Infrared Spectral Emittance Measurements of Optical Materials
D. L. Stierwalt
Optical properties of solids are usually determined by measurements of either the transmittance or the reflectance. Each of these methods has advantages and disadvantages, depending upon the spectral region and the nature of the material being studied. A third method, the measurement of emittance, although little used has definite advantages under certain conditions. © 1966 Optical Society of America.
Materials
Curve 1
Temperature K: 191
Wavelength Range, μm: 19.0-50.0
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Irtran 4 (0.37 mm thick) from Eastman Kodak Co.; microcrystalline, hot pressed compact; density 5.27 g cm⁻²; data extracted from smooth curve.
Source for Curve 1
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 414, curve 4. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 1
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 19.0 | 0.127 |
| 19.7 | 0.155 |
| 20.9 | 0.173 |
| 21.6 | 0.275 |
| 22.5 | 0.667 |
| 22.9 | 0.747 |
| 23.4 | 0.69 |
| 23.6 | 0.76 |
| 24.1 | 0.805 |
| 24.3 | 0.777 |
| 24.6 | 0.678 |
| 24.7 | 0.533 |
| 25.0 | 0.483 |
| 25.2 | 0.505 |
| 25.5 | 0.546 |
| 25.8 | 0.643 |
| 26.1 | 0.659 |
| 26.5 | 0.649 |
| 26.9 | 0.657 |
| 27.7 | 0.608 |
| 28.6 | 0.494 |
| 29.6 | 0.445 |
| 30.2 | 0.445 |
| 31.2 | 0.516 |
| 32.2 | 0.637 |
| 32.4 | 0.726 |
| 32.7 | 0.824 |
| 32.9 | 0.882 |
| 33.7 | 0.901 |
| 35.0 | 0.911 |
| 36.5 | 0.939 |
| 37.8 | 0.986 |
| 38.4 | 0.978 |
| 38.7 | 0.956 |
| 39.2 | 0.825 |
| 40 | 0.44 |
| 40.6 | 0.313 |
| 41.8 | 0.241 |
| 44.3 | 0.14 |
| 45.5 | 0.12 |
| 46.9 | 0.14 |
| 47.9 | 0.221 |
| 48.7 | 0.312 |
| 49.5 | 0.342 |
| 50 | 0.353 |
Curve 2
Temperature K: 77
Wavelength Range, μm: 19.2-50.0
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Source for Curve 2
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 414, curve 5. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 2
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 19.2 | 0.116 |
| 19.6 | 0.136 |
| 20.1 | 0.147 |
| 20.8 | 0.147 |
| 21.2 | 0.174 |
| 22.1 | 0.492 |
| 22.6 | 0.666 |
| 23 | 0.591 |
| 23.3 | 0.708 |
| 23.7 | 0.774 |
| 23.8 | 0.684 |
| 24 | 0.621 |
| 24.2 | 0.509 |
| 24.3 | 0.338 |
| 24.5 | 0.328 |
| 25.0 | 0.287 |
| 25.5 | 0.452 |
| 25.9 | 0.64 |
| 26.1 | 0.551 |
| 26.4 | 0.506 |
| 27.0 | 0.529 |
| 27.9 | 0.392 |
| 28.3 | 0.376 |
| 28.7 | 0.311 |
| 29.1 | 0.286 |
| 29.5 | 0.291 |
| 29.9 | 0.279 |
| 30.7 | 0.331 |
| 31.6 | 0.397 |
| 32.1 | 0.507 |
| 32.6 | 0.79 |
| 33.0 | 0.886 |
| 33.4 | 0.917 |
| 34.0 | 0.925 |
| 35.1 | 0.914 |
| 36.4 | 0.935 |
| 37.8 | 0.985 |
| 38.4 | 0.979 |
| 38.8 | 0.74 |
| 39.4 | 0.371 |
| 40.1 | 0.238 |
| 42 | 0.139 |
| 43.7 | 0.087 |
| 44.8 | 0.074 |
| 46.1 | 0.093 |
| 47.9 | 0.221 |
| 48.7 | 0.312 |
| 49.5 | 0.342 |
| 50.0 | 0.353 |
Curve 3
Temperature K: 4.2
Wavelength Range, μm: 19.2-50.0
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Source for Curve 3
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 414, curve 6. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 3
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 19.2 | 0.116 |
| 19.6 | 0.136 |
| 20.1 | 0.147 |
| 20.8 | 0.147 |
| 21.2 | 0.174 |
| 22.1 | 0.492 |
| 22.6 | 0.666 |
| 23.0 | 0.591 |
| 23.3 | 0.708 |
| 23.7 | 0.774 |
| 23.8 | 0.684 |
| 24.0 | 0.621 |
| 24.2 | 0.509 |
| 24.3 | 0.388 |
| 24.5 | 0.328 |
| 25.2 | 0.287 |
| 25.0 | 0.452 |
| 25.5 | 0.64 |
| 25.9 | 0.551 |
| 26.1 | 0.486 |
| 26.6 | 0.504 |
| 26.9 | 0.327 |
| 28.0 | 0.266 |
| 28.8 | 0.249 |
| 29.6 | 0.23 |
| 30.1 | 0.282 |
| 30.4 | 0.316 |
| 31.6 | 0.34 |
| 32.5 | 0.747 |
| 32.9 | 0.876 |
| 33.2 | 0.909 |
| 33.8 | 0.923 |
| 35 | 0.915 |
| 36.5 | 0.933 |
| 37.8 | 0.985 |
| 38.4 | 0.979 |
| 38.8 | 0.74 |
| 39.1 | 0.337 |
| 39.5 | 0.23 |
| 40.5 | 0.163 |
| 44.2 | 0.071 |
| 44.9 | 0.058 |
| 46.0 | 0.076 |
| 47.1 | 0.155 |
| 47.9 | 0.221 |
| 48.7 | 0.312 |
| 49.5 | 0.342 |
| 50 | 0.353 |
Curve 4
Temperature K: 191
Wavelength Range, μm: 19.0-50.0
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Irtran 4 (0.37 mm thick) from Eastman Kodak Co.; microcrystalline, hot pressed compact; density 5.27 g cm⁻²; data extracted from smooth curve.
