Planck early results
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Fig. 21


Examples of noise power spectra for the bolometers 143-5 (top), 545-2 (middle), and Dark1 (bottom). The first two have been calibrated in CMB temperature units, by using the calibration coefficients derived during the map making step. The last spectrum is in Watts. The central region shows a nearly white noise plateau, with a low frequency “1/f” component, and a high frequency cut-off due to the filtering of frequencies above the sampling frequency. At 143 GHz, the upturn due to the deconvolution of the (bolometer dependent) temporal transfer function is clearly seen (see details in Sect. 4.6).

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