Pyrometer- Handbook - Contika

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20 Illustration 9: Emissivity of Metals emissivity modifiers non-metals Emissivity in % area of oxidized metals shiny metals Wavelength in µm Smooth and shiny metal surfaces reflect light strongly, their reflection coefficient is high, and their emission coefficient is low. A hot object has a high reflection coefficient and if it is close to where a temperature reading needs to be taken (for example, a furnace crown), it can affect the value of that reading. Therefore, smooth metal surfaces are the most difficult objects to measure in pyrometry. Emissivity modifiers, such as black lacquer or adhering plastic film, improve the emissivity of metals at low temperatures. Lacquer or plastic film have a high and known emissivity and assume the temperature of the metal surface. The non-metal group includes organic materials, such as food stuffs, wood or paper, as well as ceramics or fire clay. The emissivity of non-metals rises with increasing wavelength. Generally speaking, from a certain wavelength, the emissivity is nearly constant. With dark materials this begins in the visible spectrum, but with light coloured materials it is above 4 µm. Pyrometer Handbook
Emissivity in % Penetrable materials like glass, quartz, water, plastics, gases and flames show their own unique emissivity. Emissivity in % Pyrometer Handbook Fire Clay Wavelength in µm Wavelength in µm penetrable materials Glass Illustration 10: Emissivity of non-metals Illustration 11: Emissivity of glass (qualitatively) 21
Page 1: Pyrometer- Handbook Non-Contact The
Page 4 and 5: 2 Publication Data © Copyright IMP
Page 6 and 7: 4 Pyrometer Handbook
Page 8 and 9: Pyrometer Handbook
Page 10 and 11: 8 Illustration 2: Modern pyrometer
Page 12 and 13: 10 on temperatures on material no s
Page 14 and 15: 12 Newton Herschel Planck, Wien, St
Page 16 and 17: Illustration 5: Wien´s Law 14 Temp
Page 18 and 19: 16 reflection Illustration 7: Refle
Page 20 and 21: 18 grey body real radiation body Il
Page 24 and 25: 22 emissivity of glass On the one h
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Page 30 and 31: 28 silicon InGaAs Germanium Lead Su
Page 32 and 33: 30 Illustration 14: spot size diagr
Page 34 and 35: Illustration 16: Construction of a
Page 36 and 37: Illustration 17: structure of a 2-c
Page 38 and 39: 36 non-luminous flames 4-colour pyr
Page 40 and 41: 38 mathematical functions digital c
Page 42 and 43: 40 Illustration 21: colour presenta
Page 44 and 45: 42 confined spaces • Strong elect
Page 46 and 47: 44 through the lens sighting pilot
Page 48 and 49: Illustration 27: calibration body 4
Page 50 and 51: 48 spherical error airgap achromat
Page 52 and 53: Illustration 29: sources of interfe
Page 54 and 55: 52 dust, smoke transparent objects
Page 56 and 57: 54 ceramic tubes scanning optics Fl
Page 58 and 59: 56 calibrators digital converters g
Page 60 and 61: 58 /9/ Gerthsen, Kneser, Vogel: Phy
Page 62 and 63: 60 Table 1: Emissivity of various m
Page 64 and 65: 62 Application Comments 2-colour Py
Page 66 and 67: 64 calibration calibration body car
Page 68 and 69: 66 maximum value storage unit maxim
Page 70 and 71: 68 shutter spectrum spectral range
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70 Pyrometer Handbook
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72 data storage unit 66 daylight 25
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74 non-metals 19, 64 non-luminous f
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Pyrometer- Handbook - Contika

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