Essay On Doppler Effect

1274 Words3 Pages
bulb-icon

Recommended: Doppler effect introduction paragraph

Doppler Effect
Basics:
The Doppler effect is named after the Austrian physicist Christian Doppler, who in 1842 proposed it, "it is the change in frequency of a wave for an observer moving relative to its source". It is mainly heard when a vehicle with a siren approaches the observer. The received frequency is higher during the approach compared to the emmited frequency, the same at the instant of passing the observer, and lowers as it gets further away. When the source of the waves is moving toward the observer, each successive wave crest is emitted closer to the observer than the previous wave. Because of this each wave takes slightly less time to reach the observer than the one before it. Therefore the time between the successive wave crests arrival to the observer is reduced. This ends up causing an increase in the frequency. While the waves are travelling, the distance between successive wave fronts is reduced so the waves get closer together (bunch). Likewise, If the source of waves is moving away from the observer, each wave is emitted from a position that is further from the observer than the wave before it, so the arrival time between successive waves is increased. This ends up causing a decrease in the frequency. The distance between successive wave fronts is increased, so the waves further apart (spread out).
Applications:
Medical imaging and blood flow measurement, Flow measurement, Velocity profile measurement, Satellite communication, Underwater acoustics, Audio, Vibration measurement, Astronomy, Temperture measurement, doppler radar and sirens.

Radar:
Radar is short for "radio detection and ranging". A transmitter sends pulses of high frequency radio waves then an echo from the radar shows up on a monitor and sho...

... middle of paper ...

...common in the winter. A radar also has more trouble detecting in the rain because of the airs constanly changing refractive index. Another trouble for the radar is also when a temperature inversion is existing which causes the radar screen to be filled with clutter and sploges. So weather radar can detect for valuable observations of the atmosphere, but sometimes the picture is foggy.
Bibliography/References:
http://en.wikipedia.org/wiki/Weather_radar http://hyperphysics.phy-astr.gsu.edu/hbase/sound/radar.html http://www.straightdope.com/columns/read/2227/how-do-radar-guns-work http://www.infoplease.com/cig/weather/radar-scanning-skies.html#ixzz2yXGyzwHO http://www.weatherquestions.com/What_is_a_temperature_inversion.htm http://www.everythingweather.com/weather-radar/principles.shtml Weather Radar: Principles and Advanced Applications- Peter Meischner Springer, 2004

Show More
Related

  • tornado

    1334 Words  | 3 Pages

    Supercells tend to be the least common but have the potential to be the most severe. Supercells are isolated from other thunderstorms and can impact area weather from as far away as 32 miles. A squall line is a thunderstorm that forms alongside of a cold front. The squall line contains heavy precipitation, hail, constant lightning, strong straight-line winds, and potentially tornadoes. Strong straight-line winds usually occur when the squall line is in the shape of a bow echo (Wikipedia, 2014). The bow echoes develop within the summer months are commonly known as derechos.

    Read More

  • National Missile Defense (NMD) Research Paper

    3942 Words  | 8 Pages

    3. X-Band/Ground-Based Radars: These radar systems gather tracking information regarding the incoming warheads during the mid-course phase of the missile. This data is then sent to the BM/C2, which in turn is sent to the GBI for guidance to intercept the warhead.

    Read More

  • Pulse Wave Analysis Essay

    1900 Words  | 4 Pages

    This chapter provides some insight into pulse wave analysis and its relation to arterial diseases. The shape of the arterial pulse wave is an augmentation of the forward traveling wave with the reflected wave. The amount of wave reflection is dependent on the arterial wall properties such as arterial stiffness and is expressed in terms of Augmentation Index. This approach has been studied extensively using various measuring techniques, all of which have respective advantages and disadvantages. The purpose of PWA can be seen in the section describing the medical conditions that affect the wave shape. The discussion is included to assist the reader in understanding the purpose of pulse wave analysis.

    Read More

  • Essay On Stroop Effect

    766 Words  | 2 Pages

    For examining the influence of age and gender on the Stroop effect, the experimenter adopted the Stroop paradigm. In Stroop paradigm there are three: neutral or control, congruent and incongruent groups. Neutral / control group will receive stimuli in which only the text or colors are presented (van Maanen L, van Rijn H& Borst JP, 2009). When the color of the word and the text of the word refer to the same color (for example the word "red" printed in red) is a congruent stimulus. In Incongruent stimulus, the color of the word and color of the text differ (for example the word "red" printed in blue).

    Read More

  • British Women In Ww2 Essay

    1780 Words  | 4 Pages

    Reading, Gwem. "Radar Operator in WW2." Letter. 8 Nov. 2003. N.p.: n.p., n.d. N. pag. BBC WW2 People's War. Web. 23 Apr. 2014.

