MEMORANDUM TEST REPORT ON THE PREHEAT SYSTEM OF (Sanitized) MIM-47B100 LIGHT TABLE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002200040008-7
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: March 21, 2005
• Sequence Number: 8
• Publication Date: January 30, 1970
• Content Type: MF

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 MEMORANDUM-FOR: Chief, Research and Engineering Division, TSSG
TSSG/E,SD/TEB-2 70
30 January 1970
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Chief, Engineering Support Division, TSSG
SUBJECT . Memorandum Test Report on the Preheat System of a
-47B10O Light Table
250
1.1 It is the understanding of TEB that the purpose of the preheat
l
system on the
liquid-cooled light tables is to obtain maximum
luminance (photometric brightness) in the shortest practicable. time.
A question arose within TEB as to whether or not the preheat system
significantly reduces the warm-up time. As a result, a test was
devised and performed on the preheat system of a model MIM-4+7B100 Light,
serial #00063.
1.2 The table which has been tested was delivered by the manufacturer
the day before the test began. The manufacturer had been requested to
make sure the preheater was functioning properly on_this particular
table, and-he submitted a signed and dated statement to that effect.
1.3 For the "Preheat on" test, the heater was left on overnight and
during the test which began when the illumination was turned on the
following morning. ..The he.ater.wasleft off the following night and
I during the "Preheat off" test which began the morning after that. All
other conditions were essentially the same during the two days of
testing. .
2. SUMMARY OF TEST RESULTS
.2.1 Figure 1 presents comparative "preheat on" and "preheat off" ilium-.
ination vs time curves for the left stage. Figure 2 is for the right
stage.
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2.2 By averaging the minor differences between left and right stages
and reporting the luminance as a percentage of the rated 3000 foot-
lamberts, the following table effectively summarizes the results:
Elapsed
Time
Luminance in % of Rated
3000 ft-lamberts
A ?~.
(min)
Preheat off
Preheat on
5
50%
70%
20
10
65%
80%
15
15
79%
87%
8
30
94
4
40
98%
100%
2
50
100%
100%
0
2.3 Figure 3 shows that the thermostatically controlled electric-heater
is. installed in the heat exchanger located behind the lamp housing. There
is a coolant-circulating pump, but it is on only when the lamps.are on.
Therefore, preheating of the coolant within the lamphousing can occur only
through natural convection. The test results show that after the heater
was left on all night, the heater housing temperature was 100?F, the hoses
between heat exchanger and lamphouse were 76?F, and the stage glass-over
the lamphouse was 73?F, only one degree above ambient.
2.4 The detailed test data is not included. It is available in the TEB
project file.
3. CONCLUSIONS AND RECOMMENDATIONS
3.1 If the heater system in the table-which has been tested was truly
performing at its best, then the results presented herein seem to indi-
cate that-the heater is hardly worthwhile It shows what could be
considered a significant increase in. luminance only during the first
ten minutes of o-peration.
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3.2 TEB recommends the following:
a) If there is any doubt as to the performance of the heater
system which was tested, let's repeat the test on additional tables.
The manufacturer should be queried on this.
b) If the heater performance is judged to be up to design .
expectations, consult with the operating divisions regarding their
opinion as to action to be taken. TEB suggests either eliminating,
the heater on future purchases or require additional development
to further improve the luminance to elapsed time relationship. If
additional development is selected, the following alternative sug-
gestions are offered for consideration:
1) A heating element. within the fluid chamber of each
lamphouse would be a better location if convection is to be
relied upon for pre-heating.
is energized.
3) Don't try to use it as a preheater. Simply provide
a more powerful heating element and energize it through its
thermostat only when the lamp is turned on.
Distribution:
Orig. & 2 - NPIC/TSSG/ESD/TEB
1 - Addressee
1 NPIC/TSSG/RED-(Project Officer)--
1 - NPIC'/TSSG/PPS Throw h Ch/TSSG)/
1 -_NPIC/IEG OSS_
1 - DDI/IAS'
1 - DIAAP-9
1 - Army/SP
2) Make the circulating pump run whenever the pre-heatei?~.
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