ASD Document 600540 Rev. J
70
FieldSpec® 3 User Manual
www.asdi.com
Chapter 7 Field Measurements
Reflectance = Energy reflected from target/energy incident on target
7.11.2
Maintaining Spectralon References
Spectralon is an optical standard and should be handled in much the same way
as other optical standards. Although the material is very durable, care should
be taken to prevent contaminants such as finger oils from contacting the
material’s surface. Always wear clean gloves when handling Spectralon.
To clean a lightly soiled Spectralon white reference
If the material is lightly soiled, it may be air brushed with a jet of clean dry air
or nitrogen.
WARNING!
DO NOT use Freon.
To clean a heavily soiled Spectralon white reference
Sand the Spectralon material under running water with a 220-240 grit
waterproof emery cloth or sandpaper until the surface is totally hydrophobic
(water beads and runs off immediately).
Step 1
Use a flat surface, such as a thick, flat piece of glass.
1200
0.992
1300
0.992
1400
0.991
1500
0.991
1600
0.991
1700
0.988
1800
0.989
1900
0.981
2000
0.976
2100
0.953
2200
0.973
2300
0.972
2400
0.955
2500
0.950
Table 7-2Labsphere's published reflectance data for uncalibrated Spectralon (+/- 0.5%)
Wavelength (nm)
SRM-990 “Uncalibrated”
Spectralon Reflectance
Summary of Contents for FieldSpec 3
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