Figure 3
Mean square energy fluctuation for an ideal cavity with central absorber integrated over a hemisphere (the second hemisphere is ignored because of the perfect back mirror) normalized to the perfect absorber from Figure 1. The spectral width describes a resonance covering a small wavelength range centered at λ=10 µm. Three background temperatures are shown: 290 K (blue), 800 K (green) and 1300 K (red). The detector temperature is 290 K.
