Figure 2
From: Atmospheric pressure air microplasma current time series for true random bit generation
Analysis of current signal collected from the atmospheric pressure air microplasma (APAMP) system: (a) Typical sample of current time series at a rate of 10 MS/s along with the noise floor, (b) Fast Fourier transform (FFT) of the current and noise signals obtained with a digital Tektronix TBS2104 oscilloscope (sampled at 500 MS/s), (c) Autocorrelation plot of a sample of current time series, (d) Probability distribution functions (PDF) estimate of current time series samples of 100 kpts in size collected at the rates of 10, 50 and 100 MS/s (the height of each bar is the relative number of observations), (3) Normal probability plots of the samples in (c) (in dots) aligned with the theoretical normal distribution (dashed lines); the solid thick lines connect the first and third quartiles of the data.
