-surface mirror
that has been highly polished to a flat surface and over-coated to provide a
nearly 1007 reflective surface. The rear surface of this mirror is parallel
to the front surface, but it has not beenpolished from the rough ground con-
dition.
It will be necessary to rework this mirror into a beamsplitter. The
quality of the glass must be checked for inclusions or defects that could
be detrimental. If the quality is satisfactory, we will have the reflective
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coating stripped and have the rear suFface polished flat and parallel to the
front surface within close tolerances.
2.5 PhotaEultiplier Tube Hounting
The photamultiplier tube will be located in a position to the rear of
the,beamsplitter. In order to accomplish this, it will be necessary to fold
the transmitted illumination path by inserting a front surface mirror between
the beamsplitter and the phototube. An opal glass diffuser will be mounted
between the mirror and the phototube to allow satisfactory sampling.
These components will be rigidly mounted with respect to each other and
the sub-assembly will be firmly coupled to the scan arm such that the entrance
pupil of the phototube will always be in line with the exposing slit.
2.6 Counterweight
A counterweight is attached to the lower section of the scan arm to
balance out the dynamic effect of the moments of inertia of the lamp housing
during scan so as to provide a smooth motion. It will be necessary to design
another counterweight to act in conjunction with the phototube and the cathode-
ray tube to provide the proper balance.
3. Interface Conditions
3.1 Cathode-ray Tube
Consideration must be given to the physical location of the cathode-ray
tube with respect to the spacing between the film plane and the faceplate of
the tube. would like to have the faceplate of the tube spaced
approximately .031 inch from the film plane so as to keep the spot size from
becoming too small and burning the phosphor of the tube. This would also
allow the elimination of a physical slit.
The present mechanical configuration of the printer does not physically
allow this close spacing. It will therefore be necessary to:
a. Investigate types and sizes of tubes other than that mentioned in
the proposal.
b. Investigate the inclusion of condenser optics between the film plane
and the CRT.
3.2 Control Console
will supply the necessary electronic chassis and power
supplies housed within a 18 1/2 by 26 1/2 by 14 1/2 inch cabinet (height,
width, depth). The unit will weigh approximately 75 pounds.
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provide the necessary interconnecting wiring and cabling to facilitate the
replacement of either light source.
3.3 Overseen
STAT The engineers feel that is is desirable to have a clear
distance between the edge of the format and the edge of the film support
of a least 0.100 inch each side of the film. This is desirable to provide
optima n blanking of the flying spot so that the halo effect provided by the
phospher persistence and the light scattering within the glass faceplate of
the tube will not provide incorrect signals to the phototube. From preliminary
? layouts, it appears that it would be unwise to increase the platen opening
to allow 0.100 inch spacing between the format edge and the support. There-
fore, it is difficult to predict the boundary effect that this will have on
the output print, Tests will be conducted at final assembly to determine
what effect the reduction of film support area will have on the flatness of
the film plane. The results of these tests must then be evaluated and compared
against the photographic results desired.
3.4 Output Qualilx
The quality of the output film with respect to image and resolution
?
be held to the hi
f., 111
est starlards. Because the output resolution is dependent
upon the slit width, and because the CRT trace width has not been determined,
it is presently urkuown if a slight resolution degradation will occur.
Preliminary indications are that if the CRT trace does not exceed 1 1/2 wm,
then the present resolution values will remain.
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STS
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SPEC
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ADAPTATION OF AUTOMATIC DODGING
AND EXPOSURE CONTROL
TO THE 'RECTIFIER
- A Technical Proposal -
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SPOCPAL
IA ND
LUNG
ADAPTATION OF AUTOMATIC DODGING AND EXPOSURE CONTROL
TO THE RECTIFIER
-A Technical Proposal-
SUMMARY
By modulating the velocity of the spot on a cathode-ray tube, a
dodging light source may be substituted in the 'rectifier
without modification of the present means of controling the light source
motion. Using edalist F-4 paper (five meter-candle-seconds),
the exposure time is estimated at 50 seconds; exposures on type 5427
would be shorter, depending primarily on processing. Exposure time
with this basic system would be the same for any negative.