Source for Curve 4
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 414, curve 4. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 4
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 19.0 | 0.127 |
| 19.7 | 0.155 |
| 20.9 | 0.173 |
| 21.6 | 0.275 |
| 22.5 | 0.667 |
| 22.9 | 0.747 |
| 23.4 | 0.69 |
| 23.6 | 0.76 |
| 24.1 | 0.805 |
| 24.3 | 0.777 |
| 24.6 | 0.678 |
| 24.7 | 0.533 |
| 25.0 | 0.483 |
| 25.2 | 0.505 |
| 25.5 | 0.546 |
| 25.8 | 0.643 |
| 26.1 | 0.659 |
| 26.5 | 0.649 |
| 26.9 | 0.657 |
| 27.7 | 0.608 |
| 28.6 | 0.494 |
| 29.6 | 0.445 |
| 30.2 | 0.445 |
| 31.2 | 0.516 |
| 32.2 | 0.637 |
| 32.4 | 0.726 |
| 32.7 | 0.824 |
| 32.9 | 0.882 |
| 33.7 | 0.901 |
| 35.0 | 0.911 |
| 36.5 | 0.939 |
| 37.8 | 0.986 |
| 38.4 | 0.978 |
| 38.7 | 0.956 |
| 39.2 | 0.825 |
| 40 | 0.44 |
| 40.6 | 0.313 |
| 41.8 | 0.241 |
| 44.3 | 0.14 |
| 45.5 | 0.12 |
| 46.9 | 0.14 |
| 47.9 | 0.221 |
| 48.7 | 0.312 |
| 49.5 | 0.342 |
| 50 | 0.353 |
Curve 5
Temperature K: 77
Wavelength Range, μm: 19.2-50.0
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Source for Curve 5
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 414, curve 5. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 5
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 19.2 | 0.116 |
| 19.6 | 0.136 |
| 20.1 | 0.147 |
| 20.8 | 0.147 |
| 21.2 | 0.174 |
| 22.1 | 0.492 |
| 22.6 | 0.666 |
| 23 | 0.591 |
| 23.3 | 0.708 |
| 23.7 | 0.774 |
| 23.8 | 0.684 |
| 24 | 0.621 |
| 24.2 | 0.509 |
| 24.3 | 0.338 |
| 24.5 | 0.328 |
| 25.0 | 0.287 |
| 25.5 | 0.452 |
| 25.9 | 0.64 |
| 26.1 | 0.551 |
| 26.4 | 0.506 |
| 27.0 | 0.529 |
| 27.9 | 0.392 |
| 28.3 | 0.376 |
| 28.7 | 0.311 |
| 29.1 | 0.286 |
| 29.5 | 0.291 |
| 29.9 | 0.279 |
| 30.7 | 0.331 |
| 31.6 | 0.397 |
| 32.1 | 0.507 |
| 32.6 | 0.79 |
| 33.0 | 0.886 |
| 33.4 | 0.917 |
| 34.0 | 0.925 |
| 35.1 | 0.914 |
| 36.4 | 0.935 |
| 37.8 | 0.985 |
| 38.4 | 0.979 |
| 38.8 | 0.74 |
| 39.4 | 0.371 |
| 40.1 | 0.238 |
| 42 | 0.139 |
| 43.7 | 0.087 |
| 44.8 | 0.074 |
| 46.1 | 0.093 |
| 47.9 | 0.221 |
| 48.7 | 0.312 |
| 49.5 | 0.342 |
| 50.0 | 0.353 |
Curve 6
Temperature K: 4.2
Wavelength Range, μm: 19.2-50.0
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Source for Curve 6
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 414, curve 6. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 6
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 19.2 | 0.116 |
| 19.6 | 0.136 |
| 20.1 | 0.147 |
| 20.8 | 0.147 |
| 21.2 | 0.174 |
| 22.1 | 0.492 |
| 22.6 | 0.666 |
| 23.0 | 0.591 |
| 23.3 | 0.708 |
| 23.7 | 0.774 |
| 23.8 | 0.684 |
| 24.0 | 0.621 |
| 24.2 | 0.509 |
| 24.3 | 0.388 |
| 24.5 | 0.328 |
| 25.2 | 0.287 |
| 25.0 | 0.452 |
| 25.5 | 0.64 |
| 25.9 | 0.551 |
| 26.1 | 0.486 |
| 26.6 | 0.504 |
| 26.9 | 0.327 |
| 28.0 | 0.266 |
| 28.8 | 0.249 |
| 29.6 | 0.23 |
| 30.1 | 0.282 |
| 30.4 | 0.316 |
| 31.6 | 0.34 |
| 32.5 | 0.747 |
| 32.9 | 0.876 |
