(Sanitized) PROGRESS REPORT DECEMBER 1966 - PROJECT(Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A003000050025-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 7
• Document Creation Date: December 28, 2016
• Document Release Date: August 2, 2002
• Sequence Number: 25
• Publication Date: January 25, 1967
• Content Type: LETTER

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25 January 1967
Subject :
Progress Report
December - Project
Project
LHB/aw
Enclosed is a copy of
Progress Report on
for the period December 1966.
Also included is our Financial Report for this period.
Very truly yours,
Encl: (1) P. R.
(2) F. R.
Declass Review by NIMA / DoD
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GROUP
XCI UDff FROM AUiOMAM
DOWNGRADING ANO
DECLASSIFICATION
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Period Covered:
A. PRESENT STATUS
The equipment to ready for delivery with
exception of final inspection by Quality Control 25X1
Department. Photographs # 867, 868, 866, and 870 are included
showing various views
A solution to the lamp flicker problem has
been found and appropriate changes in the equipment made. The
approach of attempting to isolate the lamp and noise producing
circuits by electrical filtering proved unsuccessful. The component
of the noise found to be the trouble source was identified as a
low frequency distortion of the input waveform due to relatively
high, short duration, current surges in the motor control circuit.
This harmonic distortion of the input wave form could only be
eliminated by separating the sources of input power to the lamp
and motor control circuit. Filtering of this distortion was ruled
out because of the large, heavy, and expensive equipment which
would have been necessary. The manufacturer of the dimming circuit
was approached for possible solutions. Filtering circuits were
supplied and also a slightly different dimmer design, however this
did not improve the situation. When all promising avenues to the
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solution had been attempted, we found it necessary to design and
fabricate a new dimming circuit which was insensitive to lamp
flicker. This was done on a crash basis since this problem was
delaying both completion. The final circuit selected
uees a solid state switch Iwhose turn-on signal is
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controlled by an SCR driven by a unijunction transistor. Lamp
intensity is controlled by varing the period of time (or phase
angle) the 115 volts is applied to the transformer primary during
each half'cycle. This is similar to the method used in the original
dimmer however the important difference is in the method of trigger-
ing the solid state switch. In the original switch the trigger
25X1 circuit was sensitive to voltage variations on the line; in
..r the circuit this sensitivity is eliminated by operating the
trigger timing circuit from a zener diode controller reference.
In addition the new circuit has provision for the changing the
turn-on phase angle in a direction which compensates for the reduced
voltage being supplied to the load due to wave form distortion.
Some difficulty was experienced in achieving the required dimming
range without lamp flicker (due to the lamp's normal instability
when operating at the low and of the brightness range). It was
found that better performance resulted when a load resistor was
placed across the primary of the high voltage transformer at the
low end of the dimming range. Since it was not practical or desire-
abltn_to keep this resistor (artificial load) connected across the
load for the bright lamp settings (because of excessive power
dissipation - and instrument temperature rise) a means had to be
found to automatically remove it as the brightness was increased.
The brightness control was modified to include a switch which
operated at approximately mid .ange disconnecting the extra
stabilizing load toward the bright end of the range.
The same new dimming circuit will be used on the
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B. PROBLEM AREAS
1) High Intensity Light Sources
The high intensity light sources
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are obtained by optically piping light from an incandenscent bulb
(with condensing lenses) through a fiber optic cable and projecting
a cone of light up through the film with a mirror and fresnel
lens assembly. The mirror and fresnel lens is supported on a
permanent magnet assembly which is coupled through magnetic attraction
to a master magnet supported under the microscope rohomboid. There
are of course two masters and two slave assemblies corresponding
to the two rhomboids.
There are a number of small problems associated
with this arrangement. Optical geometry and the size of magnets
required to get reasonable performance results in a slave assembly
which causes interference with the center shade. It appears now
that it will not be possible to use the center shade on the 25X1
unit, however this possibility was discussed with the contractors
eesentative when greed to add the 25X1
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h
p
ca
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center shades
During the customers technical representatives
recent visit, comments were made about the color of the high inten-
sity light and about the appearance of the rings on the fresnel
lens when viewing through the microscope. The customers technical
representative asked that these problems be corrected. We plan
to install a blue filter to eliminate the red-yellow hue now
present (due to use of an ' acandescent lamp and blue attenuation
in the fiber optic cable). In regard to the visibility of the
fresnel lens structure, a diffusor will be mounted over the lens
between the source and the film. This will cause an attenuation
of light. It is hoped that this loss will not be sufficient to
effect viewing under high magnifications.
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2) Wiring and Trouble Shooting Complexities
Due to the compactness of the instrument and the
necessity of having all the electronics installed within'the main
casting, the assembly and trouble shooting is requiring more time
than originally estimated. Photograph #865 enclosed shows the
inside of the instrument. it is included only to show the
complex packaging of electrical and mechanical components and to
give the reader a better feel for the assembly and trouble shooting
time required.
3) Overrun on Target Coat
It appears now that thel linstruments can GJ"
not be completed within the original target cost of the contract.
This is due to a multitide of unforseen problems which have con-
sumed large amounts of the estimated engineering and shop time.
These unforseen problems did not occur until the check out and
debugging stages. A letter requesting overrun funding has been
submitted to the contracting officer.
C. PROJECTED WORK FOR 57ANUARY
Wit will be shipped.
Unit will be completed and made ready for inspection
by the customers technical representative. This will include the
addition of diffusors and color correction filters on the high
intensity light sources. ?
D. SUMMARY OF CORRESPONDENCE
1) Visit
entative
by customers technical repres-
isitedi Ito inspect 25X1
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Unit was not fully operatioha'l, however the high intensity
of the freenel lens when viewing through the microscope be reduced
light source was demonstrated requested that the visibility 25X1
and the color of the light be changed more toward blue
indicated this would be done.
2) Letter Ito contracting officer 12-29-66
requesting additional funds to continue work
E. FINANCIAL REPORT
Financial Report for month of December is enclosed.
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