Apr 7, 2012 ... [Incropera et.al.] Thermal radiation is energy ... Fiber optics. References I. Frank P
. Incropera, David P. Dewitt, Theodore L. Bergman, Adrianne.
Optical Temperature Measurement Jaakko Yli-Luukko AUTO3160 Optics
7.4.2012
Jaakko Yli-Luukko (AUTO3160 Optics)
Optical Temperature Measurement
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Outline
1
Radiation
2
Optical pyrometers
3
Infrared thermometer
4
Thermography
5
Fiber optics
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Radiation
Blackbody radiation [Incropera et.al.] Thermal radiation is energy emitted by matter that is at a nonzero temperature. Stefan-Bolzmann law defines the upper limit of emissive power. Eb = σTs4
(1)
Where Eb is the emissive power per area [W/m2 ], Ts is the absolute temperature of the surface [K] and σ is the Stefan-Boltzmann constant (σ = 5, 670 · 10−8 W/m2 K4 ). For real surface the equation will be: E = εσTs4
(2)
Where ε is the emissivity of the surface (0 ≤ ε ≤ 1). Jaakko Yli-Luukko (AUTO3160 Optics)
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Optical pyrometers
Optical pyrometer
Example product: http://www.pyrometer.com/Pyro_Optical.html
Jaakko Yli-Luukko (AUTO3160 Optics)
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Infrared thermometer
Infrared thermometer
Example product: Fluke 62 Accuracy ± 1,5 % of reading. Fixed emissivity at 0,95 Measurement range −30◦ C to +500◦ C http://www.fluke.com/fluke/usen/Electrical-Test-Tools/ Thermometers/Fluke-62.htm?PID=56096
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Thermography
Thermography
Thermal imaging and thermal video Infared radiation range 9 – 14 µm Cooled and uncooled image detectors Products: http://www.flir.com/cs/emea/en/view/?id=42243 Jaakko Yli-Luukko (AUTO3160 Optics)
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Fiber optics
Fiber optics Dielectric No electromagnetic disturbance Transmission cable or sensor Different types http://www.wikid.eu/index.php/Fiber_optic_sensing http://www.sks.fi/tuotteet/kuituoptinen_mittausperiaate_ soveltuvuus http://www.electronics-cooling.com/1997/01/ temperature-measurement-using-optical-fibers/ http://en.wikipedia.org/wiki/Distributed_temperature_sensing http://en.wikipedia.org/wiki/Raman_scattering
Jaakko Yli-Luukko (AUTO3160 Optics)
Optical Temperature Measurement
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Fiber optics
References I
Frank P. Incropera, David P. Dewitt, Theodore L. Bergman, Adrianne S. Lavine Fundamentals of Heat and Mass Transfer Wikipedia http://en.wikipedia.org/wiki/Thermography http://en.wikipedia.org/wiki/Infrared_camera Wikid The Industrial Design Engineering Wiki http://www.wikid.eu/index.php/Fiber_optic_sensing
