GENTLEMEN;

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002900040064-7
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 5
• Document Creation Date: December 28, 2016
• Document Release Date: November 25, 2002
• Sequence Number: 64
• Publication Date: March 1, 1966
• Content Type: LETTER

STAT
Approved Fo` lease 2003/01/28 : CIA-RDP78B0474 002900040064-7
Progress Report - January 1966
Projects 552 and 552A
Gentlemen;
Progress Report on Projects 552 and 552A for the period
January 1966.
Enclosed are three (3) copies of
Very truly yours,
STAT
STAT
STAT
LHB/de
Enc: (3) P.R.
Declass Review by
NIMA/DOD
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 STAT
Approved For,,,Release 2003/01/28 : CIA-RDP78B047 002900040064-7
PROGRESS REPORT
For
VERSATILE, HIGH PRECISION STEREO
POINT TRANSFER DEVICE
Period Covered: January 1966
Dated: 23 February 1966
Job No.: #552, #552A
Document No.: OD-281
Approved For Release 2003/01/28 : CIA-RDP78B04747A002900040064-7
 STAT
PROGRESS REPORT
For
VERSATILE, HIGH PRECISION STEREO
POINT TRANSFER DEVICE
Progress Report 552 &-552A for January 1966
January's effort concerned itself with completing laser
optics redesign and alignment schemes on the Point Transfer Device.
OBJECTIVE ASSEMBLIES
Physical reworking of both objective assemblies was
completed to incorporate the longer focal length relay lens and
new reticle wheel location.
Beam splitters were sent out to be reworked to get
50%-50% neutral coating to replace dichroic film. A delay was
seen in placing rework because many coaters offered a poor fre-
quency response, or a fair amount absorbtion. As a conclusion,
transmission will vary about 14% in.the region of 4000 A to 7000 A,
reflection being greater at the 7000 A end, favoring the lasers'
output slightly. Beam splitters should be returned and assembled
early next reporting period.
In the process of debugging the laser reticle wheel
drives, a number of failures were seen in the "Ledex" indexing
mechanism caused by the reticle wheels' momentum. Reducing wheels'
inertia by 2/3 was not an adequate solution for long life. After
discussing this problem with Ledex a slightly different device
was recommended and is now being installed. With magnetic means
in place of mechanical braking of the load a longer service life
-1-
Approved For Release 2003/01/28 : CIA-RDP78BO4747AO02900040064-7
 is expected. To win this advantage the control and power supply
regulating circuits had to be redesigned and should be completed
during the next reporting period.
The problem of accurate laser alignment has been studied
and will require further development when objective assemblies are
finally aligned on the system. The most promising technique seen
is to have light from an accurately centered small aperture under
the objective lens projected back through the laser optics and
observing the star pattern that would be seen at the laser crystal.
Adjustments are then made to get a symmetrical image optimized for
brightness. The important point here is that all elements except
laser crystal, have to be in their normal position. Since the
viewing device is mechanically located as the laser crystal would
be, fair assurance of final crystal alignment is-made. Because
laser head is hard mounted to the objective assembly main plate,
head service should not disturb alignment too seriously. However,
normal cleaning of crystals and lamps do not require head removal,
but do have to be carefully executed. Crystal coatings are very
easily damaged and exception cleanliness of crystal and lamp bodies
is required.
Visual optics are in the process of-being aligned and
is the prerequisite of the laser optics alignment. Several tools
have been designed and built to promote accurate adjustments Of
the laser and visual image correspondence that is essential for
good laser marking at the film plane.
Completion of optical adjustments and debugging is ex-
pected at the end of next reporting period. Simultaneous work is
being completed on the scanning drive alignments.
STAT
Approved For Release 2003/01/28 : CIA-RDP78BO4747AO02900040064-7
-2-
 STAT
ENCODER COUNTER U SYSTEM
All hardware has been made and assembled and all components
required in plant. Wiring and debugging will start early next re-
porting period. Noise tests concluded that shielded cable selected
appeared quite suitable for-the long cables required in the system,
permitting the DRC 15 EL44 modules to be placed at the switch
assembly not at the encoders.
Work for Next Re-porting Period
1) Complete optical, scanning and system adjustments and debugging
552 #101.
2) Complete wiring, debugging encoder-counter subsystem.
Approved For Release 2003/01/28 : CIA-RDP78B04747A002900040064-7