NASA uses radar to map the Earth and other planets, track satellites and space debris and help with things like docking and maneuvering. The military uses radio detection and ranging to detect enemy aircraft with pulses of short radio waves. Then there are meteorologists who use Doppler weather ...
We've seen that the echo of a sound can be used to determine how far away something is, and we've also seen that we can use the Doppler effect of the echo to determine how fast something is going. It is therefore possible to create a "sound radar," and that is exactly what sonar...
The wave nature of sound becomes apparent when a graph is drawn to show the changes in the concentration of air molecules at some point as the alternating pulses of compression and rarefaction pass that point. The graph for a single pure tone, such as that produced by a vibrating tuning for...
The Doppler effect describes the change in frequency or wavelength of a sound wave created by an object moving toward or away from an observer. Illustration:Charly Whisky. The ADCP affixed to the keel of a Saildrone unmanned surface vehicle (USV) emits a series of high-frequency pulses of sou...
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By understanding the signs of a tornado in the making, meteorologists can issue warnings and signals to areas that might soon become a little too familiar with one. Weather surveillance systems such as Doppler radars use a technology similar to echolocation that reflects pulses off water vapor in...
Reliability: If the correct flow meter has been selected for an application it can be expected to perform without error for many years. Frequently meters are sent in for servicing and recalibration that have been in the field for 10 sometimes 20 years continuous use. This reliability is largely...
The use of seatbelt elements to represent tendons and different combinations of sliprings allows the definition of complex paths, where each muscle is adjustable separately by individual activation curves [3]. This mechanism was implemented in the latest Total HUman Model for Safety (THUMS™) ...
After a mean round trip time \(\,\bar{T}\approx 300\,\mu s\), an ordered sequence of pulses returns to the first coupler and starts its journey again (see Fig. 1c). For any m round trips, the pulses arrive in the photodetectors at different arrival times as $${T}_{{\rm{...
The presence of normal pulses, normal Doppler, and normal capillary refill in the presence of a reduced bicruciate (dislocated) knee does not guarantee the absence of vascular injury. Serial physical examinations, ankle brachial indexes, and arteriogram all must be Treatment The current consensus ...