INVOICE #3

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900010022-7
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: June 8, 2005
• Sequence Number: 22
• Publication Date: September 30, 1965
• Content Type: CONT

STAT Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010022-7
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Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010022-7
 Approved For.Release 2005/06/23 : CIA-RDP78BO477OA002900010022-7
September 30, 1965
- y letter progress rap rt > Contract
rrect n$ COPY d amp report w Confirm and recalculate
ordinate for OO' black body radiation. Complete Table 1.
Principal ssociote, 1 day, Task 11)
rt for mailing. (Principal
Lion and rcl
ashington, D.C. office of Contracting Officer.
rincipal Associste, -t day, Task 1)
Tuesday. Sew. 7 thru Friday,, Se t. 10,,. 1965
.sue at n to" ash- n on, T.:, office "a inica1 Representative
Contracting Of 'icer for orl..ent'ation a?d briefing. (Princi-
pal Associate, 4 days p Task 1.)
Hands Sept. t13, 1965
'Lary search for date on carbon arc lamp visual efficien
anci brightness. (Principal Associate, day, Task it)
Sept. 144 1965
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September 30, 1965
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(Principal Associate, I d - . Task II)
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010022-7
September 30, 1965
Monthly letter progress report - Contract
-Comments on Status
Task I - Item 1 "Special Investigations"
A visitation was made to the Washington, D.C. office of the
,Technical Representative of the Contracting Officer for
orientation and briefing.
Task II - Item 1 "Submicron Measurement Error Analysis"
See attached technical note.
Task II - Item 5 "Lamps for Rear Projection Viewers"
A technical report. was submitted on September 1, 1965, which
presented the findings to date. Of the lamps surveyed, the
Mercury-xenon compact arc seemed to have the highest luminous
efficiency. Whether or not the color of the mercury xenon
lamp is acceptable is questionable. At the request of
John R a simple experiment was defined which could be
set up by the laboratory branch for evaluating color accept-
ability of the mercury-xenon lamp as compared to tungsten,
xenon and mercury lamps.
Tungsten lamps have a high conversion efficiency of input
watts to radiated watts but a low luminous efficiency because
their color temperature is relatively low. Compact arc lamps
do not have as high a conversion efficiency of input watts
to radiated watts but have higher luminous efficiency because
their color temperature is high.
What is desired is both a high conversion efficiency and a
high color temperature. I believe that the high intensity
carbon arc may have the above desirable combination. A
search is being made for photometric data on carbon arcs.
It has been found in the literature that hi h intensity arcs
can be operated at.high color temperatures (55000K to 65000K)
but:-:data have not as yet been found on the conversion
efficiency.
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010022-7
September 30, 1965
TAT
Task II - Item 1 Submicron Measurement Error Analysis
Comments on some Vibration Measurements
WORK STATEMENT
Evaluate the physical and metallurgical properties
of materials used in measuring engine construction
to determine comparative suitability to submicron
measuring. Materials to be considered are:
Meehanite, steel, granite, aluminum, magnesium, and
glass, and other materials that may be particularly
suitable.
Evaluate physical properties and structural concepts
appropriate to achievement of vibration levels and
structural rigidity compatible with submicron
measuring requirements. Evaluate methods of measur-
ing the small vibration levels expected in a high
performance structure.
Reports No. 1 and No. 2 dealt with the physical and metal-
lurgical properties of materials. Report No. 3 dealt with
structural rigidity and vibration control of the machine
structure. Report No. 4 presented results of a computer
analysis of building floor vibration frequency. This
technical note contains comments on building floor vibration
measurements.
Submitted by:
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 Approved For Release 2005/06/23 : CIA-RDP78BO477OA002900010022-7
Technical Note on Building Floor Vibration Measurements
In technical report no. 4, dated July 30,
1965,
the
results were presented of a computer analysis
of the
free-
vibration mode of a typical bay in the building in which the
submicron measuring instrument will be used. The computer
analysis indicated that the fundamental mode of the floor
slab vibration was 15.6 cps. This is considerably lower than
the 20 cps to 65 cps previously estimated from manual calcula-
tions. The lower floor slab frequency makes it much more
difficult to achieve effective vibration isolation between the
floor slab and the measuring instrument. Whereas we had
previously believed that an 8 cps mount would be satisfactory
(for floor frequencies of 30 cps and higher), it now appears
,that a 2 cps mount is necessary for 15 cps input from the
floor. Fig. 1 illustrates the greater effectiveness of a
2 cps mount.
An attempt was made to detect floor slab resonant
frequencies but results were questionable. During the day
we were not able to excite the floor slab above the back-
ground level. A test was made in the early morning when the
background level was low and 30 cps, 60 cps and 90 cps was
detected. The results are suspect because we could not be
assured that we were not measuring stray voltages from the
60 cps building power.
A report on Bureau of Standards floor vibration measure-
ments made in 1960 was reviewed. The report indicated that
on the second floor, the vertical component could go as low
,as 5 to 7 cps and horizontal components as low as 3 to 5 cps.
Effective isolation of frequencies that low is hopeless.
In fact we hesitate to recommend a mount as soft as 2 cps.
A mount suspended on vibration isolators that soft is awkward
for an operator to work on because small forces create large
excursions. For an 8 cps mount the lg excursion is only 0.165
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inches but for a 2 cps mount the lg excursion is 22 inches.
Present thinking is that it may be better to use 8 cps
pneumatic vibration isolators and design the instrument
structure so that it will move as a single mass at 25 cps and
below. Pneumatic is emphasized in the above statement
because it is one of the few types of support which do not
provide a high frequency path (90 cps to 500 cps and up).
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