Quick reference guide to infrared thermometer …

infrared theoryCalibrationInfrared thermometersBlackbody theory Planck s LawDescribes the amount of spectral radiance emitted by a perfect blackbody at a given temperature, wavelength and solid s Displacement LawShows the peak wavelength for a given temperature (as predicted by Planck s Law).Planck s Law and Wien s Displacement Law 1e+0081e+0071e+0061e+0051e+0041e+0031e+0 021e+0011e+0001e-0010 2 4 6 8 10 12 14 16 18 20 Wavelength ( m)Spectral radiance [W(m sr)]T = 5000 CT = 1000 CT = 500 CT = 200 CT = 100 CT = 23 CT = -50 CPlanck s Law for various temperaturesWien s Displacement Law8-14 m band. The 8 14 is the spectral band used for most handheld infrared LawShows the total irradiance in the entire electro-magnetic constantsNameSymbolValueFirst radiation constant for spectral radiance 042 759 e8 W m4m-2sr -1 Second radiation 7752 e4 m KWien Wavelength Displacement Law constant (Third radiation constant) 7685 e3 m KStefan-Boltzmann 400 e-8 Wm-2 K-4 Sakuma Hattori Equation (Planckian Form)The Sakuma-Hattori Equation is used to approximate Planck s Law for instruments with non-finite bandwidth.

radiance Infrared theory Calibration Infrared thermometers Blackbody theory Planck’s Law Describes the amount of spectral radiance emitted by a perfect blackbody at a given temperature,

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