How to use Doppler in a sentence

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Sentence Examples Synth notes bob, bend and warble, producing a strange, droning, Doppler effect, whizzing past the listener like vehicles on a Tron superhighway. A blood pressure cuff and hand-held Doppler stethoscope are required to perform this test. The Doppler effect is a change in the frequency of sound waves caused by moving objects. In colour flow sonography, pulsed Doppler signals are used to produce the images. The sound reached a crescendo, then trailed off to the south in a quickly fading Doppler echo. Laser Doppler velocimetry has been successfully applied to the measurement of speeds of everything from blood corpuscles to rolled steel. In countries outside the United States, Doppler flow velocimetry is used to monitor uteroplacental blood flow. The diagnosis can be confirmed by investigations such as MRI scans, Doppler ultrasonography, and venography. A venous Doppler study confirmed venous thrombosis of the deep femoral vein. Now, physicists in England have demonstrated a topsy-turvy Doppler shift in which a radio wave's frequency rises as the source recedes. For Doppler cooling, we need another detail from quantum mechanics, and a bit of relativity. Down on the ground, 162 Doppler radar stations around the United States read atmospheric conditions as close to earth as possible. Knowledge of Doppler flow velocimetry of the foetal MCA may assist in perinatal diagnosis and management of complicated pregnancies. This causes a periodic Doppler shift of the spectrum of one or both members of the pair. That pulsars are part of a binary system is indicated by Doppler shifts in the pulse period and the change in arrival time of the pulse. A smaller, portable machine called a Doppler uses ultrasound for intermittent monitoring. Basically the Doppler effect is that pitch increases the closer something gets to you, and it decreases the further away it gets. The instructor had been navigating over the mountains with Doppler and had the coordinates of the airport plugged into the system. The tracing shown below demonstrates the pulsatile velocities of red blood cells over time as shown using Doppler ultrasound technology. After acquiring Doppler sounds at the palmar arch, the RNFA occludes the radial artery flow. Show More Sentences Horseshoe bats have a special kind of echolocation, which allows them to use the Doppler shift to detect the flutter of moth wings. This determination assumes the variation of the redshift is indeed a Doppler effect due to motion of the star. Current systems rely on Doppler radar with a dish antenna that rotates to scan the surrounding terrain. By analogy, the electromagnetic radiation emitted by a moving object also exhibits the Doppler effect. I am looking for any information on the Doppler radars and the effects of microwave radiation. In 1842 Doppler proved that the colour of a luminous body, like the pitch or note of a sounding body, must be changed by velocity of approach or recession. Just as we can't tell if we'll hit a microburst and plunge down 300 feet unless we have Doppler radar, we also don't know what the EM environment is unless we measure it. This leads to some very interesting consequences, such as the reversal of the Doppler shift for radiation, and the reversal of Cherenkov radiation. On each orbit, the planets pull the star slightly, which can be detected by the Doppler effect. The inverse Doppler effect is not something you can hear, but understanding it could one day lead to important advances in optics and communications equipment. A relative contraindication is the presence of carotid bruits, which should be evaluated by Doppler ultrasonography before proceeding with massage. In heterodyne SLDV, a scanned laser beam incident on the vibrating test surface undergoes a Doppler radial frequency shift proportional to the instantaneous velocity. A reduced Doppler shift also enhances the effectiveness of chaff and decoys, which should allow the aircraft to break lock and hide in ground clutter. In the astronomical setting, the Doppler effect applies to light. A colour Doppler ultrasound scan done two weeks later confirmed the lesion to be of vascular origin with multiple draining channels and arterialisation of veins. Doppler was incorrect regarding light being a longitudinal wave. In fact Fresnel had already published his theory that light was a transverse wave but, although Doppler had read Fresnel's work, he did not accept it. Electrocardiography, stress electrocardiography, echocardiography and cardiac scan with dipyridamole test, as well as carotid Doppler ultrasonography, showed no abnormalities. In the type of ultrasound examination called Doppler velocimetry, a hand-held transducer uses sound waves to measure patterns of fetal blood flow. Regional cerebral blood flow was monitored by laser Doppler flowmetry with the use of a flexible probe over the skull as described earlier. Show More Sentences In interpreting radar images, an isodop is a line of equal Doppler velocity, and an isoecho is a line of equal radar reflectivity. Doppler shift depends upon whether the radar configuration is active or passive. Vehicles and weather moving parallel to the radar beam produce the maximum Doppler frequency shift. This signal processing is similar to that used in speed detecting Doppler radar. The Doppler effect is only able to determine the relative speed of the target along the line of sight from the radar to the target. Radial movement is usually linked with Doppler frequency to produce a lock signal that cannot be produced by radar jamming signals. Within hours they realized that, because of the Doppler effect, they could pinpoint where the satellite was along its orbit. They then receive echoes back at the finely tuned frequency range by taking advantage of the Doppler shift of their motion in flight. The Doppler shift of the returning echoes yields information relating to the motion and location of the bat's prey. These bats must deal with changes in the Doppler shift due to changes in their flight speed. The Vector Measuring Current Meter and the Acoustic Doppler Current Profiler are both used to measure current. A radar gun fires microwave pulses at a car and measures the Doppler shift of the reflected signal to calculate its velocity. Redshift results from the Doppler effect, the same phenomenon that causes the siren