MEMORANDUM TEST REPORT ON N.B.S. MEASURED COLOR PROPERTIES OF LIGHT TABLES AND THROUGH A MICROSTEREOSCOPE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000300010018-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: July 30, 2003
• Sequence Number: 18
• Publication Date: May 8, 1970
• Content Type: MF

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Approved For Release 200 ~?~ Y?91:~~yy~~~~gg >1IlA`I 8B05171A000300010018-7
TSSG/FED/TEB-08-70
8 May 1970
MEMORANDUM FOR: Chief, Research & Engineering Division, TSSG
THROUGH Chief, TEB/ESD
Chief, ESD/TSSG
SUBJECT . Memorandum Test Report on N.B.S. Measured Color.
Properties of Light Tables and Through a
Microster.eoscope
1. In late October. 1969, ESD/TEB started an investigation to
determine what equipments and methods were available for testing and
evaluating the color quality and color rendering properties of
fluorescent luminaries as used with viewing light tables. This
investigation resulted in procurement of equipment and determining test
procedures, both of which are now in use by TEB. The measuring system
adopted was the CIE method, a widely used psychophysical system.
2. The above investigation led to discussions with
I of the Photometry Section, Optical Physics
Division, National. ureau of Standards. This division has been making
color measurements in the past. To establish a better "fee]." for color
measurement and to provide base line data which we could compare our
measuring techniques to, TEB asked N.B.S. to make selected color measure-
ments of luminaires in two Light Tables and through a microscope
system. This data could also provz e the center with a start point for
specifying color by describing the color characteristics of existing
equipments. On November 26, the following equipments along with a list
of required measurements were delivered to N.B.S.
1} Tight Table Model M_IM-47B100,
2) Light Table, Model MTM-1+55100
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3) Model Zoom 21
with a Rhomboid 2X attachment.
3. Although the spe6troradiometric measurements were made and the
equipment returned to NPI6 in December, the data requested has been
long in coming. An official report will be provided by N.B.S. at a later
time. The measurement data which will be in the formal report has been
obtained and is given in detail below.
Declass Review by
NIMA/E OD
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Cxciaded from autema:i,
CONFIDENTIAL d~agratliiclassiiiC ation
on
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Position of Sensor During Measurement
Lii
Left I Luminaire
Right Lum:inaire
Light Table Serial No. 00037
Test Parameter
Position of Sensor
1 2 3 1~ 5 6
Correlated Color Temp. - Kelvins
At maximum intensity 5600 5600 5+50 5650 5650 5650
At 10% of maximum 5500 51150 51100 5500 5550 5550
Chromaticity Coordinates
At maximum intensity x
y
i
Ate lClo of maximum x -
.330 .331 .334 .330 .329 .329
.358 .359 .362 .357 .357 .357
.333 .3311 .336 .333 .331 .332
.361 .362 .364 .362 .361 .360
Color Rendering Index
At maximum intensity 73.1+ 73.8 73.3 73.6 73.7 73.2
At 10% of maximum. 75.3 75.4 75.1 75.3 75.1 75.1
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 Approved For Release 2003/ f?B05171A000300010018-7
Light Table Serial No. 00.195
Position of Sensor
2 3 4 5 6
Correlated Color Temp. - Kelvins
At maximum intensity
5750
5700
5750
5650
5550
5550
At l0a/o of maximum
5600
5450
5450
5650
5600
5)Fo0
Chromaticity Coordinates
At maximum intensity
x.-
.326
.328
.326
.329
.331
.331
y -
.36)1
.366
.365
.364
.367
.366
At 10% of maximum
x -
.330
.334
.334
.330
.330
.336
y -
.364
.367
.369
.364
.365
.370
Color Rendering Index
At maximum intensity
75.7
76.3
75.5
75.7
75.5
75.9
At 10% of maximum
77.7
77.5
77.1
77.4
77.4
78.0
Table 00195 Light Source When Viewed Thru Microscope
and Rhomboid Optics
Rhomboids Over Position 2
Left Eyepiece
Right Eyepiece
Correlated Color Temp. - Kelvins
At maximum intensity
- maximum magnification
4800
48oo
- minimum magnification
48oo
48oo
Chromaticity Coordinates
At maximum intensity
- maximum magnification
x -
.363
.360
y
.443
.443
- minimum magnification
x -
.364
.362
y
.443
.1413
Color Rendering Index
At maximum intensity
- maximum magnification
56.9
57.0
- minimum magnification
57.0
56.8
-3-
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CONFIDENTIAL
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LI . On 2.iE Ap.r. il, TEB made color measurements on the luminaires in light
table serial no. 00031. The data yields a relative comparison of the
accuracy of `HOD 's measuring process at that time to data supplied by
N.B.S. During the )I month intervening period between these measurements,
it is believed that the light sources received on:l,y, short periods of use.
TSB's measurements are listed below with percentage deviation from N.B.S.
data. This assumes that the color quality of the luminaires did not
change due to intervening use.
Light Table Serial No. 00037
(TEB Measurements)
Sensor
Test Parameter Position
2
Deviation
from
NBS Data
Sensor
Position
5
Deviation
from
NBS Data
Correlated Color Temp. - Kelvins
At maximum intensity 5550
- 0.9%
5600
- 0.9%
At 1.0% of maximum 5200
- 4.6%
5150
- 7.2%
Chromaticity Coordinates
At maximum intensity x - .331
0.07
.331
+ 0.6%
y - .357
- 0.6%
.357
0.0%
At l0?o of maximum x - .341
+ 2.1%
-343
+ 3.6%
y - .363
+ 0.3%
.366
- 1. 16
Color Rendering Index
At maximum intensity 69.1
- 6.1%o
69.1
- 6.2%
At 10o of maximum 70.3
- 6.8%
70.9
- 5.6%
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es ngineer
TEB/ESD
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CONFIDENTIAL
 Approved For Release 2003/08/05,t*#" fAf 171A000300010018-7
Distribution:
Orig. & 2 - NPIC/TSSG/FSD/ThB
1 - Addressee
1. - NPIC/T'SSG/PPS (through Ch/TSSG)
1 - NPIC/'TSSG/RED
1 - NPIC/TSSG/RED
I - NPIC/TSSG/RED
1 - NPIC/TSSG/RFD/
1 - NPIC/'.i.'SSG/RIND/
NPIC/TSSG/ESD/TTEB
(8 May 1970
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TSSG TEB ESD 11 May 70
TO I
NITIALS
DATE
REMARKS
DIRECTOR
DEP/DIRECTOR
EXEC/DIRECTOR
SPECIAL ASST
ASST TO DIR
ASST TO DEP/DIR
CH/PPBS
DEP CH/PPBS
ED/ S
ti
CH/IEG
DEP CH/IEG
EO/IEG
CH/PSG
DEP CH/PSG
EO/PSG
CH/DBD/PSG
CH/- " G
DEP CH/TSSG
EO/TSSG
Ch/RED
DIR/IAS/DDI
CH/DIA/XX4
CH/DIA/AP-1 P
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A
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5 : CIA-RDP78B05171A000300010018-
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