Maintaining Spectralon References - ASD FieldSpec 3 User Manual

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Table 7-2
7.11.2

Maintaining Spectralon References

To clean a lightly soiled Spectralon white reference
WARNING!
To clean a heavily soiled Spectralon white reference
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
ASD.Document 600540 Rev. C
Labsphere's published reflectance data for uncalibrated Spectralon® (+/- 0.5%)
2300
2400
2500
Reflectance = Energy reflected from target/energy incident on target
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.
If the material is lightly soiled, it may be air brushed with a jet of clean dry air
or nitrogen.
DO NOT use Freon.
Sand the Spectralon material under running water1 with a 220-240 grit
waterproof emery cloth until the surface is totally hydrophobic (water beads
and runs off immediately).
Use a flat surface, such as a thick, flat piece of glass.
Place the glass into the sink.
Place 220 grade wet sandpaper onto the glass.
Gently move the Spectralon reference in a figure 8 motion on the sandpaper,
using water as needed to wash away the thin layer that is sanded off.
Blow dry with clean air or nitrogen or allow the material to air dry.
If the material requires high resistance to deep UV radiation, the piece should
be prepared as above, then either of the following two treatments performed.
1 Flush the Spectralon piece with >18 m½ distilled, deionized water for 24
hours.
67
Chapter 7 Field Measurements
Wavelength (nm)
0.972
0.955
0.950
FieldSpec® 3 User Manual
SRM-990 "Uncalibrated"
Spectralon® Reflectance