Results 11 to 20 of about 15,818,813 (324)
Sharing a common origin between the rotational and linear doppler effects [PDF]
Laser and Photonics Reviews, 2017 The well-known linear Doppler effect arises from the linear motion between source and observer, while the less well-known rotational Doppler effect arises from the rotational motion.
Allen +40 more
core +3 more sources
Superlight inverse Doppler effect [PDF]
Nature Physics, 2018 It has long been thought1 that the inverse Doppler frequency shift of light2–13 is impossible in homogeneous systems with a positive refractive index.
Xihang Shi +7 more
semanticscholar +4 more sources
Optics Express, 2020 Recently, spatiotemporally modulated metamaterial has been theoretically demonstrated for the design of Doppler cloak, a technique used to cloak the motion of moving objects from the observer by compensating for the Doppler shift.
Baiyang Liu +5 more
semanticscholar +3 more sources
Doppler effect and micro‐Doppler effect of vortex‐electromagnetic‐wave‐based radar
IET Radar, Sonar and Navigation, 2020 The vortex electromagnetic (EM) wave carrying orbital angular momentum (OAM) has attracted much attention in radar applications. Aimed at the moving target detection application of vortex EM waves, the Doppler effect and the micro-Doppler (m-D) effect ...
Ying Luo +4 more
semanticscholar +3 more sources
The Doppler effect and similar triangles
Results in Physics, 2019 The Euclidean version of Doppler effect will be explained using the properties of similar triangles. These properties will serve to explain the relationship between frequencies of propagated wavefronts, number of wavefronts and the time of emitting and ...
Shukri Klinaku, Valbone Berisha
semanticscholar +3 more sources
On Ultrasonic MTI Measurement of Velocity Profiles in Blood-Flow [PDF]
Modeling, Identification and Control, 1981 A theoretical analysis of Doppler frequency estimators proposed to be used in ultrasonic MTI measurements of velocity profiles in blood flow, is given. The estimators give an output in form of a single analogue voltage and the relation of the output to ...
Bjørn A.J. Angelsen +1 more
doaj +1 more source
Aircraft Detection Using Phase-Sensitive Optical-Fiber OTDR
Sensors, 2021 Aircraft detection plays a vital role in aviation management and safe operation in the aviation system. Phase-Sensitive Optical Time Domain Reflectometry (Φ-OTDR) technology is a prevailing sensing method in geophysics research, structure inspection ...
Yunpeng Cai +4 more
doaj +1 more source
Phase-Induced Frequency Conversion and Doppler Effect With Time-Modulated Metasurfaces [PDF]
IEEE Transactions on Antennas and Propagation, 2020 Metasurfaces consisting of electrically thin and densely packed planar arrays of subwavelength elements enable an unprecedented control of the impinging electromagnetic fields.
D. Ramaccia +4 more
semanticscholar +1 more source
Sensors, 2021 Connected objects are deployed all over the world. Thus, they are contributing to improving communications. In urban areas, technological challenges are gradually being overcome, and advances in this area are exponential.
Laurent Ferrier +3 more
doaj +1 more source
Rotational object detection at noncoaxial light incidence based on the rotational Doppler effect.
Optics Express, 2022 The rotational Doppler effect (RDE) of optical vortex which can be used to detect the rotation speed, has become a well-known phenomenon and a hot topic of research in recent years.
Song Qiu +4 more
semanticscholar +1 more source