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| Figure 1. Time-frequency of plasma electrical signal. |
In this
laboratory session we have been working on graphical representation of
sinusoids are building an electrical signal of the first sample. This type of
information could not have been presented by Origin Pro, so we decided to use
Mathcad for drawing this graph. The output is presented in the figure 1, the
colors are showing the intensity of the particular frequency. From the graph we
can observe definitely the most intense colours are oscillating in the low
frequency region - below 100Hz. It is the base frequency. Second most intensive
frequency we can see is 4000 Hz. It is the high frequency component of the
signal. We can also notice that intensity of the signal is decreasing
approximately in the middle of the graph and is much higher at the beginning
and in the end.