    Read More

  • Oscilloscope Essay

    1446 Words  | 3 Pages

    The word oscilloscope is a word that combines from Latin and Greek language. The first part “oscillare” derives from the Latin words meaning to swing backwards and forwards. The second part comes from Classical Greek “skopein” means to observe, aim at, examine, from which developed the Latin ending “scopium”, which has been used to form names for instruments that enable the eye or ear to make observation.

    Read More

  • Radio Synthesis Essay

    1372 Words  | 3 Pages

    Radio is device that use technology of using radio waves to transfer information, such as sound, by using the properties of electromagnetic energy waves transmitted through space, such as their phase, amplitude, frequency, or pulse width. If radio waves passing an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be get back into its original form.

    Read More

  • The World War II: Air War

    1189 Words  | 3 Pages

    "Radar during World War II." - GHN: IEEE Global History Network. N.p., n.d. Web. 16 Feb. 2014. .

    Read More

  • The Physics of the Sound Wave and its Effects on the Human Ear

    1339 Words  | 3 Pages

    Could you imagine living in a world without sound? It would be enormously different from the world that we know. Our primary form of inter-human communication would be based on visual or tactile imagery. Our sense of perception would be changed. Telecommunication would be different. We would not have the pleasure of music or the soothing sounds of nature. Sound has had an immense impact on our world. This essay will explore the unseen world of sound waves and how humans perceive them.

    Read More

  • Arrhythmias Essay

    773 Words  | 2 Pages

    This condition can be treated various ways depending on “the type and frequency of arrhythmias, associated symptoms…, and the presence of structural heart disease” (Cleveland Clinic, 2014). Some patients may not need treatment at all, since they show not symptoms, since sometimes this condition can be naturally eliminated over the first year of life, but may still be required to have regular schedule appointments with the physician so the patients can be monitored. If symptoms are prevalent, the different treatment methods include a pacemaker, defibrillator, surgery, and medicine.

    Read More

  • History Essay

    1115 Words  | 3 Pages

    ...yone wants. Radar is also frequently used by law enforcement for the detection of speeds to see if passing motorists are speeding.

    Read More

  • Career in Ultrasound

    2029 Words  | 5 Pages

    Ultrasounds use the same concepts that allow sonar on boats to see the bottom of the o...

    Read More

  • Radio

    1500 Words  | 3 Pages

    Radio-wave technology is one of the most important technologies used by man. It has forever changed the United States and the world, and will continue to do so in the future. Radio has been a communications medium, a recreational device, and many other things to us. When British physicist James Clerk Maxwell published his theory of electromagnetic waves in 1873, he probably never could have envisioned the sorts of things that would come of such a principle. His theory mainly had to do with light waves, but fifteen years later, a German physicist named Heinrich Hertz was able to electrically generate MaxwellÕs ÒraysÓ in his lab. The discovery of these amazing properties, the later invention of a working wireless radio, and the resulting technology have been instrumental to AmericaÕs move into the Information Age. The invention of radio is commonly credited to Guglielmo Marconi, who, starting in 1895, developed the first ÒwirelessÓ radio transmitter and receiver. Working at home with no support from his father, but plenty from his mother, Marconi improved upon the experiments and equipment of Hertz and others working on radio transmission. He created a better radio wave detector or cohere and connected it to an early type of antenna. With the help of his brothers and some of the neighborhood boys he was able to send wireless telegraph messages over short distances. By 1899 he had established a wireless communications link between England and France that had the ability to operate under any weather conditions. He had sent trans-Atlantic messages by late 1901, and later won the Nobel prize for physics in 1909. Radio works in a very complicated way, but hereÕs a more simple explanation than youÕll get from most books: Electromagnetic waves of different wavelengths are produced by the transmitter, and modulations within each wavelength are adjusted to carry ÒencodedÓ information. The receiver, tuned to read the frequency the transmitter is sending on, then takes the encoded information (carried within the wave modulations), and translates it back into the sensory input originally transmitted. Many of the men who pioneered radio had designs for it. Marconi saw it as the best communication system and envisioned instant world-wide communication through the air. David Sarnoff ( later the head of RCA and NBC) had a vision of Òa radio receiver in every homeÓ in 1916, although the real potential of radio wasnÕt realized until after World War I.

    Read More

  • Signal Detection Theory Essay

    1406 Words  | 3 Pages

    Signal detection theory is introduced by mathematicians and engineer in 1950 . It started to evolve from the developing electronics communication.

    Read More

  • Arts And Crafts Essay

    715 Words  | 2 Pages

    observation is a skiil neded on the science field , so the most effective solution that scientist had for their student to obtain it , is by taking paitnting and drawing classes . all the typed of observation can be useful for scien whwtehr is vius, oral or tacticale (Root-Bernstein & Root-Bernstein, 1999) one comman exmle , physisttius who has a musical backrogound are more abler to use sthoscopes from those did has have any (Mangione &

    Read More

More about Essay On Doppler Effect

Open Document