Results 21 to 30 of about 2,219 (213)
Acoustic Parametric Signal Generation for Underwater Communication
Sensors, 2018 This paper presents a study of different types of parametric signals with application to underwater acoustic communications. In all the signals, the carrier frequency is 200 kHz, which corresponds to the resonance frequency of the transducer under study ...
María Campo-Valera +6 more
doaj +1 more source
Sensors, 2020 There is an optical interference noise in the conventional Raman-based fiber-optics distributed sensing, which results in a poor temperature resolution performance. In addition, the traditional whole-fiber demodulation principle complicates the operation
Jian Li +6 more
doaj +1 more source
Photonics, 2023 We have established a novel method for quadrature signal construction in a semiconductor laser diode self-mixing interferometry system using two photodiodes and a beam splitter with a liquid crystal phase shifter (LCPS).
Yancheng Li +3 more
doaj +1 more source
Effect of Pulse Shaping on Subharmonic Aided Pressure Estimation In Vitro and In Vivo. [PDF]
, 2016 OBJECTIVES: Subharmonic imaging (SHI) is a technique that uses the nonlinear oscillations of microbubbles when exposed to ultrasound at high pressures transmitting at the fundamental frequency ie, f METHODS: Eight waveforms with different envelopes were ...
Dave, Jaydev K. +11 more
core +2 more sources
IEEE Photonics Journal, 2022 We demonstrate the use of a self-injection locked distributed feedback (DFB) diode laser for high-sensitivity detection of acoustic emission (AE) using a fiber-coil Fabry-Perot interferometer (FPI) sensor.
Farzia Karim +3 more
doaj +1 more source
Pulse propagation in a linear and nonlinear diatomic periodic chain: effects of acoustic frequency band-gap [PDF]
, 2009 One-dimensional nonlinear phononic crystals have been assembled from periodic diatomic chains of stainless steel cylinders alternated with Polytetrafluoroethylene spheres. This system allows dramatic changes of behavior (from linear to strongly nonlinear)
Daraio, C. +4 more
core +2 more sources
A Novel Scheme for Discrete and Secure LoRa Communications
Sensors, 2022 In this paper, we present a new LoRa transceiver scheme to ensure discrete communications secure from potential eavesdroppers by leveraging a simple and elegant spread spectrum philosophy.
Clément Demeslay +4 more
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BPSK Circuit Based on SDC Memristor
Micromachines, 2022 Digital communication based on memristors is a new field. The main principle is to construct a modulation and demodulation circuit by using the resistance variation characteristics of the memristor.
Ran Gao, Yiran Shen
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Microbubble Composition and Preparation for High-Frequency Contrast-Enhanced Ultrasound Imaging: In Vitro and in Vivo Evaluation [PDF]
, 2017 Although high-frequency ultrasound imaging is gaining attention in various applications, hardly any ultrasound contrast agents (UCAs) dedicated to such frequencies (>15 MHz) are available for contrast-enhanced ultrasound (CEUS) imaging.
Bosch, J.G. (Hans) +10 more
core +1 more source
A Self-Sensing Active Magnetic Bearing Based on a Direct Current Measurement Approach
Sensors, 2013 Active magnetic bearings (AMBs) have become a key technology in various industrial applications. Self-sensing AMBs provide an integrated sensorless solution for position estimation, consolidating the sensing and actuating functions into a single ...
Carel P. du Rand +2 more
doaj +1 more source