| 33.2 | 0.909 |
| 33.8 | 0.923 |
| 35 | 0.915 |
| 36.5 | 0.933 |
| 37.8 | 0.985 |
| 38.4 | 0.979 |
| 38.8 | 0.74 |
| 39.1 | 0.337 |
| 39.5 | 0.23 |
| 40.5 | 0.163 |
| 44.2 | 0.071 |
| 44.9 | 0.058 |
| 46.0 | 0.076 |
| 47.1 | 0.155 |
| 47.9 | 0.221 |
| 48.7 | 0.312 |
| 49.5 | 0.342 |
| 50 | 0.353 |
Curve 1
Temperature K: 373
Wavelength Range, μm: 9.86-21.4
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Irtran 2 from Eastman Kodak Co. (1 mm thick); microcrystalline, hot-pressed compact; data extracted from smooth curve.
Source for Curve 1
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 452, curve 3. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 1
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 9.86 | 0.087 |
| 11.1 | 0.141 |
| 11.7 | 0.141 |
| 12.2 | 0.166 |
| 13.1 | 0.302 |
| 13.8 | 0.425 |
| 14.3 | 0.76 |
| 14.7 | 0.825 |
| 15.4 | 0.831 |
| 16.1 | 0.867 |
| 17.9 | 0.871 |
| 21.4 | 0.855 |
Curve 2
Temperature K: 77
Wavelength Range, μm: 3.01-122
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Similar to the above specimen and conditions.
Source for Curve 2
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 452, curve 4. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 2
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 3.01 | 0.16 |
| 3.48 | 0.134 |
| 4.29 | 0.11 |
| 5.26 | 0.099 |
| 5.98 | 0.109 |
| 6.61 | 0.091 |
| 6.85 | 0.091 |
| 7.4 | 0.104 |
| 9.86 | 0.091 |
| 11.0 | 0.087 |
| 11.6 | 0.119 |
| 12.9 | 0.111 |
| 13.8 | 0.144 |
| 14.2 | 0.173 |
| 14.5 | 0.233 |
| 14.8 | 0.374 |
| 15.1 | 0.824 |
| 15.5 | 0.461 |
| 15.7 | 0.856 |
| 17.3 | 0.89 |
| 17.8 | 0.89 |
| 18.2 | 0.871 |
| 18.9 | 0.561 |
| 19.5 | 0.839 |
| 21.3 | 0.91 |
| 26.5 | 0.906 |
| 27.8 | 0.978 |
| 28.0 | 0.957 |
| 28.4 | 0.922 |
| 31.0 | 0.102 |
| 32.6 | 0.072 |
| 34.1 | 0.124 |
| 35.9 | 0.124 |
| 36.5 | 0.163 |
| 37.8 | 0.343 |
| 43.5 | 0.516 |
| 45.8 | 0.728 |
| 52.7 | 0.759 |
| 59.6 | 0.713 |
| 62.9 | 0.699 |
| 67.6 | 0.649 |
| 70.1 | 0.637 |
| 74.8 | 0.597 |
| 81.8 | 0.537 |
| 86.7 | 0.548 |
| 107 | 0.488 |
| 110 | 0.398 |
| 122.0 | 0.386 |
Curve 3
Temperature K: 4.2
Wavelength Range, μm: 45.4-126
Geometry θ': 0°
Composition (weight percent), Specifications, and Remarks: Similar to the above specimen and conditions.
Source for Curve 3
Data originally published at 10.1364/AO.5.001911. Tabulated data extracted from Y. S. Touloukian and D. P. DeWitt, *Thermal Radiative Properties: Nonmetallic solids*, Thermophysical Properties of Matter - The TPRC Data Series, Volume 8, IFI/Plenum, New York, 1972; table 452, curve 5. Digital version served at EKHI (https://thermomat.ehu.eus/ekhi).
Data Table for Curve 3
| Wavelength / 𝜇m | Emittance / |
|---|---|
| 45.4 | 0.731 |
| 47.4 | 0.731 |
| 50.9 | 0.696 |
| 56.0 | 0.683 |
| 62.4 | 0.545 |
| 66.2 | 0.431 |
| 70.3 | 0.334 |
| 83 | 0.245 |
| 89.9 | 0.245 |
| 95.1 | 0.195 |
| 126.0 | 0.195 |