on a fire truck to drop in pitch as the truck passes. Color and power Doppler are limited in their ability to evaluate perfusion of the renal cortex. The unit comes with either a bidirectional 4-MHz or 8-MHz frequency continuous wave Doppler transducer. Application of the Doppler ultrasound bloodflow detector in supraclavicular brachial plexus block. Carotid Doppler ultrasonography showed complete occlusion of the right common carotid artery and internal carotid artery. Deltex Medical Group has introduced its initial open access Oesophageal Doppler Monitoring e-learning courses. At 26 weeks and 3 days, on clinical suspicion of oligohydramnios, ultrasound with Doppler was performed. Tenders are invited for A Laser Doppler Velocimeter System Is Used For Real-Time In-Situ Velocity Or Simultaneous Velocity Measurements. Show More Sentences In January 2003, a Nortek acoustic Doppler velocimeter was placed in the middle of a seeded mussel raft at a 5-m depth for a period of 5 days. Doppler ultrasonography verified an acute nonocclusive deep vein thrombosis in his left superficial femoral vein. Thus classically there is decreased color and Doppler flow to the ovary, but with detorsion, this pattern is reversed. Myocardial functions can be evaluated using tissue Doppler parameters as well as conventional echocardiographic methods. The mortality benefit is probably directly tied to the reduction in cesareans associated with Doppler imaging. Equipment such as a Doppler machine is used to assess circulatory problems which may be contributing to patient symptoms. Use of Doppler ultrasonography in the early detection of NOMI has not been reported. The subject of the contract is a LIDAR wind instrument based on the Doppler shift and the use of a pulsed laser. Lu et al proposed an algorithm known as D-Sync, leverages the Doppler shift in underwater environment to do time synchronization. It leverages the property of the Doppler shift, which is the change of a wave as its source moves relative to the observer. Doppler shift caused by skin acceleration was recorded during each procedure. He begins with special relativity, including Lorentz transformations and the Doppler shift. Gestures result in very small Doppler shifts, and WiSee detects those shifts and translates them into commands. Colour flow and Doppler features permit identification of vascular, ductular, and cystic structures. An alternative method is to use a fetal heart rate monitor with a Doppler ultrasound probe to detect the fetal heart. Despite the acceptance of the Doppler redshift described by Hubble's law, there are problems with this model. Relying on an ultrasteady radio signal from Huygens to Cassini, the Doppler Wind Experiment will measure the strength of Titan's wind. One is the assessment of the vascularity of masses and the other is the identification of vague breast masses using power Doppler vocal fremitus. Laser Doppler flowmetry is a non-invasive method of measuring blood flow by using the Doppler shift in laser light scattered by moving erythrocytes. Then researchers measured finger blood flow with laser Doppler flowmetry, a non-invasive technique for gauging blood circulation on a microscopic level. Show More Sentences Acoustic Doppler Current Profiler, Doppler Current Meter, Acoustic Doppler Profiler or Acoustic Doppler Velocimeter, applies the Doppler effect to measure flow velocity. They are based on the first 500 participants in the Combined Transcranial and Extracranial Venous Doppler Evaluation study, which began last April. Hubble's law and the Doppler effect, observed in nearby stars, suggested that stars moving away shift toward red, and the faster the stars move away, the greater the shift. That's the Doppler effect, and it also occurs for electromagnetic radiation, enabling police to catch speeders with radar guns and astronomers to determine distances to stars. Therefore all spectral changes over a cycle must be known, including Doppler shifts due to trap rotation, and this is a difficult experimental task. Keck was able to measure tiny changes in the star's spectrum, called Doppler shifts, caused by the telltale tug exerted by the orbiting planet on the star. Further, the product segment of blood flow measurement devices market has been segmented into ultrasonic Doppler, laser Doppler and electromagnetic. In particular, many consider the significance of Vesto Melvin Slipher's 1912 astrometric research at the Lowell Observatory on Doppler shift in a spiral nebula. The width of a spectral line reflects velocity dispersion of the gas and shows up due to the Doppler effect caused by a distribution of the velocities of gas molecules. Since the positrons are thermalized, the Doppler broadening measurements provide information about the momentum distributions of electrons at the annihilation site. Due to the Doppler effect, this radial velocity change induces a shift of the star's spectrum towards longer wavelengths as it moves away and a blueshift as it approaches. Karwe and Sernas reported the application of laser Doppler anemometry to measure velocity distributions in a twin-screw extruder using model fluids. This introduces FM modulation which degrades Doppler performance. The Doppler frequency shift for active radar is as follows, where. As an example, Moving Target Indication can interact with Doppler to produce signal cancellation at certain radial velocities, which degrades performance. Commissioning of the high performance computing system has provided opportunity to assimilate satellite radiance, Doppler Weather Radar, OCEANSAT data etc. If the object is moving either toward or away from the transmitter, there is a slight equivalent change in the frequency of the radio waves, caused by the Doppler effect. The vehicle navigation relies on a satellite-based GPS receiver, a fluxgate compass, a 3-axis inclinometer, a pressure sensor, and a Doppler velocity log. Examples from Classical Literature Recent spectroscopic observations of the nebul applying the principle of Doppler have revealed high velocities of rotation. Angle, strength and Doppler movement were computed to find course and distance. And I noticed that the waves of sound were under a slight Doppler effect. Galderisi M, Severino S, Cicala S, Caso P The usefulness of pulsed tissue Doppler for the clinical assessment of right ventricular function. Find more words! 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