Distortion and high‐frequency generation due to nonlinear propagation of short ultrasonic pulses from a plane circular piston

1992 ◽  
Vol 92 (3) ◽  
pp. 1699-1705 ◽  
Author(s):  
Andrew C. Baker ◽  
Victor F. Humphrey
Keyword(s):  
High Frequency ◽  
Nonlinear Propagation ◽  
Frequency Generation

High Frequency Generation Based-On Nonlinear Micro Ring Resonator for Frequency Band Enhancement

2014 ◽  
Vol 979 ◽  
pp. 508-511
Author(s):  
Pongputhai Udomariyasap ◽  
Suthichai Noppanakeepong ◽  
Nithiroth Pornsuwancharoen
Keyword(s):  
Channel Capacity ◽  
Optical Communication ◽  
High Frequency ◽  
Ring Resonator ◽  
Ring Resonators ◽  
Small Device ◽  
Specific Frequency ◽  
Frequency Generation ◽  
Resonator System ◽  
Signal Filter

Propose the simulation of THz carrier frequencies using the small device and a Gaussian beam propagating within the device system. We found that the generated output power with the high frequency can be achieved. This consisted of a serial nonlinear micro ring resonator system for generating pulse and signal filter by Add/Drop filter, a technology optical communication by the micro ring resonator which generates the THz frequency multiple, whereas channel capacity in term of multi frequency bands can be provided by optical Add/Drop multiplexing. The increase in the number of channel capacity can be obtained by the increase in frequency density, while the security was introduced by the specific frequency filter, which was operated by the central operator. The optical micro ring resonators for THz frequency generation and enhancement are reviewed. The advantage of proposed system can be implemented by using the simultaneous optical communication system.

scholarly journals Fluoropolymer surface coatings to control droplets in microfluidic devices

Lab on a Chip ◽  
2014 ◽  
Vol 14 (11) ◽  
pp. 1834-1841 ◽  
Author(s):  
Carson T. Riche ◽  
Chuchu Zhang ◽  
Malancha Gupta ◽  
Noah Malmstadt
Keyword(s):  
High Frequency ◽  
Microfluidic Devices ◽  
Surface Coatings ◽  
Frequency Generation

Vapor deposited fluoropolymer coatings enabled extraction-induced merging of droplets and high frequency generation of droplets within PDMS microfluidic devices.

High frequency generation of coupled GHI and DNI based on clustered Dynamic Paths

Solar Energy ◽  
2018 ◽  
Vol 159 ◽  
pp. 453-457 ◽  
Author(s):  
Carlos F. Peruchena ◽  
Miguel Larrañeta ◽  
Manuel Blanco ◽  
Ana Bernardos
Keyword(s):  
High Frequency ◽  
Frequency Generation

Nonlinear propagation of high-frequency plasma waves in a magnetized plasma

1977 ◽  
Vol 18 (2) ◽  
pp. 249-256 ◽  
Author(s):  
P. K. Shukla
Keyword(s):  
High Frequency ◽  
Nonlinear Effects ◽  
Plasma Waves ◽  
Electron Plasma ◽  
Magnetized Plasma ◽  
Nonlinear Propagation ◽  
Arbitrary Angle ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
Density Perturbations

We study nonlinear effects associated with large amplitude electron plasma waves propagating at an arbitrary angle to the external magnetic field. It is shown that the nonlinear coupling of high-frequency plasma waves with static density perturbations leads to a convective instability. The growth length of the latter is obtained. The evolution of the wave electric field is also investigated.

scholarly journals Construction of an Omnidirectional Parametric Loudspeaker Consisting in a Spherical Distribution of Ultrasound Transducers

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4317 ◽  
Author(s):  
Marc Arnela ◽  
Oriol Guasch ◽  
Patricia Sánchez-Martín ◽  
Joan Camps ◽  
Rosa Alsina-Pagès ◽  
...  
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Nonlinear Propagation ◽  
Ultrasound Transducers ◽  
Frequency Range ◽  
Carrier Wave ◽  
Sound Sources ◽  
Low Frequencies ◽  
Structural Assembly ◽  
Chamber Measurements

Omnidirectional sound sources are needed to perform a large variety of tests in acoustics. Typically, they consist of conventional speaker drivers arranged in a dodecahedron. However, the directivity of the speaker drivers sharpens with frequency, which induces an intense decrease of the sound pressure levels at the edges of the dodechaedron. In this work, the problem is mitigated by building an Omnidirectional Parametric Loudspeaker (OPL), which contains hundreds of small ultrasound transducers set on a sphere. Each transducer emits an ultrasonic carrier wave modulated by an audible signal. Thanks to nonlinear propagation, the air itself demodulates the signal bringing it back to the audible range. The construction of an OPL prototype is challenging. The structure has been built by 3D-printing a set of pieces that conform to the sphere. Each piece contains the exact location of the transducers, which are aligned in parallels to facilitate the structural assembly and the wiring. The performance of the OPL has been tested in an anechoic chamber. Measurements show that the OPL has a good omnidirectional behavior for most frequencies. It clearly improves the directivity of dodechaedral sources in the high frequency range, but performs worse at low frequencies.

High-frequency generation in two coupled semiconductor superlattices

2013 ◽  
Vol 222 (10) ◽  
pp. 2559-2570 ◽  
Author(s):  
Satpal Matharu ◽  
Feodor V. Kusmartsev ◽  
Alexander G. Balanov
Keyword(s):  
High Frequency ◽  
Semiconductor Superlattices ◽  
Frequency Generation ◽  
Coupled Semiconductor
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