Fig. 10

Comparison of time series in different frequency ranges, between PbCl₂ and the capacitive electrode. Time series a, c, and e are measured by the PbCl₂ electrode, and time series b, d, and f are measured by the capacitive electrode. The sample rate of curves a and b is 24 kHz with a 0.1-s recording length; the sample rate of curves c and d is 2400 Hz with a 1-s recording length; and the sample rate of curves e and f is 150 Hz with a 1-s recording length. The two types of electrodes appear the same when the sample rate is 24 kHz or 2400 Hz; there is an obvious difference when the sample rate is 150 Hz