LIMIT 96 Manual Del Usuario página 9

13. Visual field
Ensure that the target is larger than the diameter of the two laser spots. The smaller the target is, the closer
should the measurement distance be. Suggested measurement distance should be so the diameter of the two
laser spots cover less than 75% of the testing area (shown below).
14. Emissivity
Emissivity characterization reflects the of material's radiated energy. Emissivity for most organic materials,
paints or oxidized surfaces are about 0.95. Total emissivity of selected metals and non-metals are listed in the
following table.
Measured surfaces
Metal
Aluminum Oxidization
Oxidization
A3003 Alloy
Rough
Burnishing
Brass
Oxidization
Oxidization
Copper
Electric terminal board
Hastelloy Alloy
Oxidization
Inconel Sand-blasting
Electro burnishing
Oxidization
Iron
Rusting
Oxidization
Iron (casting) Non-oxidization
Casting
Iron (forging) Passivation
Rough
Lead
Oxidization
Molybdenum Oxidization
Nickel Oxidization
Platinum Black
Cold rolling
Steel Steel plate burnishing
Steel plate rubbing
Zinc Oxidization
Emissivity
0.2-0.4 Asbestos
0.3 Asphalt
0.1-0.3 Basalt
0.3
0.5 Carbon
0.4-0.8
0.6 Ceramics
0.3-0.8 Clay
0.7-0.95 Concrete
0.3-0.6 Cloth
0.15
0.5-0.9 Glass
0.5-0.7
0.6-0.95 Plates
0.2 Stone products
0.2-0.3 Plaster
0.9 Ice
0.4 Limestone
0.2-0.6 Paper
0.2-0.6 Plastics
0.2-0.5 Water
0.9 Soil
0.7-0.9 Wood
0.4-0.6
0.1
0.1
5
Measured surfaces
Non-metal
Non-oxidization
Graphite
Silicon carbide
Convex glass
Smooth glass
Lead-boron glass
English
GB
Emissivity
0.95
0.95
0.7
0.8-0.9
0.7-0.8
0.9
0.95
0.95
0.95
0.9
0.76-0.8
0.92-0.94
0.78-0.82
0.96
0.93
0.8-0.95
0.98
0.98
0.95
0.95
0.93
0.9-0.98
0.9-0.95