Digital Signal Processing Reference
In-Depth Information
Block of metal
250
ο
T
=
300
ο
T
=
350
ο
T
=
400
ο
T
=
Temperature field at
x
=
x
′
x
=
x
′
Heat
(a)
x
Resistive strip
1 V
+−
(b)
Figure 2-3
Examples of scalar fields: (a) temperature; (b) voltage.
P
1
n
1
P
2
n
2
Figure 2-4
Example of a vector field: fluid velocity.
A flux plot can replace vectors with a system of flux lines that are created in
accordance with the following rules:
1. The transverse density of the flux lines agrees with the magnitudes of the
vectors. So, in Figure 2-5b, the velocity of the fluid is slower near the pipe
wall, necessitating that the flux lines be drawn farther apart than in the
middle, where the fluid flow is faster.
2. The direction of the flux lines must agree with the direction of the vectors.
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