How to calculate blackbody temperature from radiance band?

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SUMMARY

The discussion focuses on calculating blackbody temperature from radiance in a specific spectral band, particularly the 3-5 µm range. The formula provided, T=hc/{L*k *{ln{2h*c^2/(L^5*R)}+1}}, allows for the conversion of radiance (R) of 1000 W/m²/sr to a temperature of 666.6K. Key constants involved include the Boltzmann constant (k), Planck's constant (h), and the speed of light (c). The relationship between peak wavelength and temperature is also acknowledged, emphasizing the need for precise calculations when working with radiance over a band.

PREREQUISITES
  • Understanding of Planck's Law for blackbody radiation
  • Familiarity with the Boltzmann constant (k)
  • Knowledge of spectral bands, specifically the 3-5 µm range
  • Basic proficiency in logarithmic functions and their applications in physics
NEXT STEPS
  • Research the application of Planck's Law in calculating blackbody radiation
  • Study the derivation and implications of the formula T=hc/{L*k *{ln{2h*c^2/(L^5*R)}+1}}
  • Explore tools for simulating blackbody radiation and temperature calculations
  • Investigate the relationship between wavelength and temperature in blackbody radiation
USEFUL FOR

Physicists, engineers, and researchers involved in thermal radiation analysis, particularly those working with infrared spectroscopy and remote sensing applications.

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I know how to calculate blackbody radiance in a spectral band from a temperature by integrating (or summing) planks function.

How can I do the reverse? For example, I have a Radiance of 1000 W/m^2/sr in the 3-5um band, I'd like to be able to calculate 666.6K.
 
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T=hc/{L*k *{ln{2h*c^2/(L^5*R)}+1}}
the above formula is quoted in the reference given below;
L is wavelength ,k is Boltzmann constant, h and c are usual well known constant R is radiance...well i do not know details you have to search.

ref.-http://oceancolor.gsfc.nasa.gov/forum/oceancolor/topic_show.pl?tid=5478

off course the peak value of wavelength is also related with temp.
 
I did see that, and that gives the temperature for one wavelength.

My radiance is over a band.
For example, in a BB calculator, I can put in 666.6K, over the 3-5um band, and it will give me 1000 W/m^2/sr
How do I do the reverse? I have 1000 W/m^2/sr in the 3-5um and I want to calculate the temperature
 

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