A brief discussion shows that in an "advanced" system, derived from
this basic one, exposure time could be shortened to an estimated 14
seconds on Medalist F-4 when using an average negative. The advanced
system would require complete integration of the dodging control and the
light source traverse control.
APPLICATION
General
The description of the rectifier may be over-simplified
by saying that it divides the negative into a large number of narrow
strips and exposes the strips sequentially while adjusting the projection
system to conform to the Scheimpflug condition, thus restoring vertical
panoramic photography to Cartesian co-ordinates.
In the practical instrument, the negative is curved cylindrically with
the lens between the concave side of the film and the flat paper. The
region of negative exposed at one time is limited by a slit at the nega-
tive, parallel to the axis of the cylinder. As the slit is moved around
the circumference of the negative cylinder, the lens is tilted so that a
plane, tangent to the cylinder at the slit, intersects the lens plane and
the paper plane along a single line, preserving sharp imagery.
1. For clarity and simplicity the term "negative" is used for the
transparency (object), regardless of whether it is photographically a
positive or negative. Similarly, "paper" will be used to refer to the
photosensitive emulsion in the image plane, regardless of whether the
final support is paper or film.
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Rectifier Parameters
SPMAL HAMOr
In subsequent discussions of exposure times, line (slit) widths, etc.,
the following rectifier parameters are assumed:
Lens
Focal length F 11.65 inches
Relative aperture N f/4.0
ngnification, lens plane parallel to paper
? ? _ .
M
Angular motion of slit 0
Maximum
? max
1.875
+40 degrees
ke_gative
Nominal size 70 mm.
Image width 2.25 inches
Image length 25 inches
Eppsing,slit 1 by 57 mm.
It is further assumed that the only motion of the lens is angular and
that the axis of the negative cylinder is at the lens.
411 q>R2sure UniformiV,
As the exposing slit moves around the negative cylinder, the illuminance
at the paper varies as a function of the lens-paper distance, the angle
of incidence on the paper and the projected area of the exit pupil of the
lens. To maintain constant exposure with a conventional, constant
brightness, light source, the rate at which the slit travels is varied
as a function of the slit position.
BASIC APPROACH
2Rtical Arrangement (Pigure 1)
_
Li ht Source. Use of a cathode-ray tube as a dodging light source
requires a line scan, which may itself replace the exposing slit. The
second direction of scan is formed by moving the tube in the same manner
as a conventional light source is moved. The cathode-ray tube is
normally defocused in dodging printers to permit higher brightness;
high definition is unimportant since detail is transmitted optically.
SPECP 111.N,979,171,
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SPT'C AP ff_,:\n`l NV1
Use of a type 5WP11 or similar flat faced tube, normally defocused for
dodging, will produce a line width which will concentrate most of the
luminous energy in a 1 mm strip of negative, if the outer surface of the
faceplate almost touches the neg tive.
Use of a physical slit would probably entail adjustment difficulties:
If the trace ware not aligned with the slit it would be difficult to see
what corrective measures to take. Once adjusted, stability of trace
position would probably be primarily limited by mechanical stability of
the yoke mount.
Phototube. The entrance pupil of the phototube must correspond to the
entrance pupil of the lens, otherwise the unsharp mask on the cathode-ray
tube will not be in register with the image on the negative. Normally
the pickup to the phototube is made between the negative and lens using
a pellicle and a suitably positioned phototube aperture. The luminous
flux density through such an aperture is greater than at any point below
the lens.
STAT The optical path in the rectifier is already folded between
lens and paper; since introduction of additional optical elements is
undesirable, this mirror may be selected to transmit, y, 10 percent of
he incident light to the phototube. If the phototube is coupled to
the exposing slit so that it is in line with the slit and the lens, a
simple opal glass diffuser between the mirror and the phototube should
allow satisfactory sampling.
Basic Dodging and Exposure Control System.
Either of two types of dodging can be used in this application: d-c
intenaty modulation or velocity modulation. With the former, the spot
brightness at the cathode-ray tube is adjusted as a function of the
negative transmission so that the illumination on the phototube is
maintained at a constant predetermined value. The densest dodging
element which can be properly printed corresponds to the brightest value
which the spot can assume; if dodging is required in denser regions,
the tube must be made still dimmer in the thin regions.
