ASD Document 600541 Rev. G 39 TerraSpec® User Manual
www.asdi.com Chapter 6 Field Measurements
Spectralon is made of polytetraflouroethylene (PTFE) and cintered halon. It
has the characteristic of being nearly 100% reflective within the wavelength
range of 350 nm to 2500 nm. A Spectralon white reference scatters light
uniformly in all directions within that wavelength range.
6.4.1 Spectralon Reflectance Data
Table 6-1 shows the published reflectance data for an uncalibrated SRM-990.
When SRM-990 is used as the white reference for a reflectance measurement
with the TerraSpec spectrometer, an even closer reflectance value for the
sample can be calculated.
Table 6-1Labsphere's published reflectance data for uncalibrated Spectralon (+/- 0.5%)
Wavelength (nm)
SRM-990 “Uncalibrated”
Spectralon Reflectance
250 0.950
300 0.985
400 0.990
500 0.991
600 0.992
700 0.992
800 0.991
900 0.991
1000 0.993
1100 0.993
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
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