Results 11 to 20 of about 2,219 (213)
Asymmetric propagation using enhanced self-demodulation in a chirped phononic crystal [PDF]
AIP Advances, 2016 Asymmetric propagation of acoustic waves is theoretically reported in a chirped phononic crystal made of the combination of two different nonlinear solids.
A. Cebrecos +5 more
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Self-demodulation effect on subharmonic response of ultrasound contrast agent [PDF]
SPIE Proceedings, 2012 In this work the use of the self-demodulation (S-D) signal as a mean of microbubble excitation at the subharmonic (SH) frequency to enhance the SH emission of ultrasound contrast agent (UCA) is studied. SH emission from the UCA is of interest since it is
Bosch, J.G. +6 more
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A 70 GHz 10.2 mW self-demodulator for OOK modulation in 65-nm CMOS technology [PDF]
IEEE Custom Integrated Circuits Conference 2010, 2010 A 70.86 to 79.29 GHz low-power self-demodulator for on-off-keying (OOK) modulation is realized in TSMC 65-nm CMOS technology. By using a frequency-sweeping injection-locked oscillator (IJLO), the OOK modulated 70 GHz signal is demodulated by itself in a ...
Baltus, P.G.M. +4 more
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High Frequency Response Current Self-Demodulation Method for Sensorless Control of Interior Permanent Magnet Synchronous Motor [PDF]
IEEE Access, 2021 In the sensorless control, high frequency (HF) rotating sinusoidal voltage injection method requires the position error compensation algorithms to eliminate the side effect of system delay.
Wenzhen Li +3 more
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Self-Demodulation of Pulsed Carriers [PDF]
The Journal of the Acoustical Society of America, 1971 Nonlinear effects cause demodulation of a pulsed carrier such that a signal proportional to the second time derivative of the square of the pulse envelope develops in the insonified medium. Several different types of pulse envelopes, i.e., rectangular, triangular, and trapezoidal, were utilized to modulate a 455-kHz carrier.
B. A. Davy, T. G. Muir, E. L. Hixson
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Subwavelength Acoustic Vortex Beams Using Self-Demodulation [PDF]
Physical Review Applied, 2021 [EN] Acoustic vortices with subwavelength dimensions and tunable topological charge are theoretically and experimentally synthesized at distances far beyond the Rayleigh diffraction length of the source, using self-demodulation. A dual helical acoustic source is used to generate two primary confocal vortex beams at different frequencies and different ...
Noé Jiménez +4 more
openaire +2 more sources
Applied SciencesWith the development of acoustic simulation methods in recent decades, it has become feasible to simulate the sound pressure distribution of loudspeakers before actually setting physical speakers and measuring the sound field.
Yuting Geng +3 more
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Asymmetric Acoustic Propagation of Wave Packets Via the Self-Demodulation Effect [PDF]
Physical Review Letters, 2015 This article presents the experimental characterization of nonreciprocal elastic wave transmission in a single-mode elastic waveguide. This asymmetric system is obtained by coupling a selection layer with a conversion layer: the selection component is provided by a phononic crystal, while the conversion is achieved by a nonlinear self-demodulation ...
Devaux, Thibaut +3 more
openaire +3 more sources
High Precision Estimation of Laser FM-Noise Using RF Quadrature Demodulation Techniques
IEEE Access, 2022 We report on a technique that uses RF quadrature demodulation to measure laser FM-noise based on a delayed self-heterodyne setup. The measurement is self-referencing and the FM-noise can be measured with high precision over a sufficiently long duration ...
Sean P. O'duill, Liam P. Barry
doaj +1 more source
, 2012 As a person, always fascinated with the presence of physics in the daily life challenges, let me share this
Ebrahimi Poorfaez, Telli
core +10 more sources