FLIR CM275 USER MANUAL Document Identifier: CM275-en-US_AC
11. Appendices
11.1 Emissivity Factors for Common Materials
11.2 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 disturbances
1
.
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 ±2
o
C 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
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