FLIR CM174 - Page 29

FLIR CM174 USER MANUAL Document Identifier: CM174-en-US_AC
29
5.10.4 Emissivity Factors for Common Materials
5.10.5 Non-Uniformity Correction
A non-uniformity correction (or NUC) is an image correction carried out by the camera
software to compensate for different sensitivities of detector elements and other optical
and geometrical disturbances1.
The NUC is an automatic function that takes place periodically (approximately every 2-3
minutes) or whenever the inner core of the cameral detects a ±2oC temperature change.
1. Definition from the imminent international adoption of DIN 54190-3 (Non-destructive testing –
Thermographic testing – Part 3: Terms and definitions).
Material
Emissivity
Material
Emissivity
Asphalt
0.90 to 0.98
Cloth (black)
0.98
Concrete
0.94
Skin (human)
0.98
Cement
0.96
Leather
0.75 to 0.80
Sand
0.90
Charcoal (powder)
0.96
Soil
0.92 to 0.96
Lacquer
0.80 to 0.95
Water
0.92 to 0.96
Lacquer (matt)
0.97
Ice
0.96 to 0.98
Rubber (black)
0.94
Snow
0.83
Plastic
0.85 to 0.95
Glass
0.90 to 0.95
Timber
0.90
Ceramic
0.90 to 0.94
Paper
0.70 to 0.94
Marble
0.94
Chromium Oxides
0.81
Plaster
0.80 to 0.90
Copper Oxides
0.78
Mortar
0.89 to 0.91
Iron Oxides
0.78 to 0.82
Brick
0.93 to 0.96
Textiles
0.90