2
*When range of values for temperature and emissivity are given, end points correspond and linear interpolation of emissivity is acceptable.
Introduction:
Emissivity is a modifying factor ud in single color thermometry to achieve a correct temperature reading. Emissivity, or radiating efficiency, of most materials is function of surface condition, temperature and wavelength of measurement.
In the following table, values for the total emissivity of various surfaces, as well as spectral emissivity at a given temperature, have been tabulated. Total emissivity is defined as the resultant value when the individual emissivity factors are averaged over the total radiation spectrum being utilized.
The ur may find that for the application a different emissivity tting is required than the one tabulated. This table, however, will provide the best initial tting. A more refined value should be determined experimentally.
References:
1) Handbook of Chemistry and Physics, Chemical Rubber Publishing Co., Cleveland, Ohio 2) DMIC Report 177, Battelle Memorial Institute
3) Thermal Radiation Properties Survey, Honeywell Rearch Center
LumaSen Technologies, Inc. 3301 Leonard Ct.
Santa Clara, CA 95054, USA
3
*When range of values for temperature and emissivity are given, end points correspond and linear interpolation of emissivity is acceptable.
Environmental Specifications
Material Temperature °C *Emissivity
Alloys
20Ni-25Cr-55Fe, oxidized 200 0.90
500 0.97 60Ni-12Cr-28Fe, oxidized 270 0.89
560 0.82 80Ni-20Cr, oxidized 100 0.87 600 0.87
1300
0.89 Aluminum
Polished 100 0.095 Highly Polished 50-500 0.04-0.06 Unoxidized 25 0.022 100 0.028
500 0.060 Oxidized 200 0.11
600 0.19 Commercial Sheet
100 0.090 Anodized Sheet, Chromic Acid Proc 100 0.55 Heavily Oxidized 93-504 0.2-0.31
Aluminum Oxide
500-827 0.42-0.26 Asbestos
Board 20 0.96 Cement 0-200 0.96 Cloth 93 0.90
Paper
0-100 0.95 Asphalt Ambient 0.90-0.98
4
*When range of values for temperature and emissivity are given, end points correspond and linear interpolation of emissivity is acceptable.
A Oil, on polished metal
.001” Thick Ambient 0.27 .002” Thick Ambient 0.46
005” Thick
Ambient 0.72 Bismuth, Unoxidized
Bismuth, Unoxidized
25 0.048
100
0.061 Brass
Polished 200 0.03 Unoxidized 25 0.035
100 0.035 Oxidized 200 0.61
600 0.59
Rolled Sheet
20what is your name
0.06 Brick
Building
1000 0.450 Red, rough, no gross irregularities 20 0.930 Grog, brick, glazed 1100 0.750 Silica brick 1000 0.80
1100 0.85
Fire Brick
办会计证1000 0.750 Bronze, Polished 50
0.10 Carbon
汉语译英语Filament 1000-1400
0.53 Graphite
0-3600 0.70-0.80 Lamp, black, water glass coating 20-400 0.96 Soot applied to solid 50-1000 0.96 Candle soot
97-270 0.952 Graphite, presd, filed surface 250-510
0.980
Unoxidized
25
0.81
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*When range of values for temperature and emissivity are given, end points correspond and linear interpolation of emissivity is acceptable.
500
0.81 Carborundum 87SIC; 2.3 density 1010-1400
0.920-0.820 Ceramic Earthenware 20 0.90 Porcelain, Glazed 20 0.92 Refractory Black 93 0.94
渲染的意思
Refractory White
93 0.90 Chromium
Polished 50
0.10
500-1000
水立方介绍0.28-0.38 Unoxidized 100 0.08 Oxidized 316 0.08 482 0.18
650 0.27 816 0.36
982
恩泽的意思0.66 Cobalt, Unoxidized Cobalt, Unoxidized
500 0.13
1000
0.23 Columbium Polished 1500 0.19
2000 0.24 Oxidized 816 0.73
927 0.70 Concrete 0-100 0.94 Concrete Tiles 1000
0.630 Copper
Commercial, Scoured to a shineburl
门基乐队20
0.07
