Is it worth learning the Planckâs law to use a blackbody?
- For any given wavelength, the Radiance level is an increasing function of the temperature,
- For any given temperature, the Spectral Radiance curve reaches a maximum which wavelength can be easily calculated from the easy-to-remember Wienâs law
Example: a blackbody at 800K (i.e. 527Â°C approx.) emits its maximum radiation at about 3.6 Âµm, i.e. in the MWIR spectral range.