Figure 7–2: A full period is 0.41 min (25 s), which corresponds to a frequency of 1/25 = 0.04
Hz.
7.2.1 Frequency of signal and noise
A chromatographic peak can also be expressed in terms of frequencies. The way to determine
this frequency is the same. The duration of the full peak is measured and expressed in Hz.
Figure 7–3: Frequency tells how often something happens: 1 peak in about 0.25 min (15 s),
f = 1/15 = 0.07 Hz
This is further illustrated by an overlay of the same chromatographic peak with a sine of 0.07 Hz
(
Figure 7–4: Overlay of a chromatographic peak with 0.07 Hz sine (Page 66)
).
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