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-RDP78B05171A000400030097-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: July 7, 2006
• Sequence Number: 97
• Publication Date: May 8, 1970
• Content Type: MF

Approved For Release 2006/07/07: CIA-RDP78BO5171AO00400030097-4
TSSG/ESD/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
Microstereoscope
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 in ion led to discussions with
of the Photometry Section, Optical Physics
Division, National Bureau of Standards. This division has been making
color measurements in the past. To establish a better "feel" 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 tw ight Tables and through a microscope
system.- This data could also provide 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) ight Table Model MIM-47B100,
2) i ht Table Model MIM-455100
3) L 1 Model Zoom 2
wi a omboid 2X attachment.
3. Although the spectroradiometric measurements were made and the
equipment returned to NPIC 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.
CONFIDENTIA
~nnFrn7m7 A. fnP7sRQ517lA000400030097-4
25X1
25X1
 Approved For Release 2006/07/07 7CIA-RDP78B05171AO00400030097-4
Po,:,ition of Sensor During Measurement
Left ' Luminaire
Right
Light Table Serial No. 00037
Correlated Color Temp. - Kelvins
Position of Sensor
1 2 3 4 5 6
At maximum intensity
560
0
5600
5450
5650
5650
5650
At 10% of maximum
550
0
5450
5400
5500
5550
5550
Chromaticity Coordinates
At maximum intensity x - .33
0
.331
.334
.330
.329
.329
y
.35
8
.359
.362
.357
.357
.357
At 10% of maximum
x
- .33
3
.334
.336
.333
.331
.332
y
- .36
1
.362
.364
.362
.361
.360
Color Rendering Index
At maximum intensity
73.
11
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
C01'IFIDENTIA
 Approved For Release 20061 f r-)CIA-RDP78BO5171 A000400030097-4
Light Table Serial No. 00195
Correlated Color Temp. - Kelvins
Position of Sensor
1 2 3 4 5 6.
At maximum intensity
5750
5700
5750
5650
5550
5550
At 10% of maximum
5600
5450
5450
5650
5600
5400
Chromaticity Coordinates
At maximum intensity
x.-
.326
.328
.326
.329
.331
.331
y -
.364
.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
Correlated Color Temp. - Kelvins
At maximum intensity
- maximum magnification
- minimum magnification
Chromaticity Coordinates
At maximum intensity
- maximum magnification x
1 y
- minimum magnification x
I y
Color Rendering Index I
At maximum intensity
- maximum magnification
- minimum magnification
Rhomboids Over Position 2
Left Eyepiece Right Eyepiece
4800 4800
4800 4800
.363 .360
.443 .443
.364 .362
.443 .443
56.9 57.0
57.0 56.8
CONFIDEKIRDP78B05171 e 2nnAm7m7 A0 00400030097-4
 Approved For Release.2006/07/``0lpg~7 : CIA-RDP78B05171AO00400030097-4
4. On 21 April, TEB made color measurements on the luminaires in light
table serial no. 00037. The data yields a relative comparison of the
accuracy of TEB's measuring process at that time to data supplied by
N.B.S. During the 4 month intervening period between these measurements,
`it is believed that the light sources received only short periods of use.
TEB'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)
Correlated Color Temp. - Kelvins
Sensor
Position
2
Deviation Sensor Deviation
from Position from
NBS Data 5 NBS Data
At maximum intensity
5550
0.9%
5600
At 10 fo of maximum
5200
- 4.6%
5150
1
- 7.
2%
Chromaticity Coordinates
At maximum intensity
x -
.331
o . o~
.331
+ 0.
6%0
y -
.357
- 0.6%
.357
0.
0%
At 10% of maximum
x -
.341
+ 2.1%
.343
+ 3.
6%
y -
.363
+ 0.3%
.366
1.
4%
Color Tendering Index
At, maximum intensity
69.1
- 6.4%
69.1
- 6.
2%
At l0% of maximum
70.3
- 6.8%
70.9
- 5.6
%
est Engineer
TEB/ESD
2ClflEiiIfl
~?NF!D N~'t*r* l .RDP78BO
 Approved For Release 2006/07107: CIA-RDP78B05171A000400030097-4
Distribution:
Orig. & 2 - NPIC~`1'SSG~ESD~TEB
1 - Addressee
1 - NPIC~TSSG~PPS
' 1 - NPIC~TSSG~RED
` 1 - NPIC~TSSG~IZLD
l - NPTC~TSSG~RED
1 - NPTC~TSSG~RED
1 - NPiC~TSSG~RED
NPIC~TSSG~ESD
(through Ch~TSSG~
CONFIDE~T1~~,
8 May 1970
 Approved For Release 2006/07107 :CIA-RDP78B05171A000400030
CENTER~UTING SLIP
TSSG~TEB~ESD I 11 May 70
CH/TSSG ESD
Chief RED