Difference between revisions of "Pulse"
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Pulse
</dt>
1. A variation of a quantity whose value is normally constant; this
variation is characterized by a rise and a decay, and has a finite duration.
</dd>
The word pulse normally refers to a variation in time; when the
variation is in some other dimensions, it should be so specified, such as
space pulse. This definition is so broad that it covers almost any transient
phenomenon. The only features common to all pulses are rise, finite duration,
and decay. It is necessary that the rise, duration, and decay be of a quantity
that is constant (not necessarily zero) for sometime before the pulse and has
the same constant value for some time afterwards. The quantity has a normally
constant value and is perturbed during the pulse. No relative time scale can
be assigned.
</dd>
2. Radar,
sense 2.
</dd>
3. The intermittent change in the shape of an artery due to an increase in
the tension of its walls following the contraction of the heart. The pulse is
usually counted at the wrist (radial pulse), but may be taken over any artery
that can be felt. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