Velocity Modulation. (Figure 2) With velocity modulation dodging, the
spot is moved at a speed instantaneously proportional to the transmission
of the portion of the negative illuminated by the spot; the time to scan
a line is proportional to the average opacity of the line. Since the
cathode-ray tube is always at its brightest, it is apparent that the
exposure time of a line can never be greater than with intensity modulation;
usually it will be substantially less. Velocity modulation offers the
greatest potential in ultimate performance and is simpler in terms of
equipment.
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Second Axis Control. The second scanning axis is normally analogous
to a mechanical ratChet and pawl; after each velocity modulated scanning
line is completed, the spot is moved down to the next line. Line
spacing is independent of scanning time required by the dodging axis.
Since the mechanical second-axis-scan of the rectifier STAT
cannot respond in the required staircase (step) function, some other
technique must be adopted to make line spacing independent of scan period.
One such means is to assign a suitable maximum scan period and start a
new line after each such period has elapsed. The spot would be blanked
after the completion of each line and unblanked at the start of the next
period starting the next line.
The maximum scan period must correspond to the greatest anticipated
average opacity expected in a single line, resulting in rather inefficient
use of the cathode-ray tube for thin negatives. Techniques to use the
light source more effectively will be discussed at a later point. Such
techniques, however, involve close inter-relationship between the m anics
of the rectifier and the dodging control, whereas the maximum-scan-period
technique minimizes these inter-relationships and makes use of the existing
method of compensating exposure by variation of light source speed.
Run-stop and Auxiliaries Functions. A pair of limit switches at the
ends of recliner motion would blank the cathode-ray tube before the
411 start and at the end of the exposure; during recycle of the mechanism,
the tube would be held off by a run-stop flip-flop or holding relay.
A control to stop the rectifier travel in mid-position (exposure axis
perpendicular to paper) must be provided to permit checking scan length.
If this position can be established precisely enough, the trace position
and angle can also be checked and adjusted, using a reference line on
the easel.
Anticipated Characteristics and Performance.
It is difficult to estimate performance in terms of Itype 5427 film, STAT
unless precise data are available on processing, sensitometry to a Pll
phosphor, and equivalent printing density. (The equivalent printing
density (epd) is the print density which is obtained when a printer with
automatic exposure control is first calibrated subjectively using a
negative and is then used to make a test print with no negative. For
paper prints the epd is about 0.6.)
The following estimated data, based on
---jMedalist F-4 paper may be
used as a basis for finding performance on o er materials.
Spacing, crt faceplate to negative 0.031 inch
Effective phosphor to negative distance 0.178 inch
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SPECIIAL NIALAILI,M7
ds
Spot size at phosphor
Effective spot size at negative
Scanning density at negative, minimum
Ds
Scan overlap, minimum
Minimum scan period to
*Maximum scan period,
Average line opacity = 25 t25
Exposure
*Exposure time,
Average line opacity = 25 T25
.011 inch
.040 inch
4.6 lines/mm
117.2 lines/in
78.4 percent
0.5 milliseconds
12.5 milliseconds
5 meter-candle-
seconds
50 seconds
The exposure time with this basic system will be the same for all
negatives. It is assumed that the scan line replaces the slit;
incorporation of a physical slit will probably increase exposure time.
Exposure time and maximum scan period (*) are based on an assumed value
of 25 for the average opacity of the negative across any scanning line;
exposure time is proportional to the largest average opacity of any line
on any negative. Measurement of the average opacity of 148 vertical
aerial negatives (entire negative) yielded a maximum opacity of 18 for
the worst negative; only 5 percent exceeded an opacity of 16. No
corresponding data for single lines are available.
Thus, while aerial film may have opacities of 200 or greater (density 2.3),
in practice the extreme values seldom occur over an area the size of the
scanning spot and a substantially lower value of opacity may be assumed.
The above exposure time estimate does not allow for variation in the
projected area of the lens exit pupil with cathode-ray tube position. This
factor should have little effect in view of the low precision of the average
opacity estimate.
cperation.
