PROGRESS REPORT FOR VERSATILE, HIGH PRECISION STEREO POINT TRANSFER DEVICE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002900040075-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: November 25, 2002
• Sequence Number: 75
• Publication Date: March 15, 1965
• Content Type: REPORT

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Approved F Release 2003/01/28 : CIA-RDP78B04R iA002900040075-5
PROGRESS REPORT
For
VERSATILE, HIGH PRECISION STEREO
POINT TRANSFER DEVICE
Period Covered:
February 1965
Dated:
15 March 1965
Job No.:
#552 and #552A
Document No.:
OD-239
Declass Review by
NIMA/DOD
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#552 - OD - 239
PROGRESS REPORT
For
VERSATILE, HIGH PRECISION STEREO
POINT TRANSFER DEVICE
OBJECTIVE ASSENBLY
The motions to improve vignetting and brightness have been completed
on a comparison viewer and are now under test.
Field lens additions to 1X and 7X objectives and bending of .38 lower
field lens appear to give satisfactory answers to problems seen previously. The
high intensity light source has also been modified to introduce a lens to con-
centrate light for the 7X objective lens. A brightness increase of 5 times at
?-125X magnification is now seen. Lens is automatically inserted when highest
magnification range is selected. To control film temperature with this increased
brightness, a heat reflecting filter has been added to the existing IR filtering
means.
Laser systems have been under test and checkout. Circuit improvements
to eliminate unwanted triggering of laser has been of main concern. Apparently,
because of bundling trigger circuit wires in harness spikes in adjacent circuits
have introduced signals that fire laser. Filters have been added to reject all
but the wanted firing signals. Some trouble has been experienced in the reticle
drive circuit. The film marking mode selector and reticle selection schemes have
had improvements made in their reliability. The circuit changes have been made
and now are in test before final assembly of objective assemblies.
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Approved For Release 2003/01/28 : CIA-RDP78B04747A002900040075-5
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#552 - OD - 239
VACUUM FILM HOLDDOWN
Glass platens with three (3) highly polished micro-grooves each are
being made as an attempt to get a solution for the pulldown problem. It is
hoped that groove visibility will be greatly reduced and, at the some time,
give enough exhaust path for the air bubbles under film.
To improve seal at the loop forming slot during loop forming and
tandum film viewing modes, a pneumatic clamp has been developed to holddown
film across the width. The bending of film at the slot's edge has caused poor
holddown performance by excessive leakage with new manifold design because film
is held above the platen at the ends of the manifold. The transverse clamp
has helped overcome this problem, but has introduced very small clearance with
objective lenses, loop forming rollers and their film threading facility. The
clamp is divided to right and left sections so that its action is related to
the right and left viewing areas and is driven by air pressure seen at manifolds.
Because air pressures are very low, gentle film handling is assured.
Experimental work is underway to examine interruption of vacuum to
minimize bubble formation. The thought here has been to reduce seal between
film and platen momentarily so that air under film may escape to manifold. The
combination of low vacuum cycling and diffusion technique may reduce holddown
time but no conclusion has been reached.
Approved For Release 2003/01/28 : CIA-RDP78B04747A002900040075-5
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Approved ForvjWlease 2003/01/28 : CIA-RDP78BO474W02900040075-5
SCsANNING DRIVE
Some of the modified gear boxes have been received, tested and installed
on a comparison viewer. Static torque tests have been completed, but no other
evaluation has been made. Tests are underway to evaluate precision of correspond-
ence at various magnification ratios. The new increments of 1, 7 and 50 microns
per step appear quite useful for precise image positioning.
The joystick has been thoroughly checked out mechanically and electrical
checks are underway with system tests. At the present time, correspondence is
quite good for several 1:1 magnification ratioy combinations (in uncoupled mode),
but falls off for 2:1 and high ratios. These results are of quite concern as
they contradict in part the circuit set-up established during its magnification
against stepping frequency alignment. Circuit checkout correction is now in
progress.
Because all axes stop when any carriage has reached a limit, a buzzer
has been added to tell operator why machine has stopped, and that a failure has
not occurred. Normally, buzzer should be OFF and may be actuated only during
film loading with carriages at rear extreme, or when viewing 70 mm film with a
large amount of overlap.
Work To Be Completed During Next Reporting Period
1) Install and debug scanning drive modification
2) Complete system debugging
3) Complete laser film marking evaluation
4) Complete redesign, fabrication and assembly of vacuum film holddown mechanism
5) Complete optical debugging
Approved For Release 2003/01/28 3CIA-RDP78BO4747AO02900040075-5