RayTek MP150 User Manual

Appendix
60 Rev. E3 07/2013 MP150
N
ON
-M
ETALS
Material
Emissivity
1 µm
1.6 µm
5 µm
Asbestos
0.9
0.8
0.9
Asphalt
0.95
Basalt
0.7
Carbon
0.9
Unoxidized
0.8-0.9
Graphite
0.7-0.9
Carborundum
0.9
Ceramic
0.4
0.8-0.95
Clay
0.85-0.95
Concrete
0.65
0.2
0.9
Cloth
0.4-0.9
0.95
Glass
Plate
0.98
“Gob”
0.9
Gravel
0.95
0.95
Gypsum
0.8-0.95
0.4-0.97
Ice
—
Limestone
0.4-0.98
Paint (non-al.)
0.8-0.9
—
Paper (any color)
0.8-0.9
0.95
Plastic (opaque, over 20 mils)
0.95
Rubber
0.9
Sand
0.9
Snow
—
Soil
—
Water
0.8-0.95
—
Wood, Natural
0.9-0.95
Tab. 8: Typical Emissivity Values
To optimize surface temperature measurements, consider the following guidelines:
• Determine the object emissivity using the instrument which is also to be used for the
measurements.
• Avoid reflections by shielding the object from surrounding temperature sources.
• For higher temperature objects use instruments with the shortest wavelength possible.
• For translucent materials such as plastic foils or glass, assure that the background is uniform
and lower in temperature than the object.
• Mount the sensor perpendicular to surface whenever emissivity is less than 0.9. In all cases, do
not exceed angles more than 30 degrees from incidence.

RayTek MP150 Specifications

General

Brand	RayTek
Model	MP150
Category	Scanner
Language	English