The operator will not use the controls on the dodging control unit in
routine printing. The exposure cycle will be started and the rectifier
recycled by operation of the presently used rectifier controls. Controls
and indicators on the dodging control unit will be used only for adjustment
and for indication of operation.
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Electronic raster adjustment controls will provide for (1) independent
adjustment of each end of the scan length, (2) rotation of the scan to
make it parallel to the axis of the negative cylinder and (3) positioning
the scan in a direction perpendicular to spot motion. Exposure will be
independent of scan length.
An exposure mode switch will permit turning the cathode-ray tube on for
such adjustments. It also will select either automatic dodging with
exposure control or no dodging with manual exposure control.
An exposure end-point control will select the maximum scan period (scan
110 repetition rate) in terms of the maximum dodging opacity for the worst
line. This control, in conjunction with the present control for the average
speed of the light source, will determine the actual exposure level.
?
The percentage of time the cathode-ray tube is turned-on will be indicated
by an exposure efficiency meter, calibrated in percent. This meter will
be particularly important in establishing the setting of the exposure end-
point control during initial calibration. In addition, a fault indicator
will light if the end-point control is adjusted for too low a value of
opacity.
Other Bata.
Construction. The control unit will be housed in a 18-1/2 by 26-1/2 by,
14-1/2 inch cabinet (height, width, depth). Estimated weight is 75 pound&
Where practical, electronic sub-assemblies will be constructed on plug-in
modules such as that shown in Pig. 3. General construction shall be to
best commercial practice.
Power Reqpirement. Power consumption at 117 volts (60 cycles) will be
200 wattsor less. Performance shall be unaffected by variations in input
voltage from 105 to 130 volts.
Manual. Instructions to commercial standards will be provided for
adjUaggnt of the installed control; maintenance instructions shall include
block diagram theory, detailed explaination of unusual circuits, schematic
diagrams, and component location diagrams.
m4nua1_mili_le_xamid0, since this must be
incorporated in o e operating manual for the entire instrument.
ADVANCED APPROACHES
The basic system outlined above has two distinct disadvantages: (1) it
does not permit shorter exposure times for thin negatives and (2) the
actual exposure is a function of the setting of two controls: the existing
traverse speed (motor) control and the exposure end-point control.
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Variable Ex-)osure Time.
_
57
Both these disadvantages may be overcome by using the dodging control to
establish the instantaneous traverse speed of the light source, while also
maintaining the desired line spacing, In essence) successive sweeps
would be triggered as a function of traverse motion, rather than at a
constant rate. Either the sweep frequency or the blanking duty cycle would
then be used to control the traverse motor speed causing
it to run faster
for thin negatives.
Traverse motion could be measured by any of several techniques, such as
a moire pattern detector or other photoelectric incremental quantizer,
Compensation of exposure for variation of the lower conjugate and angle of
incidence on the paper could be performed either by using varying line
spacing, based on the properties on the motion detector, or by introducing
the correction factor into the spot velocity control. The latter techniqueolP0
has been used successfully in the E-16 control (for the STAT
autofocus rectifier) to correct principle axis exposure over a 5.8
to 1 magnification range,
Estimated Performance..
The exposure time for such a control system would be very nearly
proportional to the average negative opacity for the entire negative. In
the sample of 148 vertical aerial negatives referred to earlier, the
average negative corresponded to a printing opacity of 6.9. This would
give) for an average negative, an exposure time of approximately 14 seconds
on Medalist F-4, shorter on type 5427.
Further) the likiihood of bars on the print caused by irregular motion
of the light source would be minimized, as exposure uniformity would be
independent of time. While a new instrument may work very smoothly and
show no tendency to produce bars, poor maintenance and accumulated dirt
will eventually cause irregular movement and banding.
Finally, the operator would be relieved of using two factors in determining
exposure level; a single exposure index control would set all parameters.
,2plication?
There are at least Three methods of obtaining line start signals from the
rectifier, two methods of exposure compensation and two traverse speed
control techniques. Selection of the optimum system for this application
requires, then, that one person Of group become intimately familiar with
both the rectifier and electronic dodging. Lacking this multiple discipline,
it would be premature to give a detailed proposal for the advanced system
at this time,
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