Section 6 — APPLICATIONS GUIDE
6–8
TABLE 6.3
GUIDE TO EMISSIVITY VALUES FOR TARGET MATERIALS IN IDEALIZED FORM
ARRANGED BY CLASSES OF MATERIALS
INSTRUMENT SERIES:
MODLINE 4, Series 45
SPECTRUM: 3.7 to 4.0 microns
All specimens in this table are in the following form:
1. Thick enough to reduce Transmittance
τ
to less than 0.01.
2. Viewed surface clean, flat, and optically smooth.
TARGET MATERIAL
MINIMUM THICKNESS
REFLECTANCE
EMISSIVITY
(inches)
r
ε
GLASSES
SODA-LIME (WINDOWS, BOTTLES)
0.40
0.02
0.98
CHEMICAL “PYREX”
0.10
.02
.98
FUSED QUARTZ
1.4
.02
.98
METALS, BARE Unoxidized (For oxidized samples of metals, refer to Table 6.4.)
ALUMINUM
Materials in this class are
0.97
0.03
CHROMIUM
opaque (zero transmittance)
.75
.25
COPPER
at any thickness
.98
.02
GOLD
.98
.02
IRON, CARBON STEEL
.88
.12
NICKEL
.92
.08
SILVER
.97
.03
STAINLESS STEEL
.83
.17
TIN
.73
.27
ZINC
.93
.07
(GRAPHITE)
.48
.52
Summary of Contents for Modline 4
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