On Cuba, diplomats, ultrasound, and intermodulation distortion
Sign Up to like & getrecommendations! Published in 2019 at "Computers in biology and medicine"
DOI: 10.1016/j.compbiomed.2018.11.012
Abstract: This paper analyzes how ultrasounds could have unintentionally led to the AP news recordings of metallic sounds heard by diplomats in Cuba. Beginning with screen shots of the acoustic spectral plots from the AP news,… read more here.
Keywords: cuba diplomats; intermodulation distortion; diplomats ultrasound; intermodulation ... See more keywords
Detecting cracks due to steel corrosion in reinforced cement mortar using intermodulation generation of ultrasonic waves
Sign Up to like & getrecommendations! Published in 2021 at "Construction and Building Materials"
DOI: 10.1016/j.conbuildmat.2021.122915
Abstract: Abstract It has been studied the sensitivity of the technique of intermodulation of ultrasonic waves to detect different damage states of concrete due to embedded steel corrosion. Accelerated corrosion tests have been conducted on reinforced… read more here.
Keywords: cement mortar; ultrasonic waves; corrosion; intermodulation ... See more keywords
Modelling of the passive intermodulation in coaxial connectors with broadband signal excitation
Sign Up to like & getrecommendations! Published in 2019 at "Electronics Letters"
DOI: 10.1049/el.2019.0705
Abstract: Theoretical calculations and simulations are introduced to explain the passive intermodulation power level rise (PLR) in coaxial connectors with broadband signal excitation for the third-order intermodulation products. An equivalent model is developed to describe the… read more here.
Keywords: coaxial connectors; connectors broadband; passive intermodulation; broadband signal ... See more keywords
Prediction and observation of intermodulation sidebands from anharmonic phonons in NaBr
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review B"
DOI: 10.1103/physrevb.103.134302
Abstract: A quantum Langevin model, like models from optomechanics, was developed for phonons. It predicts intermodulation phonon sidebands (IPSs) in anharmonic crystals. Ab initio calculations of anharmonic phonons in rock-salt NaBr showed these spectral features as… read more here.
Keywords: observation intermodulation; anharmonic phonons; prediction observation; phonons nabr ... See more keywords
Two-Tone Excited Hybrid-Coupler-Based Intermodulation Generator for High-Isolation Wireless Sensing Applications
Sign Up to like & getrecommendations! Published in 2020 at "IEEE Access"
DOI: 10.1109/access.2020.3041354
Abstract: An intermodulation generator is designed and presented with integration of a hybrid coupler and two identical Schottky diodes (i.e., D1 and D2). The connection polarities of D1 and D2 to the direct and coupled ports… read more here.
Keywords: intermodulation; hybrid coupler; two tone; intermodulation generator ... See more keywords
Triboelectric Energy Generation for Modulating the Intermodulation of Quartz Oscillators in a Transmitter-to-Receiver System
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Access"
DOI: 10.1109/access.2021.3137454
Abstract: A quartz oscillator has a stable frequency that can be tuned by applying a voltage across the quartz crystal. This study applied a triboelectric generator (TEG) as mechanical stimuli on the input voltage of a… read more here.
Keywords: system; intermodulation; voltage; receiver system ... See more keywords
A Low Power 5.8-GHz ISM-Band Intermodulation Radar System for Target Motion Discrimination
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Sensors Journal"
DOI: 10.1109/jsen.2019.2926189
Abstract: This paper discusses the design and test of an intermodulation radar receiver and a nonlinear tag operating in the 5.8-GHz industrial, scientific, and medical (ISM) band. To discriminate reflections of the target-generated 3rd-order intermodulation frequencies… read more here.
Keywords: ism band; intermodulation radar; ghz; target ... See more keywords
Utilizing Passive Intermodulation Response of Frequency-Modulated Continuous-Wave Signal for Target Identification and Mapping
Sign Up to like & getrecommendations! Published in 2021 at "IEEE Sensors Journal"
DOI: 10.1109/jsen.2021.3084205
Abstract: In this paper, a passive-intermodulation-based tracking system working with a frequency-modulated continuous-wave (FMCW) is proposed for target identification and localization. Signals in the microwave range are chosen to realize ranging purposes for the benefits of… read more here.
Keywords: passive intermodulation; modulated continuous; target; frequency modulated ... See more keywords
Broadband Dual-Port Intermodulation Generator for Passive Intermodulation Measurements
Sign Up to like & getrecommendations! Published in 2017 at "IEEE Microwave and Wireless Components Letters"
DOI: 10.1109/lmwc.2017.2690857
Abstract: A dual-port tunable intermodulation (IM) generator is reported. This IM generator employs a coupling network to distribute carrier waves and IM. The proposed coupling network is constructed by cascading four parallel-coupled directional couplers, while a… read more here.
Keywords: intermodulation generator; dual port; inline formula; intermodulation ... See more keywords
Compact Intermodulation Modulator for Phase Reference in Passive Intermodulation Measurements
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Transactions on Instrumentation and Measurement"
DOI: 10.1109/tim.2019.2943975
Abstract: In this article, a modular designed intermodulation (IM) modulator based on coherent nonlinearity superposition is demonstrated. A coherent combination network for two nonlinear sources (diodes) is composed, excited by a set of two-tone carriers, and… read more here.
Keywords: compact intermodulation; reference; modulator; intermodulation modulator ... See more keywords
Modeling of Passive Intermodulation With Electrical Contacts in Coaxial Connectors
Sign Up to like & getrecommendations! Published in 2018 at "IEEE Transactions on Microwave Theory and Techniques"
DOI: 10.1109/tmtt.2018.2838147
Abstract: Coaxial connectors are one of the main contributors to passive intermodulation (PIM) in radio frequency systems. Such systems exhibit nonlinear characteristics, especially as the transmission power is increased. In this paper, microscopic surface analysis and… read more here.
Keywords: intermodulation electrical; passive intermodulation; modeling passive; power ... See more keywords