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
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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 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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Digital Demodulation Method and Application of a PWM-Excited Differential Self-Inductive Displacement Transducer [PDF]
SensorsAccurate measurement of spool displacement is essential for achieving high-performance closed-loop control and condition monitoring in hydraulic systems. However, conventional inductive displacement transducers typically rely on sinusoidal excitation and
Hui Guo +3 more
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Spectral Demodulation of Mixed-Linewidth FBG Sensor Networks Using Cloud-Based Deep Learning for Land Monitoring [PDF]
SensorsFiber Bragg grating (FBG) sensing systems face significant challenges in resolving overlapping spectral signatures when multiple sensors operate within limited wavelength ranges, severely limiting sensor density and network scalability.
Michael Augustine Arockiyadoss +6 more
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Fiber Optic Sensor of Axial Strain and Dynamic Transverse Force Based on Intensity Demodulation [PDF]
SensorsThis paper presents a fiber-optic sensor with intensity demodulation for simultaneous measurement of dynamic transverse force and axial strain. The sensor uses a Sagnac loop filter with a polarization-maintaining photonic crystal fiber (PM-PCF) that is ...
Cezary Kaczmarek, Malgorzata Detka
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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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Displacement Self-Sensing Active Magnetic Bearing Drives—An Overview [PDF]
SensorsDisplacement self-sensing active magnetic bearings (AMBs) have garnered significant attention from both academia and industry for their potential to reduce cost, enable system integration, and enhance reliability.
Yiling Yang +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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Equivalent Self-Noise Suppression of Distributed Hydroacoustic Sensing System Using SDM Signals Based on Multi-Core Fiber [PDF]
SensorsTo address the demand of equivalent self-noise suppression in a distributed hydroacoustic sensing system, this study proposes a method to enhance the acoustic sensitivity and signal-to-noise ratio (SNR) using space division multiplexed (SDM) technology ...
Jiabei Wang +7 more
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